双金属复合材料界面结合超声传播有限元分析

Finite element analysis on ultrasonic propagation of interface bonding of bimetal composites

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 copper and aluminum bimetal composites are poorly bonded,the integrality and reliability of material will be greatly reduced,the quality inspection and evaluation of the copper and aluminum bimetal composites need to be strengthened.According to the characteristics of the copper and aluminum bimetal composites,the finite element models were established to simulate the ultrasonic propagation in the interface when it is well bonded,unbonded,and has unboned boundary,crack defect and inclusion defect. The snapshots clearly display the ultrasonic propagation in the interface under different conditions.The effect of different conditions on ultrasonic amplitude and phase was obtained by analyzing the A-scan echoes. The simulation results are in agreement with the theoretical and experimental results. The simulation shows that the finite element simulation method can properly display propagation of ultrasonic pulse wave in the copper and aluminum bimetal composites,and can provide some reference for ultrasonic nondestructive testing of the copper and aluminum bimetal composites.