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Evaluation of crack-closure by second harmonic thermoelastic stress analysis
International Journal of Fatigue ( IF 6 ) Pub Date : 2022-07-08 , DOI: 10.1016/j.ijfatigue.2022.107116
Giuseppe Pitarresi , Riccardo Cappello

The work illustrates a new experimental approach to evaluate crack-closure in samples undergoing Fatigue Crack-Growing. Crack-closure leaves a peculiar signature on both amplitude and phase of the harmonic of the temperature signal at twice the loading frequency (Second Harmonic), due to the periodic nature of the internal elastic compression stresses. Thermoelastic Stress Analysis (TSA) is successfully applied to reveal such signatures on Single-Edge-Notched steel samples. A methodology is also proposed to evaluate the Crack-Opening-Load from temperature data. The work finally explores the influence of crack-closure on crack-tip identification and on the evaluation of the Stress Intensity Factor from TSA.



中文翻译:

通过二次谐波热弹性应力分析评估裂纹闭合

这项工作说明了一种新的实验方法来评估经历疲劳裂纹生长的样品的裂纹闭合。由于内部弹性压缩应力的周期性,裂纹闭合在两倍加载频率(二次谐波)的温度信号谐波的幅度和相位上留下了特殊的特征。热弹性应力分析 (TSA) 已成功应用于揭示单边缺口钢样品上的此类特征。还提出了一种方法来评估温度数据中的开裂载荷。这项工作最终探讨了裂纹闭合对裂纹尖端识别和 TSA 应力强度因子评估的影响。

更新日期:2022-07-13
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