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Identification of Crack-Tip Parameters Using Thermoelastic Isopachics and Differential Evolution

机译:利用热弹性等速和微分演化识别裂纹尖端参数

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A curve-fitting routine based on a Differential Evolution (DE) is used to generate noise-free cardioid curves from thermoelastic data obtained from the neighbourhood of a crack-tip. The technique is benchmarked using simulated thermoelastic data. The generated cardioid curves are used to determine the stress intensity factors (SIFs) from slots and real cracks loaded in mode 1. The derived SIFs show excellent agreement with theory and confirms the validity of the approach. The curve-fitting approach allows more information to be obtained from the thermoelastic data than previous analysis routines and will provide a basis for further development of thermoelastic stress analysis for application in crack-tip stress studies. A means for evaluating the far field stress term, σ_(0x), from the generated contours is also described.
机译:基于微分进化(DE)的曲线拟合例程用于根据从裂纹尖端附近获得的热弹性数据生成无噪声的心形曲线。该技术使用模拟的热弹性数据进行基准测试。生成的心形曲线用于确定在模式1下加载的缝隙和实际裂缝中的应力强度因子(SIF)。派生的SIF与理论非常吻合,证实了该方法的有效性。曲线拟合方法允许从热弹性数据中获得比以前的分析例程更多的信息,并将为进一步开发用于裂纹尖端应力研究的热弹性应力分析提供基础。还描述了一种根据生成的轮廓评估远场应力项σ_(0x)的方法。

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