冲击相变对FeMnNi合金层裂行为影响研究  

INFLUENCE OF PHASE TRANSITION ON SPALLING BEHAVIOR IN FEMNNI ALLOY

作　　者：李庆忠[1] 陈永涛[1] 刘文韬[2] 胡海波[1] 徐永波[3] 

机构地区：[1]中国工程物理研究院流体物理研究所冲击波物理与爆轰波物理实验室,绵阳621900 [2]北京应用物理与计算数学研究所,北京100088 [3]中国科学院金属研究所材料科学国家实验室,沈阳110016

出　　处：《力学学报》2010年第5期971-977,共7页Chinese Journal of Theoretical and Applied Mechanics

基　　金：国家自然科学基金(10776032,10902102);中国工程物理研究科学发展基金(20060104,2009B0201014)资助项目~~

摘　　要：通过逆向加载和等厚对称碰撞实验相结合的方法,确定了FeMnNi合金含冲击相变和卸载逆相变的完整加卸载物理过程和对应加载状态的层裂特征.采用修正的Boettger模型与非平衡两相相变理论模型,成功模拟再现了实验过程,解释了冲击相变、卸载逆相变及卸载冲击波形成的物理机理.利用获得的冲击加卸载历程,从应力波相互作用的角度分析了等厚对称碰撞样品形成"异常"层裂的物理原因,指出层裂发生的机制正是由于受载样品发生了冲击相变和卸载逆相变.This paper provides an investigation of the phase transition and spalling characteristics induced by shock loading and unloading process in FeMnNi alloy through two symmetric impact experiments of same thickness and reverse impact technique.The experimental process is simulated successfully from the non-equilibrium two-phase model and the modified Boettger＇s model.The physical mechanisms of the shock phase transition and reverse transition as well as rarefaction shock wave formation are studied.A possible reason for the abnormal spalling phenomenon in the experiments is also discussed from the view of the interaction process of stress wave.It is found that the phase transition and reverse transition induced the spallation in the FeMnNi alloy samples.

关 键 词：FeMnNi 相变 逆相变 层裂 卸载冲击波 

分 类 号：O346.5[理学—固体力学]