不同复合比7系多层铝合金摆锤冲击有限元模拟

Finite element simulation of pendulum impact on 7 series laminated aluminum alloy with different composite ratios

为了研究不同层组元复合比的7系多层铝合金复合材料在低速冲击载荷下的性能,利用ABAQUS对复合材料的冲击断裂行为进行了数值模拟。对单一705、706铝合金和不同复合比(706分别占705/706复合板的0.25、0.50、0.75和0.85)的7层铝合金进行摆锤冲击有限元模拟。结果表明:7层铝合金的断裂过程为韧-脆混合断裂,完全断裂需要的时间长于单一705、706铝合金;7层铝合金的冲击能量比706铝合金提高了42.44%~107.65%;7层铝合金中706所占的比例越大,可以抵抗的裂纹形成力越大,达到裂纹形成力的时间也越短;选取705、706和复合比为0.85的7层铝合金进行摆锤冲击实验,冲击能量与实验结果非常吻合,模拟和实验的宏观断口形貌基本一致,所建立的模型可以用来预测7系多层铝合金的摆锤冲击断裂行为。

In order to research the impact performance of 7series laminated aluminum alloy with different composite ratios subjected to low velocity impact,the impact of fracture behavior of composite plate was simulated by ABAQUS.Pendulum impact numerical simulation was carried out for single 705 and 706 aluminum alloy and 7-1ayer aluminum alloy with different compound ratios (for 705/706 composite, the percent of 706 is 0.25,0.50,0.75and 0.85,respectively).Results show that the fracture mode of 7-layer aluminum alloy is quasi -cleavage and dimple fracture,the time required for the complete fracture of 7-layer aluminum alloy is longer than that of 705and 706 single aluminum alloy.Compared with single 706 aluminum alloy,the impact energy of 7-layer aluminum alloy increases by 42.44%- 107.65%.The larger the proportion of 706 aluminum alloy in the 7-layer aluminum alloy is,the larger the resistance to crack formation is,and the shorter the crack formation time is.The impact energies of single 705 and 706 aluminum alloy and 7-layer aluminum alloy with composite ratio 0.85 are basically identical with the experiment results,and the macroscopic fracture morphology of simulation and experiment is basically consistent,thus the established models can be used to predict the pendulum impact behavior of 7series laminated aluminum alloy.