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Nonlinear Ultrasonic Techniques for Testing Micro-Defects in Metal Matrix Composite Structure

机译：用于测试金属基复合结构微缺陷的非线性超声技术

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摘要

Micro-defects inside metal matrix composite structure seriously influence the mechanic properties of materials and can undermine machine operations. In order to detect the micro-defects, we can make use of one of the nonlinear acoustic features, i.e., harmonics, which usually appear together with ultrasound when propagating through a damaged material. Based on the relationship between the harmonics, a method of using nonlinear acoustic harmonic amplitude ratio to distinguish micro-defects in metal matrix composite structure is discussed. The test results show that acoustic features, such as second harmonic excitation efficiency were very obvious for the damaged group samples. The method presented is effective in detecting the micro-defects, which means that nonlinear acoustic waves may provide us a good solution for quantitative evaluation of the early damages in metal matrix composite structure.
机译：金属基复合材料结构内部的微缺陷会严重影响材料的机械性能，并可能破坏机器的运行。为了检测微缺陷，我们可以利用非线性声学特征之一，即谐波，当在受损材料中传播时，谐波通常与超声波一起出现。基于谐波之间的关系，讨论了一种利用非线性声谐波振幅比来区分金属基复合结构微缺陷的方法。测试结果表明，受损组样本的声学特征（如二次谐波激发效率）非常明显。提出的方法可以有效地检测出微缺陷，这意味着非线性声波可以为定量评估金属基复合材料结构的早期损伤提供良好的解决方案。

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