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4. Optimization of tire-ground performance through meshed belt layer structure.

Author

Mao, Rui, Sun, Pengfei, Zhou, Shuiting, Chen, Luwen, Meng, Junling, Yang, Wenqi, Yang, Chenyi, and Luo, Kejie

Subjects
FINITE element method, DEAD loads (Mechanics), AUTOMOBILE tire testing, NYLON, STRAINS & stresses (Mechanics)
Abstract

Using Abaqus finite element software, this study investigates the impact of different carcass belt layer structures on the grounding characteristics of tires. Focusing on the 215/55R17 radial tire, the research proposes a structural optimization scheme and establish a finite element model. The standard tire belt layer structure is replaced with a mesh belt layer structure to achieve optimized performance. Through static loading tests on the tire, the accuracy of the finite element model was validated. By altering the density, number of layers of the mesh belt structure, and radial load of the tire, a simulation analysis is conducted to study the impact on tire deformation and stress on the carcass material. The optimized tire features increased radial stiffness and reduced tread wear. The density of the mesh belt layer in the contact area affects tire deformation as well as the stress on the belt layer and ply layer. The results indicate that the mesh belt layer can effectively absorb the radial load of the tire, optimizing tire deformation by 20% to 30%. Under different loads, the tire with a 70-density mesh belt layer can reduce surface stress by approximately 40%, or around 230J. The mesh belt layer tire can reduce the sensitivity of the tire center to high load stresses, optimizing 25% of the concentrated stress at the shoulder position of the ply layer. When a double-layer belt is used, the strength at the shoulder increases with the number of belt layers, reducing stress by approximately 2-4N. The structural form of the belt layer has little impact on the trend of stored strain energy changes, but the number of belt layers significantly affects the amount of change in the tire's strain energy. On average, about 10% of the stored strain energy is reduced due to changes in the belt layer structure. [ABSTRACT FROM AUTHOR]

Published
2024
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12. Highly Efficient and Stable Intermediate-Temperature Solid Oxide Fuel Cells Using PrCo0.5Ni0.5O3−δCathode

Author

Huang, Wan, Tian, Chuan, Meng, Junling, Xu, Na, Zhang, Yao, Zhao, Lina, and Zhong, Haixia

Abstract

Oxygen reduction reaction is crucial for the development of intermediate/low-temperature solid oxide fuel cells (SOFCs), thus the development of cathode materials with high catalytic activity and stability is still a great challenge for the commercialization of SOFC. In this study, a series of La1–xPrxCo0.5Ni0.5O3−δ(x= 0.5, 0.75, and 1.0) perovskite oxides were prepared as oxygen reduction reaction catalysts for SOFC. First, the polycrystalline powders were synthesized by a Pechini method, and the crystal structure was confirmed as orthorhombic symmetry with Pbnm(No. 62) space group. Second, it was found that PrCo0.5Ni0.5O3−δ(PCN) presents the best electrochemical performance among the three compounds. The polarization impedance of PCN was 0.0383 Ω cm2and the peak power density reached 1.47 W cm2using wetted hydrogen as fuel and air as the oxidant measured at 850 °C. Meanwhile, the single cell with PCN as the cathode could stably work for 100 h at 750 °C without damping. Finally, combined with the first-principles calculations, it was revealed that the doping of Pr ion can effectively reduce oxygen vacancy formation energy and mainly changed the valence states of Co and Ni ions at B-site. Therefore, PCN is expected to be a promising cathode material for SOFC.

Published
2024
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18. Analysis of cord stress during tire dynamic longitudinal slip.

Author

Chen, Luwen, Sun, Pengfei, Zhou, Shuiting, Meng, Junling, Qian, Chao, and Sun, Xin

Subjects
STRAINS & stresses (Mechanics), FINITE element method, AUTOMOBILE tire testing, EXTREME value theory, MATERIALS testing
Abstract

Selected 215/55 R17 radial tires for material test to obtain relevant material parameters. Used these parameters to build a finite element model and conduct longitudinal slip simulation. The relationship between longitudinal force and slip rate at different speeds and loads was determined by tire longitudinal slip tests. Then the longitudinal slip simulation results were compared with the test results to verify the feasibility of the model. The circumferential and axial rebar force of the belt layer at different speeds and the extreme value of the circumferential rebar force on the reverse-envelope of different skeleton materials were analyzed. The results show that: in the static state, the cord force of the belt layer had shown a trend consistent with the direction of the cord arrangement. As the speed increased, the belt cord force exhibited significant fluctuations and asymmetry. The rebar force of the turn-up points on the belt and ply is significantly smaller compared to the fetal crown ply. The rebar force at the fetal crown and belt wrapping points at 60 km/h was smaller than at 40 km/h and 80 km/h. The cord force of the fetal crown ply and the belt ply is much more affected by the load than that of the ply. [ABSTRACT FROM AUTHOR]

Published
2023
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