爆轰驱动铝飞层扰动增长的数值模拟（英文）  

Numerical Investigations of Perturbation Growth in Aluminum Flyer Driven by Explosion

作　　者：王涛[1,2] 柏劲松[1] 曹仁义[1] 汪兵[1] 钟敏[1] 李平[1] 陶钢[2] WANG Tao;BAI Jingsong;CAO Renyi;WANG Bing;ZHONG Min;LI Ping;TAO Gang(Institute of Fluid Physics, CAEP ,Mianyang 621999, China;School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, China)

机构地区：[1]中国工程物理研究院流体物理研究所,四川绵阳621999 [2]南京理工大学能源与动力工程学院,江苏南京210094

出　　处：《高压物理学报》2018年第3期16-26,共11页Chinese Journal of High Pressure Physics

基　　金：Science Challenge Project(TZ2016001);National Natural Science Foundation of China(11372294,11532012,11672277)

摘　　要：建立了研究炸药爆轰驱动条件下金属材料Rayleigh-Taylor不稳定性问题的实验技术和数值模拟方法。利用该实验技术和数值模拟方法研究了炸药爆轰驱动条件下,铝飞层界面Rayleigh-Taylor不稳定性增长规律,数值模拟显示界面扰动振幅以指数规律增长。数值模拟结果和实验定性相符,但是定量相比有较大差别,原因是高压高应变率加载条件下铝的强度增强,而数值模拟时所采用的SG本构模型在这样的加载条件下低估了铝的强度而导致对扰动增长致稳作用不足。然后在数值模拟中,通过改变材料的初始剪切模量和初始屈服强度,发现在一定范围内,初始剪切模量对材料动态屈服强度没有影响,而初始屈服强度增大可以明显提高材料的动态屈服强度,达到抑制扰动增长的目的,表明材料屈服强度主导界面扰动增长。In this paper we developed an experimental technique and numerical simulation method that we then adopted to investigate the Rayleigh-Taylor instability in metallic materials driven by explosion.We studied experimentally and numerically the growth of the Rayleigh-Taylor instability in an explosion-driven aluminum flyer and showed that the perturbation amplitude growth follows an exponential law over time.The numerical results agree with the experiment qualitatively,but not quantitatively.This is because the aluminum strengthens under high pressure and at high strain rate,and the Steinberg-Guinan constitutive model used in the simulations underestimates the strength of the aluminum as being not great enough to suppress the perturbation growth.By investigating numerically the effects of the initial shear modulus and the initial yield strength on the development of the Rayleigh-Taylor instability of the metallic material,we also found that the initial shear modulus in a specified range does not affect the dynamic yield strength and the increase in the initial yield strength can improve the dynamic yield strength significantly to stabilize the perturbation growth.In other words,the material strength dominates the interface perturbation growth.

关 键 词：爆轰驱动 RAYLEIGH-TAYLOR不稳定性 扰动增长 材料强度 致稳 

分 类 号：O33[理学—一般力学与力学基础] O344.3[理学—力学]