内爆炸载荷作用下7A55铝合金的动态性能及断裂行为  

Dynamic properties and fracture behaviors of 7A55 aluminum alloy under explosive loading

作　　者：李忠盛[1,2] 吴护林[2] 陈韵如[1,3] 易同斌[2] 李立[2] 潘复生[1] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400030 [2]中国兵器工业第五九研究所,重庆400039 [3]重庆理工大学图书馆,重庆400054

出　　处：《爆炸与冲击》2012年第2期190-195,共6页Explosion and Shock Waves

基　　金：重庆市科技攻关计划项目(2009AC4015)

摘　　要：采用圆筒爆炸实验研究了内爆炸载荷作用下7A55铝合金的动态性能,用扫描电镜和光学显微镜对破裂样品的断口形貌、金相组织等进行了微观分析。结果表明:在本文实验条件下,7A55铝合金能够承受360 MPa的内部爆炸加载;合金的断裂方式为剪切断裂,裂缝与筒壁的径向近似成45°角;靠近圆筒内侧组织中存在剪切变形带、绝热剪切带和裂纹,沿最大剪切应力面向外扩展。A series of cylinder tests were carried out to determine the dynamic properties of 7A55 aluminum alloy subjected to internal explosive loading.The fracture morphology and microstructure of the disruptive specimen were analyzed using the scanning electron microscopy and the optical microscope.The results show that the internal explosive loading,which 7A55 aluminum alloy can bear,is 360 MPa on the experimental conditions.The 7A55 aluminum alloy cylinder under explosive loading may undergo shear fracture,and the crack in the cylinder specimen and the radial direction of the cylinder wall lie at an angle of about 45 degrees.The deformation band,adiabatic shear bands and cracks can be found in the microstructure of the inner wall,which spread along the maximum shear stress plane.

关 键 词：固体力学 动态性能 爆炸载荷 7A55铝合金 断裂行为 绝热剪切 

分 类 号：O346.1[理学—固体力学] TG146.1[理学—力学]