固体界面不稳定性的研究现状、应用及挑战  

Progresses,applications,and challenges of interface instability in solids

作　　者：陈涵 甘元超 彭建祥[1] 俞宇颖[1] 胡建波[1] CHEN Han;GAN Yuanchao;PENG Jianxiang;YU Yuying;HU Jianbo(National Key Laboratory of Shock Wave Physics and Detonation Physics,Institute of Fluid Physics,China Academy of Engineering Physics,Mianyang 621900,China)

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物理全国重点实验室,四川绵阳621900

出　　处：《力学进展》2024年第4期771-822,共52页Advances in Mechanics

基　　金：国家重点研发计划(2021YFB3802303);国家自然科学基金(12202421)项目资助.

摘　　要：固体界面的不稳定性增长是武器内爆物理、惯性约束聚变点火和材料动力学行为研究等工程和科学领域中的关键物理过程,它可能导致固体表面出现轻重介质相互侵入、物质微喷射乃至湍流混合等复杂的物理现象,对其发展规律的研究具有重要的意义.本文在第二、三章分别介绍了对固体界面Richtmyer−Meshkov(RM)和Rayleigh−Taylor(RT)不稳定性发展规律的研究现状,总结了现有的不稳定性增长理论模型并探讨了其局限性.与纯流体界面不稳定性增长所不同的是,由于固体材料存在强度,其界面不稳定性发展过程中扰动增长的部分能量会被强度这一耗散因素转化为晶格的热能,从而降低扰动增长速率乃至抑制扰动增长,因此如何衡量动态加载过程中固体的强度效应成为认识其不稳定增长规律的关键.另一方面,由于固体界面不稳定性的发展结果蕴含着材料的本构、状态方程等信息,人们提出可以应用不稳定性的增长规律来获取材料的动态屈服强度、校验材料的高压本构模型和抑制不稳定性的增长,本文在第四章中对这部分内容进行了介绍,并指出建立能精确描述不稳定性增长现象与材料性质间“关联性机制”的理论模型是成功进行应用的关键.在这些基础上,本文于第五章展望了该领域存在的机遇和挑战.The growth of interface instability in solids is a critical phenomenon affecting various fields of engineering and science,including implosion physics,inertial confinement fusion ignition,and the dynamic behavior of materials.This instability can lead to complex phenomena such as the interpenetration of light and heavy media at solid surfaces,material micro-jetting,and turbulent mixing,highlighting the significance of understanding its underlying mechanisms.This paper reviews the current research status of Richtmyer−Meshkov(RM)and Rayleigh−Taylor(RT)instabilities at solid interfaces in Chapters 2 and 3.We summarize existing theoretical models of instability growth and discuss their limitations.Unlike the instability growth observed in pure fluid interfaces,solid materials possess inherent strength,which enables some of the energy from perturbation growth to be transformed into lattice thermal energy through dissipative mechanisms.This energy conversion reduces the rate of perturbation growth and may even suppress the development of instabilities.Consequently,understanding the effects of material strength under dynamic loading conditions is crucial for comprehending instability growth behavior.Moreover,the outcomes of solid interface instability are indicative of various material properties,including constitutive relationships and equations of state.Researchers have proposed that instability growth can be leveraged to determine the dynamic yield strength of materials,validate high-pressure constitutive models,and mitigate instability growth.Chapter 4 focuses on this aspect,emphasizing the need to establish a theoretical model that accurately describes the“correlation mechanism”between instability phenomena and material properties for effective applications.Building on these foundations,Chapter 5 explores future opportunities and challenges in this field.

关 键 词：固体界面 RM不稳定性 RT不稳定性 扰动增长法 动态本构关系 

分 类 号：O38[理学—流体力学]