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The SMPC (Shape Memory Polymer Composite) is used for space deployable structuredue to their excellent properties. In this paper, the space deployable antenna was designed, whichincludes the design of the basic configuration, the antenna substrate, the SMPC hinge and its location.The modal of the hinge was studied with finite element software ABAQUS. The hinges with differentthickness were analyzed and compared. The modal of single piece antenna was calculated. Thevibration types and natural frequencies of the single piece antenna in connection are obtained. Theeffects of different hinge structures on the overall mode and the natural frequencies of the hinge werestudied. The influence of hinge location on the natural frequencies of deployable antenna was alsostudied. The mode of four pieces antenna in unfolding was calculated, the main vibration types wereobtained, and the natural frequencies were analyzed and compared with that of the single pieceantenna. In unfolding, the natural frequencies of the four pieces antenna are lower than that of thesingle piece one.

Finite Element Method (FEM) is one of the most useful techniques to analyze problems in metal forming process because of this technique can reduce cost and time in die design and trial step [1]. This research is aimed to predict the optimal parameters in order to eliminate cracks and wrinkles on automotive deep drawing product “Shell Bar RR Impact RH/LH”. The material was made from high strength steel JSC440W sheet with thickness 1.8 mm. The parameters that had been investigated were blank holder force (BHF) and drawbead restraining force (DBRF). In order to simplify the process, punch and die in the simulation were assumed to be a rigid body, which neglected the small effect of elastic deformation. The material properties assumed to be anisotropic, behaved according to the constitutive equation of power law and deformed elastic-viscoplastic, which followed Barlat 3 components yield function. Most of the defects such as cracks and wrinkles were found during the processes on the parts. In the past, the practical productions were performed by trial and error, which involved high production cost, long lead time and wasted materials. From the results, when decreased blank holder force to 30 tons, cracks on the part were removed but wrinkles had a tendency to increase in part area because of this part is the asymmetrical shape. Finally, applying about drawbead restraining force at 154.49 and 99.75 N/mm could improve product quality. In conclusion, by using the simulation technique, the production quality and performance had been improved.

In this study, the forging operations of gear has been modeled. This gear is a part which is manufactured with the help of hot forging industry for reduce the cost. The authors propose to reduce the initial billet volume of AISI 4340 steel for the forged through process optimization using the Finite Element (FE)method. The object of this research was to predict the effect of several parameters, such as effective stress, effective plastic strain, temperature and die contact, on the forming of the gear, utilizing computer simulation and experimental results. For this purpose, Solidworks CAD and Simufact Forming FE software were used for the modeling and analysis of the forging process. The billet volume and the preform design were predefined in order to reduce scrap by using preform type C. The experimental results showed that the initial billet volume was reduced at 32 %, which compared favorably with the simulation result of a 40 % reduction. The maximum preforming force of simulation result was diferent with the experiment result at 18 along with the maximum finishing force of simulation result was different with the experiment result at 11 %. It was also found that the effective stress decreased with increasing the temperature, and the press force decreased when the initial billet volume was decreased, which resulted in a decrease of effective plastic strain as well.

The formation of chips in cutting processes is characterised by large deformations and large configurational changes and therefore challenges established modeling techniques. To overcome these difficulties, the particle finite element method (PFEM) combines the benefits of discrete modeling techniques with methods based on continuum mechanics. In this work an outline of the PFEM, as well as an explanation of the finite element formulation are provided. The impact of the boundary detection on the structural integrity is studied. The numerical examples include a tensile test as well as cutting simulations. The paper is concluded by a comparison of cutting forces with analytical results.

The strength and tightness of flange joints will be weaker due to the temperature fluctuations. There exists no mature calculation procedure that can accounts for the temperature fluctuations’ effect on the performance of flanged joint. Based on the finite element simulation of a flanged joint under emergency stop and drive condition using ANSYS, the strength integrity and sealing performance of it are evaluated according to code JB4732-2005. The results show that stress of every component increases after experiencing an emergency stop and drive, flange deflection is more serious, resulting in integrity and tightness failure and can’t meet the sealing requirements. Repeatedly stop and drive will lead to discontinuity and alternating loads for the flanged joints, which will increase the leakage trend.

Capacitor banks are used widely in many different regions. Since seismic requirements are different from place to place, custom design is needed. Finite element simulation is used to help designers in this paper. All mechanical response of capacitor bank in different load cases are calculated. With these simulation support, custom design of capacitor banks is done for different regions safely and effectively.

In finite element numerical simulation, the calculating results of geometrical models with different mesh density tend to have obvious differences, especially when material damage and fracture are considered. In order to study the mesh dependency of the finite element calculation, models of a projectile penetrating into the target with different mesh densities are constructed by using LS-DYNA. A nonlocal approach is investigated and the results without and with MAT_NONLOCAL are compared. It is found that the nonlocal model with a variable characteristic length parameter provides a relatively accurate and stable result, and the calculation cost can be reduced.

For many recycled plastics, materials with different rheological properties and melting points are usually mixed together, and can not be separated. For this situation, the block of die-plate holes can be regarded as an important factor that must be taken into consideration in pelleting process. This paper discusses pelleting process in die-plate and reasons of die hole’s blocking. Finite element simulation is calculated to analyze the relationship between operation factors of pelleting process and blocking situation of die holes. Furthermore, block self-healing is realized by changing the velocity of polymer-melt in die-hole.

Small punch test (SPT) is a miniature sample test technique which can evaluate in-service material properties with an almost non-destructive method. Since the deformation behavior of the small punch specimen is complicated, finite element simulation embedded with Gurson-Tvergaard (GTN) model is adopted to simulate elastic-plastic behaviour until fracture. Choosing the proper GTN parameters is crucial for the small punch simulation, which directly influence the precision of load-displacement curve obtained from simulation. In this paper, load-displacement curve is divided into five stages and the parameters identification process is done by adjusting the simulation curve with experimental load-displacement curve in different stages which controlled by separately parameters. The results show that the parameters determined based on this criterion are not unique. In order to validate the reliability of this method, specimen’s minimum thickness of cross-section after fracture was introduced as an extra criterion which turned out to be feasible. Load-displacement curves cannot serve as the only criterion to verify the GTN parameters.

The creep behavior of 2.25Cr-1Mo-0.25V ferritic steel was investigated using a set of physically-based creep damage constitutive equations. The material constants were determined according to the creep experimental data, using an efficient genetic algorithm. The user-defined subroutine for creep damage evolution was developed based on the commercial finite element software ANSYS and its user programmable features (UPFs), and the numerical simulation of the stress distribution and the damage evolution of the semi V-type notched specimen during creep were studied. The results showed that the genetic algorithm is a very efficient optimization approach for the parameter identification of the creep damage constitutive equations, and finite element simulation based on continuum damage mechanics can be used to analyze and predict the creep damage evolution under multi-axial stress states.

As a newly developed engineering structure, bucket foundation breakwater is adapted to soft soil. In this paper, the general-purpose finite element analysis package ABAQUS is employed to conduct three-dimensional numerical analyses on bucket foundation breakwater. Then earth pressure variation on bucket foundation is carried out under different loads of horizontal displacement. Through analysis it obtains the laws of the earth pressure on the meeting-wave side and the back-wave side of bucket foundation breakwater. This will provide the reference and the evidence of preliminary theory for the stability research and practical engineering application of bucket foundation breakwater.

The two problems restrict the development of directly buried pipeline installation without compensation technology in the heating engineering.Therefore, the intensity of elbow itself is analyzed to optimize the elbow .A new model of elbow is provided .This paper uses ANSYS finite element analysis software to establish a new type of elbow model.We compare and analyze the stress of ordinary elbow which add block and do not add block ; two different types which both have the same wall thickness and new type elbow which have 5 different wall thickness for each elbow.The results show that:(1) the new type elbow can reduce the stress greatly;(2) with the increasing diameter of elbow, the stress of inner elbow decreases gradually. Therefore, this new type of elbow can truly realize non-compensating installation in heating system.

A two-dimensional finite element simulation model of longitudinal welded pipe is established by the nonlinear finite element software ABAQUS. Testing enlargement mould is used for the expanding experiments for the welded pipe under the laboratory condition. The expanding force, ovality and the shape are simulated and measured. Comparing the experimental and the simulated results, the values are fitted well.

The influence of the crystallographic orientation, the level of axial strain and the test temperature on the progressive cross-section ellipticity of single crystal samples under uniaxial tension is analyzed in order to improve axial strain measurement in experiments. The direct three-dimensional finite element modeling of elasto-plastic deformation process of single-crystal initially cylindrical samples is used with taking into account finite strains, slip mechanisms and necking.

This work is devoted to the research of mechanical and strength properties of polymer composite material with short carbon fibers produced by injection molding technology. The material is PEEK90HMF20 with 20 % of carbon fibers mass fraction and based on polyether ether ketone (PEEK) polymer matrix. Mechanical and strength properties were researched on samples that had been cut from molded plates. A set of tension tests was performed and stress-strain diagrams of samples with different orientation in relation to the global direction of injection were obtained. Two-step homogenization procedure and pseudo-grains failure model were used to describe composite material behavior. The material model parameters were calibrated with experimental data by means of reverse-engineering procedure. Finite element simulation of tension tests was performed to check the quality of built model from the point of view of its ability to predict failure.

A stress state of the partially damaged underground steel pipeline after reconstruction by means of the fiberglass composite material is considered. The strength properties of the composite are determined experimentally. The effective elastic moduli of the composite are determined by means of the finite element homogenization. Tsai-Wu failure criterion is used for the composite part of the pipeline. The influence of geometrical parameters and loading conditions on the safety factor of the pipeline is analyzed and discussed.

This paper analyzes the performance of fiber carbon composite core rod under torsion load through finite element simulation and full-scale test, providing technical basis for the failure mode and key parameter design of fiber carbon composite core rod.

The evolution of charge weld during multi-hole porthole die extrusion was studied by means of finite element simulation and Taguchi’s design. Moreover, based on S/N analysis, the optimal process parameters that can reduce the charge weld length was obtained, where the billet diameter is 100 mm, extrusion speed is 2.0 mm/s, tool temperature is 430 °C and billet temperature is 465 °C. The accuracy and effectiveness of such optimal process parameters were also verified. The purpose of the present study is to provide some information about the controlling of charge weld for extrusion engineers.

This article reviews the experience of modeling and evaluation stability of braced shell with elastomeric bearing under static, seismic and extreme loads.

Overpass is the important part of urban transportation infrastructure. This paper adopts finite element method to carry out three-dimensional finite element simulation analysis for Longhai railway separate overpass. Researching variation law of the overpass’s stress and displacement in construction process and operating process. Analysis results show that, structure of Longhai railway separate overpass is reasonable, force of overpass structure is explicit, it meets the requirements for engineering.

With the rapid development of the city, the construction of underpass of adjacent subway tunnel will have influence on the safety of subway operation. Base on underground pedestrian passage engineering, the complex construction conditions of oblique crossing-over subway running tunnel for A section channel is considered, plane strain finite element simulation analysis for the excavation and support and secondary lining construction of A section channel are conducted, and two kinds of construction conditions of adjacent and crossing subway tunnel for A section channel are simulated, the influence of the construction of A section channel on adjacent subway running tunnel is also analyzed. The results were shown that the maximum floating upward value is within 1mm and almost no lateral displacement during the construction of A section channel. which meet the requirements of urban rail transit safety operation, and the basis for advanced control of underpass construction is provided.

In the summer of southern cities of China, the duration of high temperature becomes longer which requires stricter temperature control and crack prevention measures for mass concrete in construction. By using finite element method for unsteady temperature field and stress field a simulation is made for a pump station built in summer. The cement hydration velocity of this engineering is so high that makes the temperature control very difficulty. Through result analysis of different cases, some optimized measures which include surface preservation and water cooling are proposed. It has an important significance for concrete structure in the same area.

Shield tunning method has been used widely in urban underground engineering. Based on a certain range of Wuhan subway shield tunnel, the subway shield tunnel segment of the internal force and deformation were studied by the load structure method and stratum structure method. Influence of the formation parameters and the parameters of the lining structure on the segment internal force and deformation was analyzed. And the tunnel construction was modeled by three-dimensional dynamic finite element method. The influence of the construction process about ground subsidence and segment stress was discussed, in order to guide urban subway tunnel construction design.

The designing of composite structures for modern and precision application is complicated due to its anisotropic and inhomogeneous material behaviour. Therefore, reliable methodology for fully predicting the performance of composite structures must be developed. Hence, analytical and numerical solution will be implemented in order to perform failure analysis of composite laminates under biaxial loading. There are many approaches developed in order to study the failure behaviour of composites materials. This paper reviews and proposes a research framework that employs analytical method, numerical method using MATLAB programming and finite element method using ANSYS 14.0 to investigate the failure behaviour of composite structures. The First Ply Failure (FPF) and Last Ply Failure (LPF) analysis will be performed to determine the failure curves. Finally, the failure curves obtained from both analytical and finite element simulation will be compared with results published from previous experiments.

This paper starts from the design of seat frame made of lightweight, structural optimization and forming process to analyze the car seat design of lightweight. The paper analyze new aluminum alloy seat using finite element simulation analysis and are the analysis of the structural optimization design based on the results. On this basis, in order to reduce the weight of the seat frame, built design variables model with components of plate thickness, taking stiffness and the first torsion frequency of seat frame as state variables under different conditions, taking total mass of seat frame lightweight optimization goal to optimize its parameters of size structure. The seat frame not only meets the strength requirements, but also improves the utilization rate of materials, compared with the original structure; the quality is reduced by 9.6% and get better lightweight.

Tailored welded blank (TWB) consists of steel sheets of different thicknesses and strength which welded into one sheet to reduce weight and production costs, to increase dimensional accuracy and strength. Since a tailored blank is composed of different sheets of metals having different thicknesses and properties, the forming of tailored blanks then creates a lot of technical problems especially in the scheme of deformation. The objective of this work was to evaluate the drawability of tailored blanks. In order to assess the forming behavior of the tailor-welded blanks under the influence of weld orientations, a finite element and experimental methods were conducted. Three welded specimens with weld lines oriented at an angle of 0°, 90° and 45° with respect to the direction of load were investigated. The finite element result showed in a good agreement with the experimental result. The result of the experiment showed that a welded part was characterized by a higher strength and lower plasticity compared to those of the base material. Hence, the weld influences the strain distribution of the tailor-welded specimens. This phenomenon depends strongly on the direction of the weld against the direction of tensile load. The lowest strains occur in the specimen with a longitudinal weld.

Taking a certain dolphin structure of the ship lock in Jiangsu as an example, the finite analysis software ABAQUS was used to establish the 3D finite element model of ship, dolphin and foundation, and the process of collision was simulated for the transient dynamic analysis, obtained the collision force-time curve and the stress and strain of the dolphin, calculated ship collision force and compared with the norms used both in China and other countries. The results show that the maximum compressive stress is on the contact surface, the tensile stress is both on dolphin floor and back surface of the dolphin, and the maximum tensile stress is on the front teeth of dolphin floor; the ship collision force of finite element simulation is between Chinese norms and European norms. The results provide reference for the design of future dolphins.

Aiming at the issue on grinding burn of tooth face, the temperature field formed in helical gear form grinding was analyzed. The finite element model of the single tooth of helical gear was firstly established. Considering the nonlinear relation of the physical properties of gear material to temperature, 3D finite element simulation of transient temperature field was performed by using the rectangular moving heat source model. Finally, the temperature field distribution on tooth face was achieved. The study results show that the temperature is relative low when grinding starts, then the temperature increases rapidly, and the temperature reaches the maximum value at the end of grinding; the increase of grinding depth can result in the rise of temperature when other parameters are the constants.

Steel belt of buffer structure with plastic deformation, employed in vertical shaft lifting as a overwind protection device, is simple and of convenient maintenance. Steel strip bends large deformation and wear when passing through buffer structure, which will damage the buffer strip, and reduce its initial strength as well. This paper focuses on the influence of steel strip thickness and pressure roller diameter on the deformation of steel belt by applying the finite element simulation, to provide theoretical basis for reliability design of the steel strip.

In order to overcome the limitations of conventional ultrasonic testing method to detect small defects of carbon fiber composite material, ultrasonic nonlinear detection method was proposed based on finite amplitude. Firstly the detection mechanism of finite amplitude method was studied, then the detection model was created, and ultrasonic nonlinear characteristics of carbon fiber composites was analyzed by finite element simulation, finally relative non-linear coefficients follow the change of defect length and width show that the finite amplitude method has a high sensitivity to detect small defects.

The tightness of bolted flange joints will weaken due to the loss of bolt load as a result of creep under high temperature. There exists no mature calculation procedure that can accounts for creep. Based on the finite element simulation of a combined flanged joint under four various conditions, the strength integrity and sealing performance of it are evaluated according to the code JB4732-2005. The results show that the integrity and tightness of the combined flanged joint under pre-loading condition, pressure condition and operating condition (except local film stress) meet requirements. However, more than 50% of the bolt load relaxation is found due to creep, part of the gasket residual stress is lower than the required minimum sealing pressure. It can lead to leakage. Bigger bolt pre-tightening force, materials with good creep relaxation resistance and hot-tighting method are recommended to reduce the influence of creep.

There are many uncertainty factors which can influence the carrier pile design and construction, some of them can lead the deformation characteristic of carrier pile more complex, especially the carrier pile shape parameter. Based on the on-site testing results and the finite element simulation conclusion, the paper studied the effects of shape parameter on deformation characteristics of the carrier pile from the aspect of bottom head size, pile diameter size, gravel soil zone size, etc. The research found that increase the size of the bottom head and the size gravel soil zone can reduce the amount of deformation to a certain extent; the effect of pile diameter size increase on reducing the deformation is not obvious.

arch tunnel construction in the presence of construction mechanics often unclear, the lack of systematic design and construction of the theory can learn. Harbin Clinic Road thesis double-arch tunnel project as the basis, the construction process through its hole + CRD using the finite element simulation analysis and on-site monitoring measurement data processing, engineering arch tunnel song used in the wall study the mechanical properties.

Glare is one of the most important factors threating expressway traffic safety an night. The most commonly way to prevent glaring night is to set anti-glare plate. Different from the straight sections of expressway, the relationship between the front light of vehicles and the distance of anti-glare plate on the horizontal curved section has some-what changed. Through a lot of tests and finite element simulation, the relationship between the distance of anti-glare plate, horizontal curve radius and anti-glare effect were analyzed systematically. Distance calculation formula of anti-glare plate in horizontal curve sections was revised in this paper. The anti-glare plate distance requirement under different expressway alignment design indexes and its calculation formula was proposed. The achievement was beneficial to confirm the anti-glare effect and improve traffic safety. It can provide us with a reference and a supplement of the specification.

In this paper, the Xiali car Mcpherson type front suspension lower arm as the main research object, research the Xiali car converted to electric vehicles, the lower arm, internal stress distribution of structure on the lower arm, and on the basis of optimization design is carried out with ANSYS software. The last judgment andevaluation of prototype vehicle and electric vehicle arm stress, strain distribution and variation of structure on the lower arm, the topology optimization analysis is carried out, the lower arm to meet the strength and stiffness of the structure at the same time, meet the requirements of lightweight design.

Sensitivity analysis of model parameters is a rock fill parametric inversion analysis method to determine the unknown parameters. Traditional sensitivity analysis is basically a lot of trial or the method of single factor analysis based on a large amount of calculation, but, unable to reflect the real situation. The method of particle swarm optimization based on neural network based nonlinear mapping relationship between model parameters and displacement to finite element simulation of dam deformation. Basing on the orthogonal design, the methods of range analysis and variance analysis method were used for sensitivity analysis of the parameters of Duncan E-B model and the impact of various parameters on the dam displacement, and then it can be as the parameters of rock fill dam provide basis for determining the unknown parameters inversion.

Bead on plate activated tungsten inert gas (A-TIG) welding of duplex stainless steel (DSS) 2205 was performed to determine the thermal history, temperature distribution and the weld bead geometry. Finite element (FE) simulations were carried out using the software, SYSWELD considering the temperature dependent thermal and mechanical properties of the base material. A 3D double ellipsoidal heat source was employed for the non-linear thermal analysis. The transient temperature distribution, weld bead profile, weld bead dimensions, depth of penetration and bead width were calculated by FE simulation. The simulated weld bead profile was compared with the experimentally measured profile and found to be in agreement.

Hydraulic press occur elastic deformations in the working status. The deformation will affect the precision of the products. This paper expounds the method of using Laser tracker test rigidity of THP11-10000A isothermal forging hydraulic press. And we test the deformation of the lower bean, fit the date and compare with fitting of the finite element simulation results. The validity and the accuracy of the simulation results are verified.

In this paper, using ABAQUS, 16 high-strength concrete filled high-strength square steel tube middle-long columns’ axial compression process were simulated. The load-deflection relationships were obtained and the new combination in improving the bearing capacity and plastic deformation has a great advantage. Realization of length variation slenderness ratio by changing the length of column, this paper also study the influence of slenderness ratio, the main parameters of the high-strength concrete filled high-strength square steel tube middle-long column. It is found that both bearing capacity and the plastic capacity are associated with slenderness ratio.

In this paper, an efficient simulation program (FCG-System) is proposed to simulate 2D fatigue crack growth under mixed-mode loading conditions. The simulation is basically an incremental crack extension procedure. An object-oriented modeling frame is proposed for simulating fatigue crack growth of complex structures. The modeling frame is developed in the context of the commercial FE code ABAQUS, utilizing Python language and ABAQUS Scripting Interface (ASI). The highly automatic finite element simulation method is not only used for a single crack tip, but also has been extended to the system of interactive multiple cracks. The robustness and the accuracy of the new simulation code will be shown by two examples, including single crack growth and multiple cracks growth. Those applications indicate that the implementation of the FCG-System, as proposed herein, can be a useful tool for this class of fatigue crack growth.

The paper selected natural frequency and peak acceleration as comfort evaluation criteria. The author tested the new floor comfort under the human-induced loads. The author analyzed new floor comfort by selecting the worst possible scenarioes. The result indicates that the new floor satisfies the comfort requirement. The comparison of test value, theoretical value and finite element value of natural frequency proved that the finite element simulation was reasonable. The author analyzed comfort influencing factors of 7m×7m floor with the same simulation method and proposed a design proposal.

Noise and vibration analysis has become thoroughly researched in vehicle engineering where is needed to keep the noise level low and affect the vehicle users. The analysis in the paper shows a frequency response study where we will determine the frequency response on a coupled structure-fluid model. The study will be made on a simplified “train wagon“ model to show in a better way the differences between a perfect coupled structure-fluid model and a non-conformal coupling. The analysis shows that the distribution of the nodes for the two cases influences the results.

For a truck rear guard device connections is weak, the height from the ground does not meet the national standard. Used CATIA to design the latest kind of swinging truck rear underrun protector. The size of the latest protective frame meet the requirements of Chinese standard GB1567.2-2001. Used the finite element simulation of analysis software LS-DYNA, make the simulation experiment of rear end collision between a car and the truck. Analysis of the curve about the transient dynamic response, displacement, velocity and acceleration of protective frame in the process of collision, Clearly show the deformation process in the rear-end collision process of the protection frame. it proved the effectiveness of the protective frame. Analysis and collision simulation research of the latest underrun protective device.

Relationships among the forming conditions (such as shapes of dies, lubrication conditions, and slide motion of the press machine) and the thickening ratio (thickness after forming / thickness before forming) has been clarified in uniaxial press forming by experiments and a three dimensional finite element simulation. Steel pipes with 39.0mm and 7.6mm thickness were used in the experiment. The relationship between thickening ratio and the forming load that depends on the die shape, lubrication, and slide motion of the press machine was investigated. It has also been found that an eight percent increase of the wall thickness of the pipes could be possible without buckling. It has been clarified that thickening ratio during die forming could be predictable by using a finite element simulation.

The thickness and weight of a bulletproof glass material can be reduced by using strengthened glass that possesses current protective capabilities. In this study, numerical simulations are performed to estimate the protective capability of strengthened borosilicate glass used in bulletproof glass systems. High-velocity impacts and perforation behavior are well described by a dynamic brittle fracture model. A parametric study of the material model of glass is conducted by comparing test results of individual impacts with corresponding numerical estimations; the size of back-surface spall, morphology of perforated surface, and fractured areas are compared. Material parameters of strengthened and non-strengthened borosilicate glasses are determined. Numerical simulations that use a material model considering these parameters well describe the overall fracture behavior of bulletproof glass. The main parameters that affect protective capability are initial compressive yield and fracture stresses. The protective capability of strengthened borosilicate glass is ∼20% better than that of non-strengthened borosilicate glass.

The structural performance of thin-walled compression members are subject to the effects of local buckling, interaction between buckling modes, loading end conditions and material yielding and that due to these effects the compressive carrying capability of thin-walled members can be significantly diminished. This paper employs the finite element simulation to examine the local-overall flexural interaction response of pinned-ended thin-walled I-section columns that covers the complete compressed loading history from the onset of elastic local buckling through the nonlinear elastic and elasto-plastic post-buckling interactive phases of behaviour to final collapse and unloading. A detailed account of the growth and redistribution of stresses on the surfaces is given in the paper. Pinned-ended conditions means, of course, simply supported conditions at the column ends with respect to global rotations and the ends of the constituent plates of the cross-section can be treated as either locally rotationally constrained or locally rotationally free. The numerical simulations take into account the influence of material nonlinearity and geometrical imperfections on the compressive ultimate failures of the sections, however, the study is limited to the interaction of local buckling with overall flexural bending as well as locally rotationally constrained condition. This paper shows that the ultimate failure of the columns is related with yielding on the compression sides of the outer surfaces of the section walls at the web, flanges and section junctions mostly located along the length of the columns.

Proposed a concept, “cutting degree” as one of the parameters indicating the surface characteristics of the machined layer integrity. According to material nonlinearity, geometric nonlinearity, thermal coupling theory, established models of the vibratory cutting simulation, constitutive J-C model, shear model, boundary conditions, made finite element simulation of low-frequency vibration cutting by using software. Accessing to a visualization process, which is the change of material stress state in local area of the workpiece in cutting process. Analyzed the change of material stress states in local area of the workpiece, between low-frequency vibration cutting and non-vibration cutting machining process, other cutting parameters being equal. It is found that the values of cutting degree were apparently different in vibration cutting from those in non-vibration cutting. Contrasting experiments were done and SEM was observed of the machined surfaces. Findings of the experiment supported the simulation and to some extent validated the feasibility of the vision of 'cutting degree' as a term for expression of vibration cutting feature.

This study aims to analyze the functional contact pressure induced by Removable Partial Denture (RPD) by using a 3D finite element (FE) model constructed based on patient specific CT scans. This model was validated against the in vivo test results. The outcomes demonstrate that the finite element simulation has the capability of quantifying localized stress distribution in a complicated denture-mucosa contact problem, with a reasonable matching to clinical measurements of occlusal force and pressure distribution. The methodology is of considerable clinical implication to improve the long term outcomes of the denture treatment.

Composite insulators suspension clamp fractured of a high-voltage transmission lines in Yunnan. Through the broken suspension clamp conducted visual inspection, fracture examination, material analysis, finite element simulation to determine the cause of the accident and proposed improvements. For the electrical fittings defect detection and accident analysis provide reference.

Despite their ubiquity, the simulation of granular materials poses a continuing challenge in computational mechanics, as these materials can behave like solid, liquid and gas. In this paper, a recently developed version of the Particle Finite Element Method is applied for analyzing the behaviour of granular media under very large deformations. Both quasi-static and dynamic problems are considered. It is shown that this continuum approach is applicable to general large deformation problems of granular materials, including liquid-like flows.