This article presents an experimental investigation of repair of a crack in a structure using piezoelectric material under thermo-mechanical loading environment. The cyclic mechanical load is applied on a plate with a straight and angular crack under uniform temperature environment. Two cases have been considered for the repair of crack under (a) mechanical loading and (b) thermo-mechanical loading environment. A piezoelectric sensor is utilized to measure voltage. The measured voltage is used to calculate the stress intensity factor in passive and active modes. The effect of a single and double piezoelectric patch in the repair of the plate is investigated. The double piezoelectric patch is found to be more effective as compared to single patch when placed symmetrically offset from the crack. An optimal value of voltage and phase difference is evaluated for most effective crack repair. Location of the piezoelectric patch is varied with respect to crack location, and best-suited position for effective crack repair is proposed. The viability of piezoelectric used for repair under thermo-mechanical loading is discussed. The active mode of repair by piezoelectric is found to be effective under thermo-mechanical loading environment.

中文翻译：

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热机械载荷下压电材料裂纹修复研究

本文介绍了在热机械载荷环境下使用压电材料修复结构裂纹的实验研究。在均匀温度环境下，在具有直角裂纹的板上施加循环机械载荷。在 (a) 机械载荷和 (b) 热机械载荷环境下修复裂纹已经考虑了两种情况。压电传感器用于测量电压。测量的电压用于计算被动和主动模式下的应力强度因子。研究了单压电片和双压电片在板修复中的作用。当与裂缝对称地偏移放置时，发现双压电贴片与单贴片相比更有效。为最有效的裂纹修复评估电压和相位差的最佳值。压电贴片的位置根据裂纹位置而变化，并提出了最适合有效裂纹修复的位置。讨论了在热机械载荷下用于修复的压电材料的可行性。发现压电的主动修复模式在热机械负载环境下是有效的。