...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >A study of the crack wake closure/opening behaviour of short fatigue cracks and Its Influence on crack growth
【24h】

A study of the crack wake closure/opening behaviour of short fatigue cracks and Its Influence on crack growth

机译：疲劳短裂纹的裂纹尾部开合行为及其对裂纹扩展的影响研究

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Crack closure behaviour has long been found to have a significant influence on fatigue crack growth and a large amount of research has been done in the past 3 decades. Whereas the majority of these research efforts focus on long cracks, relatively little is known for short fatigue cracks, in particular for microstructurally short cracks. This paper presents a quantitative characterisation of the wake closure/opening behaviour of microstructurally short fatigue cracks under cyclic loading for a structural aluminium alloy 2024-T351 using an p situ SEM fatigue testing system. The results clearly indicate that crack closure level was at a peak value at crack lengths of -100-150 pan. Beyond the regime of short crack growth, the crack closure stress decreases gradually with crack length, approaching asymptotically to a constant value at crack lengths of about 1.5 mm. In addition, it was found that the crack closure/opening stress intensity factor, T_(cl) (X_(op)), is nearly constant while the maximum stress intensity factor increases with crack size. Therefore, the effect of crack closure is most significant in the early stage of short fatigue crack propagation. The experimental results have also been compared with those predicted by Newman's model and a model previously developed by the authors.
机译：长期以来，人们一直发现裂纹闭合行为对疲劳裂纹的生长具有重大影响，并且在过去的30年中进行了大量的研究。尽管这些研究工作大部分集中在长裂纹上，但对于短疲劳裂纹，尤其是在微观结构上的短裂纹，知之甚少。本文使用原位SEM疲劳测试系统对结构铝合金2024-T351在循环载荷下微观结构短疲劳裂纹的尾流闭合/打开行为进行了定量表征。结果清楚地表明，裂纹闭合水平在裂纹长度为-100-150 pan时达到峰值。除了短裂纹的扩展，裂纹闭合应力随着裂纹长度的增加而逐渐减小，在大约1.5 mm的裂纹长度处渐近地接近恒定值。另外，发现裂纹闭合/打开应力强度因子T_（cl）（X_（op））几乎恒定，而最大应力强度因子随裂纹尺寸而增加。因此，在短时疲劳裂纹扩展的早期，裂纹闭合的效果最为显着。实验结果也与纽曼模型和作者先前开发的模型所预测的结果进行了比较。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号