爆轰加载下弹塑性固体Richtmyer-Meshkov流动的扰动增长规律

发布时间：2018-07-02 23:49

  本文选题：扰动增长 + 弹塑性固体　； 参考：《物理学报》2017年07期

【摘要】：研究了冲击波加载弹塑性材料扰动自由面的动力学演化过程,分析了高能炸药爆轰驱动时初始扰动与材料性质对扰动增长的影响.研究结果表明:初始扰动的振幅与波长之比越高,扰动越易增长,强度越高的材料扰动增长幅度越小;扰动增长被抑制时,尖钉的最大振幅与增长速度无量纲数之间存在线性近似关系,进一步理论分析表明尖钉的振幅增长因子与加载压力、初始扰动形态和材料强度有关,该理论关系作为扰动增长规律的线性近似在一定范围内适用于多种金属材料.
[Abstract]:The dynamic evolution process of the shock wave loaded elastoplastic material perturbation free surface is studied. The effects of initial disturbance and material properties on the disturbance growth are analyzed. The results show that the higher the ratio of the amplitude to the wavelength of the initial disturbance, the easier the disturbance increases, and the smaller the increase amplitude of the material disturbance is, when the disturbance growth is suppressed, There is a linear approximate relationship between the maximum amplitude of the spike and the dimensionless number of the growth rate. Further theoretical analysis shows that the amplitude growth factor of the nail is related to the loading pressure, the initial disturbance morphology and the material strength. As a linear approximation of the disturbance growth law, the theoretical relation can be applied to a variety of metal materials in a certain range.
【作者单位】： 北京理工大学机电学院;北京应用物理与计算数学研究所计算物理重点实验室;中国工程物理研究院研究生部;
【基金】：国家自然科学基金(批准号:11272064)资助的课题~~
【分类号】：O383
，

本文编号：2091415