Liu Hongjun, Zhao Youxuan, Zhang Han, Deng Mingxi, Hu Ning, Bi Xiaoyang
College of Aerospace Engineering, Chongqing University, Chongqing 400044, China.
Chongqing Key Laboratory of Heterogeneous Material Mechanics, Chongqing University, Chongqing 400044, China.
Sensors (Basel). 2021 Mar 15;21(6):2061. doi: 10.3390/s21062061.
This study experimentally and numerically investigated the nonlinear behavior of the resonant bulk waves generated by the two-way collinear mixing method in 5052 aluminum alloy with micro-crack damage. When the primary longitudinal and transverse waves mixed in the micro-crack damage region, numerical and experimental results both verified the generation of resonant waves if the resonant condition ωL/ωT=2κ/(κ-1) was satisfied. Meanwhile, we found that the acoustic nonlinearity parameter (ANP) increases monotonously with increases in micro-crack density, the size of the micro-crack region, the frequency of resonant waves and friction coefficient of micro-crack surfaces. Furthermore, the micro-crack damage in a specimen generated by low-temperature fatigue experiment was employed. It was found that the micro-crack damage region can be located by scanning the specimen based on the two-way collinear mixing method.
本研究通过实验和数值模拟，研究了双向共线混合法在具有微裂纹损伤的5052铝合金中产生的共振体波的非线性行为。当初级纵波和横波在微裂纹损伤区域混合时，数值和实验结果均验证了如果满足共振条件ωL/ωT=2κ/(κ-1)，则会产生共振波。同时，我们发现声学非线性参数（ANP）随着微裂纹密度、微裂纹区域尺寸、共振波频率和微裂纹表面摩擦系数的增加而单调增加。此外，采用了低温疲劳实验在试样中产生微裂纹损伤。结果发现，基于双向共线混合法对试样进行扫描，可以定位微裂纹损伤区域。
