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Research on Nonlinear Ultrasonic NDT of Microcracks

机译：微裂纹非线性超声波NDT研究

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摘要

Microcracks inside metallic materials seriously influence the mechanic properties of materials and can endanger machine operations. The nonlinear acoustic features, such as harmonics will appear with ultrasound through a damaged material. Based on the relationship between the harmonics, a method using nonlinear acoustic harmonic amplitude ratio to distinguish microcracks in metallic materials 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 sensitive to the microcracks, demonstrating the potential of nonlinear acoustic waves to provide a quantitative evaluation of the early damage materials.
机译：金属材料内的微裂纹严重影响了材料的机械性能，可以危及机器操作。非线性声学特征，例如谐波将通过损坏的材料进行超声波出现。基于谐波之间的关系，讨论了使用非线性声学谐波幅度与区分金属材料中微裂纹的方法。测试结果表明，损坏的组样品，声学特征，例如二次谐波激发效率非常明显。呈现的方法对微裂纹敏感，证明了非线性声波的电位，以提供对早期损伤材料的定量评估。

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