An experimental investigation on the fatigue crack growth behaviour of AISI/SAE 1045 under load sequences containing underloads
An experimental investigation on the fatigue crack growth behaviour of AISI/SAE 1045 under load sequences containing underloads
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DOI：
10.1111/ffe.12953
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发表时间：
2018-11
影响因子：
3.7
通讯作者：
H. Richter;M. Sander
中科院分区：
文献类型：
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作者：
H. Richter;M. Sander
载荷相互作用效应的估计是含裂纹构件剩余寿命计算的基础。虽然超载得到了广泛的研究，但对于欠载的影响和机制仍没有达成共识。为此，本文对含有欠载的荷载序列进行了实验研究。由于Kmax和Re不适用于描述拉/压载荷下的循环裂纹尖端载荷，因此用σ尖端的概念来量化压缩载荷下的裂纹驱动力。在其他测试中，测试还包括尚未在文献中报告的加载序列，例如在超载后在特定距离施加的欠载。还研究了欠载对裂纹止裂的影响。对AISI/SAE1045工具钢进行了试验研究。
The estimation of load interaction effects is essential for residual lifetime calculations of components with cracks. Whereas overloads are widely investigated, there is still no consensus about the effects and mechanisms of underloads. For this reason, load sequences containing underloads are experimentally examined within this paper. BecauseKmaxandRare not appropriate for describing the cyclic crack tip loading at tension/compression loading, theσtipconcept is used to quantify the crack driving force at compressive loads. Among others, the tests also include load sequences that have not been reported in the literature yet like underloads that are applied at a certain distance after an overload. The influence of underloads on crack arrest is also investigated. The experimental tests are performed with the tool steel AISI/SAE 1045.