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首页> 外文期刊>Journal of Materials Engineering and Performance >Damage Characterization and Real-Time Health Monitoring of Aerospace Materials Using Innovative NDE Tools
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Damage Characterization and Real-Time Health Monitoring of Aerospace Materials Using Innovative NDE Tools

机译：使用创新的NDE工具对航空航天材料进行损伤表征和实时健康状况监控

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摘要

The objective of this work is to characterize the damage and monitor in real-time aging structural components used in aerospace applications by means of advanced nondestructive evaluation techniques. Two novel experimental methodologies are used in this study, based on ultrasonic microscopy and nonlinear acoustics. It is demonstrated in this work that ultrasonic microscopy can be successfully utilized for local elastic property measurement, crack-size determination as well as for interfacial damage evaluation in high-temperature materials, such as metal matrix composites. Nonlinear acoustics enables real-time monitoring of material degradation in aerospace structures. When a sinusoidal ultrasonic wave of a given frequency and of sufficient amplitude is introduced into a nonharmonic solid, the fundamental wave distorts as it propagates, and therefore the second and higher harmonics of the fundamental frequency are generated. Measurements of the amplitude of these harmonics provide information on the coefficient of second- and higher-order terms of the stress-strain relation for a nonlinear solid. It is shown in this article that the material bulk nonlinear parameter for metallic alloy samples at different fatigue levels exhibits large changes compared to linear ultrasonic parameters, such as velocity and attenuation.
机译：这项工作的目的是通过先进的非破坏性评估技术来表征损坏并实时监控航空航天应用中使用的结构部件的老化情况。在这项研究中，基于超声显微镜和非线性声学，使用了两种新颖的实验方法。这项工作表明，超声显微镜可以成功地用于高温弹性材料（如金属基复合材料）的局部弹性性能测量，裂纹尺寸确定以及界面损伤评估。非线性声学特性可以实时监控航空结构中的材料降解情况。当将给定频率和足够振幅的正弦超声波引入非谐波固体时，基波在传播时会发生畸变，因此会产生基频的二次谐波和更高次谐波。这些谐波幅度的测量提供了有关非线性实体的应力-应变关系的二阶和高阶项的系数的信息。本文表明，与线性超声参数（例如速度和衰减）相比，在不同疲劳水平下金属合金样品的材料体积非线性参数表现出较大的变化。

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