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铝/铜双金属材料界面结合不良时,会极大降低材料结构的完整性和可靠性,急需加强铝/铜复合材料的界面质量检测与评价。根据铝/铜双金属复合材料特点,建立有限元模拟模型,模拟分析当铝/铜界面为结合良好、未结合、未结合边界和界面有裂纹和夹杂时的超声波传播情况。通过波场快照图,清晰显示铝/铜界面不同情况下超声波传播情况;通过对回波A扫描信号分析,得到不同情况下铝/铜界面对超声波幅度、相位等的影响。模拟所得结果与理论和实验结果一致,说明应用有限元方法可以有效模拟超声波在铝/铜复合材料中的传播。通过数值模拟分析可以为铝/铜复合材料界面缺陷超声检测提供一定的参考。
When the interface of aluminum / copper bimetallic material is poorly bonded, the integrity and reliability of the material structure will be greatly reduced, and the interface quality inspection and evaluation of the aluminum / copper composite material is urgently needed to be strengthened. According to the characteristics of aluminum / copper bimetallic composites, a finite element simulation model was established to simulate the propagation of ultrasonic waves when the aluminum / copper interface was well bonded, unbound, unbound boundary and cracked and intercalated. Through the snapshot of the wavefield, the ultrasonic wave propagation under different conditions of the aluminum / copper interface is clearly shown. The influence of the aluminum / copper interface on the amplitude and phase of the ultrasonic wave under different conditions is obtained by analyzing the echo A-scan signal. The simulation results are consistent with the theoretical and experimental results, indicating that the application of finite element method can effectively simulate the ultrasonic wave propagation in aluminum / copper composites. Numerical simulation analysis can provide certain reference for ultrasonic testing of aluminum / copper composite interface defects.