【作者】 张虎生； 阎敏； 戴兰宏； 沈乐天；

【Author】 ZHANG Hu-sheng ,YAN Min ,DAI Lan-hong ,SHEN, Le-tian (State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, Anhui,China )

【机构】 中国科学院力学研究所非线性力学国家重点实验室；

【摘要】 本文采用组合飞片技术在轻气炮上实现了对LY12硬铝合金材料的加载-再加载和加载卸载,获得了LY12在不同预冲击状态下的一维平面应变波传播信息,利用Lagrange路径线法得到了对应状态下的应力应变曲线,进而采用上下屈服法得到了其在不同应力水平下的剪切强度。结果表明在低应力作用下,材料的剪切强度是不可忽略的,而且其随纵向应力的增加而增加。更多还原

【Abstract】 Loading-reloading and loading-unloading shock experiments of the LY12 aluminum alloy are conducted in a single stage light gas gun by composite flyers method. The stress profiles of uniaxial plane strain wave propagating in LY12 aluminum alloy specimens under different pre-shock states are measured. The stress-strain curves at corresponding states are computed by Lagrangian analysis method which is path lines method. The shear strengths in different stress level are obtained by self-consistent method.. The results show that under the shock of lower stress the shear strength of material can not be ignored and it increase with the increasing of the longitudinal stress.更多还原