铝合金薄壁方管轴向冲击变形及断裂行为研究  

DEFORMATION AND FRACTURE BEHAVIOR OF ALUMINUM ALLOY THIN-WALLED SQUARE TUBES UNDER AXIAL IMPACT

作　　者：孙宏图[1] 王健[1] 何士龙[1] 申国哲[2] 胡平[2] 

机构地区：[1]鲁东大学交通学院,烟台264025 [2]大连理工大学汽车工程学院,大连116024

出　　处：《机械强度》2016年第2期364-368,共5页Journal of Mechanical Strength

基　　金：国家自然科学基金重点项目(10932003);国家重点基础研究发展计划(973计划)项目(2010CB-832700)资助~~

摘　　要：对6016铝合金进行单向拉伸试验,分析不同应变速率对铝合金力学性能的影响,建立了6016铝合金Johnson-Cook本构模型及其断裂应变模型,并对铝合金薄壁方管轴向冲击载荷下的吸能特性进行分析,研究铝合金方管的壁厚、长度和冲击速度对其吸能特性的综合影响。结果表明,铝合金流动应力对应变率敏感性较低,但断裂应变对应变率具有一定的敏感性。在轴向冲击载荷下,铝合金薄壁方管出现渐进屈曲变形,具有较好的吸能特性。但随着厚度、长度和冲击速度的增加,铝合金方管容易出现混合变形模式,吸能特性有所降低。The tensile stress-strain response for 6016 aluminum alloy（ AA6016） sheet under different strain rates was presented in this paper. The data were fit to the Johnson-Cook constitutive model and fractured strain model. The energy absorbing performance of AA 6016 thin-walled square tubes under axial impact were analyzed. The results show that flow stress of AA6016 is insensitive to strain rate,while fractured strain is sensitive to strain rate. Thin-walled tubes show good energy absorbing performance with progressive buckling deformation under axial crushing. However,the energy absorbing performance decreases due to the mix buckling mode with the increasing thickness,length and impacting velocity of aluminum alloy thinwalled tubes.

关 键 词：铝合金 薄壁方管 变形 断裂 轴向冲击 

分 类 号：O313.4[理学—一般力学与力学基础]