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首页> 外文期刊>International Journal of Fatigue >The nature of specimen-size-effect on fatigue crack growth and net-section fracture mechanics approach to extract the size-independent behavior
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The nature of specimen-size-effect on fatigue crack growth and net-section fracture mechanics approach to extract the size-independent behavior

机译：试样尺寸效应对疲劳裂纹生长和净骨折力学方法提取尺寸无关行为的性质

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摘要

A specimen-size-effect is found in the experimental fatigue crack growth behavior of single-edge-cracked fracture specimens, where the specimen length-to-width ratio was varied by about a factor of four. This effect appears from certain geometric correction factors (GCFS) used for the calcuation of the stress intensity range in fracture mechanics. It is shown that the net-section-based fracture mechanics approach provides a unique correlation of the fatigue crack growth data, for all specimen sizes, when the change in the net-section strain energy is used as the crack driving force parameter. The fatigue crack growth data could be correlated extremely well, when an effective specimen length, including the elastic strain energy of the specimen portion within the grips, is included in the driving force calculations. This effective length is determined by shear-lag analysis. It is also demonstrated that a true size-independent fatigue crack growth behavior can be obtained through the net-section based approach, using the concept of the change in net-section strain energy.
机译：在单边缘裂纹骨折样品的实验疲劳裂纹生长行为中发现了样品尺寸效应，其中试样长度与宽度比变化了大约四倍。这种效果出现在某些几何校正因子（GCF）中，用于勘探力力学中应力强度范围的钙化。结果表明，基于网段的断裂力学方法提供了疲劳裂纹增长数据的独特相关性，对于所有样品尺寸，当使用净应变能量的变化用作裂缝驱动力参数时。当具有夹具内的样本部分的有效样品长度的有效样品长度，包括在驱动力计算中，疲劳裂纹生长数据可以非常吻合。这种有效长度由剪切滞后分析确定。还证明，可以通过基于网截面的方法来获得真正的独立疲劳裂纹生长行为，使用Net-段应变能量的变化的概念。

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