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Methodology for Evaluation of Residual Stress Effect on Small Corner-Crack Initiation and Growth

机译:残余应力对小拐角裂纹萌生和生长的影响的评估方法

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摘要

The growth behavior of a naturally initiated corner crack under a uniform residual stress field is investigated in this study. A convenient method is proposed to induce and evaluate the uniform residual stress field for a beam-type specimen. Fatigue tests are conducted with a rotary bending fatigue machine to investigate the growth of the corner crack. For this reason, a cylindrical specimen, which is typically used for rotating bending tests, is modified into a beam specimen. The corner crack growth behavior under residual stress is evaluated based on linear elastic fracture mechanics (LEFM) and compared with long through crack data. The test results verify that the corner crack growth under residual stress can be effectively evaluated by LEFM and estimated using long crack data.
机译:本研究研究了在均匀残余应力场下自然引发的角裂纹的生长行为。提出了一种方便的方法来诱导和评估梁型试样的均匀残余应力场。用旋转弯曲疲劳机进行疲劳测试,以研究拐角裂纹的增长。因此,通常将用于旋转弯曲试验的圆柱形试样修改为梁试样。基于线性弹性断裂力学(LEFM)评估残余应力下角部裂纹的扩展行为,并将其与长期裂缝数据进行比较。测试结果验证了LEFM可以有效评估残余应力下的角裂纹扩展,并使用长裂纹数据进行估算。

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