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首页> 外文期刊>International Journal of Fatigue >Investigation of fatigue crack propagation mechanisms of branching crack in 2324-T39 aluminum alloy thin plates under cyclic loading spectrum
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Investigation of fatigue crack propagation mechanisms of branching crack in 2324-T39 aluminum alloy thin plates under cyclic loading spectrum

机译：2324-T39铝合金薄板循环载荷谱下分支裂纹疲劳裂纹扩展机理研究

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摘要

Significant macroscopic crack branching has been observed in the crack growth paths of 2324-T39 aluminum alloy under spectrum loading, the mechanisms of which was investigated in this paper. The relationships between microscopic fracture surface characteristics and macroscopic fatigue crack growth paths and the relationship between plastic zone size and fracture surface characteristics were revealed. The change in fracture mode, which relates to the changes in the plastic zone in the thickness direction, and the growth of secondary cracks led to the appearance of branched cracks. A high level of σ_x, σ_z leads to mixed-mode growth of the subsurface secondary cracks.
机译：在2324-T39铝合金的裂纹扩展路径下，在频谱载荷下观察到明显的宏观裂纹分支，并研究了其机理。揭示了微观断裂表面特征与宏观疲劳裂纹扩展路径之间的关系，以及塑性区尺寸与断裂表面特征之间的关系。断裂模式的变化与厚度方向塑性区的变化有关，二次裂纹的生长导致出现分支裂纹。较高的σ_x，σ_z导致地下次生裂纹的混合模式增长。

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  • 来源
    《International Journal of Fatigue》 |2016年第3期|602-615|共14页
  • 作者

    Zhang Ting; Bao Rui; Lu SongSong; Fei Binjun;

  • 作者单位

    Institute of Solid Mechanics, School of Aeronautic Science and Engineering, Beihang University (BUAA), Beijing 100191, PR China;

    Institute of Solid Mechanics, School of Aeronautic Science and Engineering, Beihang University (BUAA), Beijing 100191, PR China;

    Institute of Solid Mechanics, School of Aeronautic Science and Engineering, Beihang University (BUAA), Beijing 100191, PR China;

    Institute of Solid Mechanics, School of Aeronautic Science and Engineering, Beihang University (BUAA), Beijing 100191, PR China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Aluminum alloy; Fatigue crack growth; Crack branching; Fracture characteristics; Crack-tip stress field;

    机译：铝合金;疲劳裂纹扩展;裂纹分支;断裂特征;裂纹尖端应力场;

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