含缺陷 2195-T8 铝锂合金疲劳断裂与仿真分析

Dejun Liu, Gan Tian, Yulong Li, Guofeng Jin, Wei Zhang

科研成果: 期刊稿件文章同行评审

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
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
46
5
DOI
出版状态已出版 - 10月 2024
已对外发布

关键词

  • Al-Li alloys
  • crack propagation
  • fatigue fracture
  • finite element

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