摘要
Aiming at the fatigue fracture problem of light Al-Li alloy in service environment, the third generation aluminum-lithium alloy 2195-T8 was taken as the research object. Experimental and simulation of the fatigue crack propagation behavior of the third-generation 2195-T8 Al-Li alloy with defects was investigated by constant amplitude tensile fatigue test and equivalent crack model. The results show that the fatigue crack starts at the bottom of the defect, and the crack growth rate is the fastest in the surface length direction, but the slowest in the depth direction. The fatigue fracture of 2195-T8 aluminum-lithium alloy has a typical delaminalion phenomenon, and the delamination of alloy greatly hinds the crack tip depth direction expansion, resulting in crack bifurcation. After the crack bifurcation, the propagation rate increases sharply, and the plastic region volume at the tip increases rapidly, which makes the alloy enter the rapid fracture zone. The above results show that the fatigue life of 2195-T8 Al-Li alloy with defects is reduced by crack propagation inclination and delaminalion.
投稿的翻译标题 | Fatigue fracture behavior and simulation analysis on 2195-T8 Al-Li alloys with defects |
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源语言 | 繁体中文 |
页(从-至) | 168-178 |
页数 | 11 |
期刊 | Guofang Keji Daxue Xuebao/Journal of National University of Defense Technology |
卷 | 46 |
期 | 5 |
DOI | |
出版状态 | 已出版 - 10月 2024 |
已对外发布 | 是 |
关键词
- Al-Li alloys
- crack propagation
- fatigue fracture
- finite element