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Crack interaction in NDE of multiple cracks by means of potential drop technique

机译:电位降技术在多裂纹无损检测中的裂纹相互作用

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摘要

A method is developed to evaluate crack interaction in NDE of multiple cracks by d.c. potential drop technique. A subregion containing m(= 1,3,5,…) cracks are considered. The potential drop of the middle crack for each subregion are considered for two successive cases (m and m+2) and compared. The ratio of these two potential drops shows the effect of the first and last cracks of the subregion on the potential drop of the middle crack. Comparison of the potential drop of the middle crack with the potential drop of a single crack with the same depth and the same positions of potential probes shows the crack interaction. The method is based on the FEM. Experimental data verify the numerical results.
机译:开发了一种通过dc评估多个裂纹在NDE中的裂纹相互作用的方法。电位降技术。考虑包含m(= 1,3,5,...)裂纹的子区域。考虑两个连续情况(m和m + 2)并比较每个子区域的中间裂纹的电位降。这两个电位降的比率显示了该子区域的第一个和最后一个裂纹对中间裂纹的电位降的影响。将中间裂纹的电位降与具有相同深度和相同位置的电位探针的单个裂纹的电位降进行比较可以看出裂纹的相互作用。该方法基于FEM。实验数据验证了数值结果。

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