非线性超声调制检测铝合金结构疲劳损伤

Ling Yan, Lijia Luo, Fengping Zhong, Zuming Zhao, Jingjing Fan, Liuyi Huang, Shiyi Bao, Jianfeng Mao
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引用次数: 1

摘要

本文提出了一种用于铝合金结构早期疲劳损伤检测的非线性超声调制方法。通过疲劳试验,制备了7个不同疲劳损伤程度的铝合金试样。设计了一套非线性超声调制检测铝合金试件疲劳损伤的实验系统。利用单个压电陶瓷换能器发射两个不同超声频率的叠加正弦波。选取高频作为低频的非整数倍,以区别于超谐波响应。探讨了非线性调制响应对激励信号频率和幅值的依赖关系,以选择合适的信号激励参数。非线性调制指数(NMI)定义为调制响应与线性响应的幅值之比,用于评价试件的疲劳损伤。试验结果表明,NMI随疲劳损伤程度单调增加,可用于量化试件疲劳损伤累积。提出的非线性超声调制方法有利于铝合金结构疲劳损伤的检测和损伤程度的进一步评估。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Detection of Fatigue Damage in Aluminum Alloy Structures Using Nonlinear Ultrasonic Modulation
In this paper, a nonlinear ultrasonic modulation method is developed to detect early fatigue damage in aluminum alloy structures. Seven aluminum alloy specimens with different fatigue damage degrees are prepared by fatigue test. An experimental system is designed for performing nonlinear ultrasound modulation detection of fatigue damage in aluminum alloy specimens. A single piezoceramic transducer is used to emit two superposed sinusoidal waves with different ultrasonic frequencies. The higher frequency is chosen as a non-integer multiple of the lower frequency so as to be distinguished from super-harmonic responses. The dependencies of the nonlinear modulation response on the frequency and amplitude of excitation signals are explored to select appropriate signal excitation parameters. A nonlinear modulation index (NMI) is defined as the amplitude ratio of modulation responses and linear responses, which is used to evaluate fatigue damage of specimens. Experimental results indicate that the NMI increases monotonically with the degree of fatigue damage, and it can be used to quantify the accumulation of fatigue damage in specimens. The proposed nonlinear ultrasound modulation method facilitates the detection of fatigue damage and further assessment of the severity of the damage in aluminum alloy structures.
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