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The effects of scratches and shot peening on the fatigue crack growth of aluminum alloy 2024-T3.

机译：划痕和喷丸处理对铝合金2024-T3疲劳裂纹扩展的影响。

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摘要

The primary objective of the research was to investigate the effects of scratch, shot peening and specimen orientation on the crack growth of aluminum alloy 2024-T3. An experimental study was performed to determine the crack growth rates of scratched-then-shot peened specimens and scratched specimens in various specimen orientations. Tests were conducted at a constant stress amplitude with different stress ratios. The crack growth rate of a scratched specimen increased with increasing the scratch depth. Glass shot peening significantly reduced crack growth rates of scratched specimens. The crack growth data of scratched-then-peened specimens were similar to those of as-received specimens at low and intermediate {dollar}rm Delta K{dollar} ranges. The specimen orientation had effects on the fatigue life but no effects on the crack growth rate. Increase in the positive stress ratio increased crack growth rates of specimens. However, the change of the negative stress ratio resulted in different effects. In addition, it was found that the scratch exhibited small crack growth behavior. This behavior is related to the crack's shape change occurring after crack's going through the thickness of a specimen. An analysis model for stress intensity factor {dollar}rm Delta Ksb{lcub}scr{rcub}{dollar} for scratched specimens was developed. Crack growth rates of scratched specimens showed a good relationship with {dollar}rm Delta Ksb{lcub}scr{rcub}.{dollar}
机译：该研究的主要目的是研究划痕，喷丸处理和试样取向对铝合金2024-T3裂纹扩展的影响。进行了一项实验研究，以确定刮擦然后喷丸处理的样品和刮擦样品在各种样品方向上的裂纹扩展速率。以恒定的应力振幅和不同的应力比进行测试。划痕试样的裂纹扩展速率随划痕深度的增加而增加。玻璃喷丸处理显着降低了划痕试样的裂纹扩展速率。划痕然后喷丸的试样的裂纹扩展数据与在rm Delta K {dollar}范围的中低范围内的原始试样相似。试样取向对疲劳寿命有影响，但对裂纹扩展率没有影响。正应力比的增加增加了试样的裂纹扩展速率。但是，负应力比的变化导致不同的效果。另外，发现划痕表现出小的裂纹扩展行为。此行为与裂纹穿过试样的厚度后发生的裂纹形状变化有关。建立了划痕试样的应力强度因子{rmal Delta Ksb {lcub} scr {rcub} {dollar}的分析模型。划痕试样的裂纹扩展速率与{rm} rm Delta Ksb {lcub} scr {rcub}有很好的关系。{dollar}

著录项

  • 作者

    Shao, Min.;

  • 作者单位

    Wichita State University.;

  • 授予单位 Wichita State University.;
  • 学科 Engineering Materials Science.; Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 1995
  • 页码 137 p.
  • 总页数 137
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;机械、仪表工业;
  • 关键词

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