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Copyright of Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Materials Engineering / Cailiao Gongcheng is the property of Journal of Materials Engineering Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Lithium-ion batteries (LIBs) will cause internal short-circuits and even induce thermal runaway when they are subjected to compression and impact loadings. It is of great significance to explore the influencing factors of battery failure under different mechanical abuses for the crashworthiness design of the cells. In this paper, taking cylindrical LIBs as the research object, the force-electrical-thermal responses of the cells under different compression/impact conditions were studied by using a self-made plane compression and local indentation experimental system. The experimental results were compared with the corresponding finite element (FE) ones, and there was in good agreement with each other. Based on the explicit nonlinear FE method, the effects of loading velocity, indenter shape, and indenter diameter on the failure behaviors and mechanical responses of LIBs were also discussed. It is shown that localized indentation is more likely to induce the failure of the cells compared with plane compression. The peak force significantly decreases with the decrease of the indenter diameter, and the failure displacement also decreases correspondingly. It is noted that the failure displacement increases with the increase of the impact velocity, however, the failure displacement will decrease gradually when the impact velocity is more than 15 m/s. These results will provide some guidance for the multi-objective optimal design and safety assessment of LIBs. [ABSTRACT FROM AUTHOR]

Saturated compressive strength is a key indicator to evaluate whether tunnel muck can be used to prepare manufactured aggregates. However, the existing testing methods for saturated compressive strength present problems such as complex sample preparation requirements, strict testing procedures, and long pretreatment time. The characteristics of tunnel muck such as irregular shape, different block sizes, and large changes in water content, make it unable to meet the requirement for rapid evaluation of mechanical property, which hinders the manufactured aggregate application process of tunnel muck. Therefore, it is urgent to carry out research on the rapid evaluation method of saturated compressive strength of tunnel muck. The performance characteristics of tunnel muck and the stipulations of different industries on the saturated compressive strength index of manufactured aggregate parent rock are analyzed. The correlation between saturated compressive strength of tunnel muck and its point load strength index is discussed from the standard level and research level. The feasibility of evaluating saturated compressive strength of tunnel muck based on point load strength index is demonstrated. By summing up the factors of the point load evaluation method, it is found that lithology, moisture content, specimen size and strength have significant impact on the prediction effect of point load. In practical engineering applications, it is necessary to focus on reducing the evaluation error rate. The conditions applicable to point load rapid test are given, that is, the thickness should be controlled at 35 ~ 60 mm, the width should be controlled at 40~60 mm, and the longest side should be controlled at 35~60 mm. Thus, the stability of the point load evaluation method is improved, which provides technical support for the green application of tunnel muck used for manufactured aggregate. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Mine Automation is the property of Industry & Mine Automation Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to find the cause of sunroof water leakage, this paper systematically studies three types of sunroof water leakage modes based on the bottom-mounted sunroof structure, including water leakage between the body and the roof seal strip, water leakage between the roof seal strip and the sunroof glass, water leakage over the guiding gutter. The result show that the sunroof water leakage are related to factors like the sunroof seal strip, the sunroof guiding gutter, the sunroof drain pipe, the body and the assembly. The sunroof water leakage can be effectively solved by improving the form of the roof seal strip, compression load performance, coordination with environmental components and joint quality, improving the layout, structure and water conductivity of the guiding gutter, improving the form, layout and displacement of the drainage pipe, improving the flanging size and surface quality of the body, optimizing the assembly environment, techniques and tooling positioning. [ABSTRACT FROM AUTHOR]

BACKGROUND: The problem of intervertebral disc injury and degeneration has been studied in many ways. Many studies have shown that intervertebral disc injury and degeneration is driven by mechanical loading factors. However, the potential relationship between common phenotypes of intervertebral disc injury and degeneration and mechanical loading factors has been rarely summarized. OBJECTIVE: To summarize the types of common structural abnormalities exhibited by intervertebral disc injury and degeneration in the published literature, and sum up the potential links to the types of mechanical loading that lead to these structural abnormalities in in vitro and ex vivo experimental studies. METHODS: Using the terms “intervertebral disc failure, intervertebral disc injury, mechanical load, mechanical factor, load factor, biomechanics” as Chinese and English key words in PubMed, CNKI, and WanFang databases, articles related to intervertebral disc injury degeneration and mechanical load factors were retrieved. Literature screening was performed according to the inclusion and exclusion criteria, and 88 articles were finally included. RESULTS AND CONCLUSION: (1) Common structural abnormalities of intervertebral discs include decreased intervertebral disc height, disc bulge, osteophyte formation, annulus fibrosus tear, intervertebral disc herniation or disc prolapse, endplate damage, Schmorl nodes and intervertebral disc calcification. Intervertebral discs are susceptible to mechanical load types such as compression, bending, axial rotation, and compound loads. (2) The compressive load mainly causes the decrease of the proteoglycan content and the water-binding ability of the intervertebral disc, leading to the decrease or swelling of the intervertebral disc and further damage and degeneration of the intervertebral disc. In addition, the excessive compressive load causes greater damage to the endplate. (3) Bending load and axial rotation load damage the annulus fibrosus more than the endplate, and prolonged or repeated bending loads can cause tearing of the fibrous annulus and herniation or prolapse of the intervertebral disc, while pure axial rotation loads can induce less damage to the intervertebral disc and only cause the tear of the annulus fibrosus. (4) However, when different load types act in combination, it is more likely to result in high stress on the disc and a greater risk of disc injury. (5) Injury and degeneration of the intervertebral disc present progressive structural damage, and early prevention and protection are particularly important in clinical practice. Future tissue engineering research can start with early repair of the intervertebral disc. [ABSTRACT FROM AUTHOR]

BACKGROUND: Few studies are comparing the biomechanical characteristics of three internal fixation techniques in the treatment of distal tibial fractures. OBJECTIVE: To compare the biomechanical properties of distal tibial fractures fixed by medial distal tibial plate, anterior-grade expert tibial nail and retrograde tibial nail. METHODS: Based on the CT data of a SAWBONES 4th generation artificial composite tibia model, a simulation model of distal tibia fracture (AO/ASIF 43-A3) was constructed by digital 3D reconstruction technology. On this basis, three internal fixation methods including locking plate of the medial tibia, expert grade intramedullary nail and retrograde tibial nail were simulated. Finite element analysis was carried out for three groups of implanted assembly models under axial compression and axial torsion loading conditions respectively, and the differences in stress distribution, stress peak value and fracture space displacement were compared among the three groups. RESULTS AND CONCLUSION: (1) When the three groups of internal fixators were loaded under two load conditions, the peak stress of the expert tibial nail group was 283.53 MPa at the unlocked main nail hole under the torsion condition. In the medial distal tibial plate group, the stress peak was located on the third screw, which was 913.07 MPa under the torsional condition. In the retrograde tibial nail group, the stress peak was at the second main nail hole under the torsion condition, which was 435.42 MPa. In the retrograde tibial nail group, the stress peak of the cortical bone around the main nail hole at the medial malleolus appeared under high axial compression condition, which was 55.34 MPa. (2) In terms of fracture gap micromovement, the expert tibial nail group had the highest tangential displacement in the four regions under axial compression load. The axial displacement of the four regions in the medial distal tibial plate group was the highest, and the maximum value was in the lateral region. The peak axial displacement of the expert tibial nail group and retrograde tibial nail group was located in the posterior region. (3) When the axial torsional load was loaded, the peak axial displacement of the medial distal tibial plate group and retrograde tibial nail group was in the lateral region, and the tangential displacement of the four regions in the retrograde tibial nail group was smaller than that in the medial distal tibial plate group and expert tibial nail group. (4) It is indicated that retrograde tibial nail has a biomechanical advantage over the medial distal tibial plate and expert tibial nail in distal tibial fractures in terms of fracture end fretting and internal fixation stress. [ABSTRACT FROM AUTHOR]

Copyright of Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Plastics Science & Technology / Suliao Ke-Ji is the property of Plastics Science & Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

BACKGROUND: The femoral neck system is a novel fixation device for unstable femoral neck fractures. OBJECTIVE: To compare and analyze the mechanical stability of three kinds of internal fixation in Pauwels III unstable femoral neck fractures by finite element method. METHODS: On the basis of the validated femoral finite element model (intact group), the model was cut to make a Pauwels III 70° unstable fracture of the femoral neck. Different internal fixation models were implanted to simulate clinical surgery. This study established femoral neck system fixation (model A), inverted triangular cannulated screw fixation (model B) and 4 diamond-shaped cannulated screw fixation (model C). All the nodes under the distal end of the femur were restrained for the three groups of models, and 700 N, 1 400 N and 2 100 N compressive loads were applied to the femoral head. Through calculation and analysis, the Von Mises stress distribution and deformation of each group of models were observed, and the mechanical stability of each group of models was compared. RESULTS AND CONCLUSION: (1) The maximum deformation of the three groups of models under various loads occurred in the femoral head. When compressed for 2 100 N, the deformation of model A was 2.06 mm less than that of intact group 2.17 mm, while the deformations of model B and model C were both higher than that of intact group, with the distributions of 2.39 mm and 2.33 mm. (2) Under various loads, the stress in model A group was also the smallest. Under 2 100 N, the stress peak in model A was 297.31 MPa, distributed at the joint position of anti-rotation screw and locking screw, while the stress peak in model B was 543.18 MPa, distributed at the fracture joint position of the third screw in the inverted triangle. However, the deformation and stress of model C were intermediate between model A and model B, and the maximum stress peak value was distributed at the bottom hollow of the cannulated screw fracture, reaching 315.61 MPa at 2 100 N. (3) The compressive stiffness and stress analysis of models of the three groups showed that model A < model C < model B. (4) It is concluded that the mechanical stability of femoral neck system for femoral neck fracture is better than that of three and four cannulated screws fixation, and it can effectively prevent femoral neck shortening. Femoral neck system is a recommended internal fixation method for unstable femoral neck fractures. [ABSTRACT FROM AUTHOR]

Copyright of Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to obtain the comprehensive compressive properties of cross-laminated timber (CLT), compressive strength tests were conducted on the CLT specimens made of spruce-pine-fir (SPF). The compressive strength, Poisson's ratio, and elastic modulus of CLT were calculated based on composite laminate plate theory, aiming to provide a reference for the mechanical properties testing of CLT. Nine CLT specimens with same dimensions were tested under axial compression to investigate the variation patterns of the ultimate bearing capacity, longitudinal strain, transverse strain, and Poisson's ratio. The theoretical bearing capacity of specimens was predicted according to the Chinese Standard for design of timber structures and verified with finite element modelling. The load-axial displacement curve showed a typical bifurcation characteristic, indicating that the specimens under axial pressure experienced elastic and elasto-plastic stages to failure, and the equivalent elastic modulus of SPF obtained by conversion was 10 011.57 MPa. The compressive strength and the Poisson's ratio were obtained as 35.16 MPa and 0.39, respectively. The theoretical calculated values generally fit the test results well. The simulated results in elastic stage were in good agreement with the test values. [ABSTRACT FROM AUTHOR]

Copyright of Chinese Journal of High Pressure Physics is the property of Chinese Journal of High Pressure Physics Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Northeast Petroleum University is the property of Journal of Northeast Petroleum University Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Coal Science & Technology (0253-2336) is the property of Coal Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to find the optimal loading system for large scale plate frame under the combined action of axial uniform pressure load alone and surface load, and to study the interaction relationship between loading system and plate frame structure, this paper simulates two types of plate frame and tooling connection forms of lap joint and welding, two types of single/dual actuator numbers, six types of actuator base sizes, establishes the computational model, and compares with the ideal axial uniform pressure load model in terms of structural response, failure mode and interaction between plate frame and tooling. It is found that for the studied plate frame structure, the lap joint connection with 400 mmx400 mm base size of double actuator is the closest to the ideal structural response, and the failure mode is the same under all working conditions, and the difference of stress response is between -2.69%~4.11%. x-axis displacement response difference between 1.32%~1.64%, z-axis displacement response difference between 2.49%~25.18%, and ultimate load capacity difference between -2.17%~0.69%. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Shanghai Jiao Tong University (1006-2467) is the property of Journal of Shanghai Jiao Tong University Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Railway Standard Design is the property of Railway Standard Design Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Coal Science & Technology (0253-2336) is the property of Coal Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Mechanical Engineering is the property of Editorial Board of China Mechanical Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Lubrication Engineering (0254-0150) is the property of Editorial Office of LUBRICATION ENGINEERING and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Architecture & Civil Engineering is the property of Chang'an Daxue Zazhishe and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The thermal compression experiment was carried out by Gleeble thermal simulation experimental machine with the experimental temperature of 950—1 100 ℃,the strain rate of 0.001—1 s-1,by analyzing the flow stress curves, the Arrhenius constitutive equation was established and revised, and the Arrhenius strain-compensation constitutive equation including deformation temperature, strain rate and responding variable was obtained. In order to verify the validity of the theoretical values calculated by the constitutive equation, the results show that the theoretical stress value calculated by the modified constitutive equation is in good agreement with the experiment data and has a high accuracy, the calculated theoretical values and the experimental data were compared, and the average error was analyzed with the correlation coefficient revalue of 0.967 and AARE value only of 7.35%.Furthermore, the critical strain model of dynamic recrystallization of Haynes 242 alloy was assisted based on the Zener-Hollomon parameter. By drawing the energy dissipation and the instability criterion diagrams, the hot processing map of Haynes242 alloy under different deformation was obtained, the influence of deformation parameters on microstructure evolution and optimum process parameters were revealed. [ABSTRACT FROM AUTHOR]

Copyright of Bulletin of the Chinese Ceramic Society is the property of Bulletin of the Chinese Ceramic Society Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Guangdong Architecture Civil Engineering is the property of Guangdong Architecture Civil Engineering Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of High Pressure Physics is the property of Chinese Journal of High Pressure Physics Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Hollow cubic, G7 and BCC porous Ti6A14V materials with cubic lattice as unit were fabricated by SLM processing. Their elastic moduli were all within the range of human natural bone. Static compression and tensile tests were carried out to study the compressive and tensile properties of porous materials. BCC structure showed better compressive and tensile strength compared with the other two. Due to the complexity of the porous implant workload, it is found that the G7 structure supported by tilting struts has a slow fatigue failure rate and performs better than the other two under dynamic compression loading by applying alternating loads to the porous materials with different lattice structures. In the analysis of fatigue failure, it is found that the fatigue crack source of SLM porous material mainly occurs near the pore inside the material. [ABSTRACT FROM AUTHOR]

In order to reduce the adverse effects of materials and manufacturing technology on the environment, it is of great practical significance to study the mechanical properties of wood-based sandwich cell structure to adapt to the rapid growth of reconstructed houses and prefabricated building sites. In this paper, three kinds of wood-based interlocking grid cell structures with the same structural form but different combined materials are designed and prepared. The static compression experiments are carried out, and the compression strength, mass load ratio and specific energy absorption characteristics are analyzed by theoretical analysis and numerical simulation. The results show that the mechanical properties of the three cell structures are higher than those of their combined materials, and they are light and high-strength materials. It can be concluded that the core layer of wood-based interlocking grid sandwich cell structure is the main body to bear the external force, the material of the panel plays an important role in the bearing capacity of the cell structure. [ABSTRACT FROM AUTHOR]

Copyright of Journal of South China University of Technology (Natural Science Edition) is the property of South China University of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Railway Science & Engineering is the property of Journal of Railway Science & Engineering Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Guangdong Architecture Civil Engineering is the property of Guangdong Architecture Civil Engineering Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of South China Normal University (Natural Science Edition) / Huanan Shifan Daxue Xuebao (Ziran Kexue Ban) is the property of Journal of South China Normal University (Natural Science Edition) Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Experimental Technology & Management is the property of Experimental Technology & Management Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Harbin Institute of Technology. Social Sciences Edition / Haerbin Gongye Daxue Xuebao. Shehui Kexue Ban is the property of Harbin Institute of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The self-balanced test pile method is gradually popularized due to its convenience and economy. However, few studies were focused on the conversion coefficient involved in the process of converting this method into the static load-displacement curve. Because the settlement on the pile top is affected by soil continuity, the displacement difference on the pile top of the self-balanced test pile and the static load pile were analyzed using the Mindlin′s formula based on the comparative study of the self-balanced test pile method and the traditional vertical compression static load test method of single pile. An equivalent conversion method to determine the bearing capacity of self-balanced test pile was proposed in order to improve the empirical formula. The rationality of the improved method was verified by indoor simulation test as well as pile foundation engineering test of a super high-rise building in Shenyang. It is found that the self-balance conversion method taking the soil continuity in to account can significantly reduced the fitting error of the load-displacement curve. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Architecture & Civil Engineering is the property of Chang'an Daxue Zazhishe and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Architecture & Civil Engineering is the property of Chang'an Daxue Zazhishe and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

BACKGROUND: With the rapid development of 3D printing technology in tissue engineering, a variety of scaffold materials prepared by 3D printing are widely used in mandibular defect repair. 3D printing technology brings new possibilities for mandibular defect repair. OBJECTIVE: The 3D bionic bone scaffold material was constructed by low-temperature 3D printing technology, and the internal structure of the scaffold was precisely controlled, and the mechanical properties of the scaffold were analyzed. METHODS: Under the same volume, by changing the interlacing angle of the printed scaffold wire harness and the wire harness, low-temperature 3D printing technology was used to print silk fibroin/type I collagen/hydroxyapatite scaffolds with different angles (30°, 45°, 90°) and polycaprolactone/hydroxyapatite scaffolds (a total of 6 sets of scaffolds). The uniaxial compression mechanics experiment was loaded to 6 groups of scaffolds at a compression rate of 0.5%/s, compressed to 30% strain to observe the relationship between stress and strain. The stress relaxation experiment was applied to the three printing angles of silk fibroin/collagen I/hydroxyapatite scaffolds at a compression rate of 0.5%/s at 10%, 20%, and 30% strain, and the relaxation retention time was 3 hours to observe the relationship between stress and time. In the creep experiment, the silk fibroin/collagen I/hydroxyapatite scaffold with an angle of 90° was compressed and printed at a constant pressure of 2.5, 3.75, and 5 kPa, and the creep retention time was 3 hours to observe the relationship between strain and time. RESULTS AND CONCLUSION: (1) Uniaxial compression mechanics experiment: The mechanical properties of 3D printed silk fibroin/type I collagen/ hydroxyapatite scaffold and polycaprolactone/hydroxyapatite scaffold compression showed that the 90° scaffold had higher Young’s modulus than the 30° and 45° scaffolds under the same compression strain. (2) Stress relaxation experiment: When the compression rate, compression strain and compression angle were constant, the stress of silk fibroin/type I collagen/hydroxyapatite scaffold decreased rapidly with the extension of relaxation time, then slowly decreased. With the extension of relaxation time, the stress of the scaffold decreased rapidly in the beginning time (within 1 600 seconds), and in the later period (3 700 seconds). When the compression rate and compression strain were kept constant, the initial and stable stress values of silk fibroin/type I collagen/hydroxyapatite scaffolds with 90° printing angle were higher than those of scaffolds with 30° and 45° printing angle. When the compression rate and compression angle were constant, the initial and stable stress values of silk fibroin/type I collagen/hydroxyapatite scaffolds increased with the increase of compression strain. (3) Creep test: With the extension of creep time, the strain of 90° silk fibroin/type I collagen / hydroxyapatite scaffolds increased rapidly in the initial stage (within 500 seconds), then increased slowly, and finally leveled off. The strain range of the scaffolds was 35% to 55% at 2.5 kPa, and 43% to 57% at 3.75 kPa. The strain of the scaffold ranged from 45% to 57% under 5 kPa. [ABSTRACT FROM AUTHOR]

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