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The interaction of fatigue cracks with a residual stress field using thermoelastic stress analysis and synchrotron X-ray diffraction experiments

机译：疲劳裂纹与残余应力场的相互作用的热弹性应力分析和同步加速器X射线衍射实验

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This article presents an experimental study on the fatigue behaviour of cracks emanating from cold-expanded holes utilizing thermoelastic stress analysis (TSA) and synchrotron X-ray diffraction (SXRD) techniques with the aim of resolving the long-standing ambiguity in the literature regarding potential relaxation, or modification, of beneficial compressive residual stresses as a result of fatigue crack propagation. The crack growth rates are found to be substantially lower as the crack tip moved through the residual stress zone induced by cold expansion. The TSA results demonstrated that the crack tip plastic zones were reduced in size by the presence of the residual compressive stresses induced by cold expansion. The crack tip plastic zones were found to be insignificant in size in comparison to the residual stress zone resulting from cold expansion, which implied that they were unlikely to have had a notable impact on the surrounding residual stresses induced by cold expansion. The residual stress distributions measured along the direction of crack growth, using SXRD, showed no signs of any significant stress relaxation or redistribution, which validates the conclusions drawn from the TSA data. Fractographic analysis qualitatively confirmed the influence on crack initiation of the residual stresses induced by the cold expansion. It was found that the application of single compressive overload caused a relaxation, or reduction in the residual stresses, which has wider implications for improving the fatigue life.
机译：本文提出了利用热弹性应力分析（TSA）和同步加速器X射线衍射（SXRD）技术对冷膨胀孔产生的裂纹疲劳行为进行实验研究的目的，旨在解决文献中长期存在的关于潜力的歧义疲劳裂纹扩展导致的有益压缩残余应力的松弛或改变。当裂纹尖端移动通过由冷膨胀引起的残余应力区时，发现裂纹生长速率大大降低。 TSA结果表明，由于存在由冷膨胀引起的残余压缩应力，裂纹尖端的塑性区尺寸减小。与由冷膨胀引起的残余应力区相比，发现裂纹尖端塑性区的尺寸微不足道，这意味着它们不太可能对由冷膨胀引起的周围残余应力产生显着影响。使用SXRD沿裂纹扩展方向测得的残余应力分布没有任何明显的应力松弛或重新分布的迹象，这验证了从TSA数据得出的结论。分形分析定性地证实了冷膨胀引起的残余应力对裂纹萌生的影响。已经发现，一次压缩过载的施加导致松弛或残余应力的减小，这对于改善疲劳寿命具有更广泛的意义。

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