Study on deformation and damage mechanism of alumi

2022-09-27
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Research on the deformation and damage mechanism of aluminum alloys under different stress states

1 preface

in order to meet the requirements of energy conservation and environmental protection, a large number of aluminum alloys have become the main materials of transportation. An important performance index of vehicles is impact resistance. During the impact process of aluminum alloy automobile components, there are more than 20 enterprises in the country who deliberately enter the lithium battery diaphragm industry. The stress state of components is different at all points, and the stress state of each point also changes with time during the impact process. Therefore, in order to study the deformation and damage mechanism of automotive aluminum alloy components under different stress states, 0 °, 30 °, 45 °, 60 °, 90 ° tensile and tensile unloading tests were carried out on butterfly specimens with modified arcan fixtures. A large number of studies have shown that there are two macro fracture modes in aluminum alloys: dimple fracture mode and shear fracture mode. Microscopically, the dimple fracture of the material is caused by hole nucleation, expansion and convergence; The micromechanism of shear fracture is the cracking and convergence of the micromechanism shear plane in the material. By studying LY12 aluminum alloy, Tang Anmin [po] found that there are indeed two different fracture forms in this material, namely normal tension fracture and shear fracture. In this experiment, the butterfly shaped specimen is used to carry out the tensile tests of acid and other mixtures at different angles on the modified arcan fixture, which makes the butterfly shaped specimen produce different stresses, and also provides a reference force state for the development direction of the future automobile. The deformation and damage mechanism of 6063 aluminum alloy under several different stress states are studied

2 experiment

the material used in this experiment is 6063 aluminum alloy of rolled Al Mg SI system, and the supply state is T6. The percentage content of each element in the material is as follows: mg: 0.45~0.9; Si: 0.2~0.6; Zn, Cr, Ti and Mn

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