“爆炸力学实验技术”专题出版前言

正爆炸力学或称爆炸与冲击动力学,主要研究爆炸现象的发生、发展规律和爆炸的力学效应。爆炸力学的研究领域主要涉及起点阶段爆炸瞬间爆炸波的产生与演化问题、中间阶段爆炸产生的冲击波或其他类型应力波在不同介质中的传播与演化问题、终点阶段爆炸或冲击作用下材料或结构的动力学响应问题;其属于流体力学、固体力学和物理学、化学之间的一门交叉学科,也是终点弹道学的研究基础之一。     

郑哲敏先生逝世周年纪念专刊序

<正>2022年8月25日是我刊原主编郑哲敏先生逝世一周年.郑哲敏先生(图1)是我国著名力学家,中国科学院院士、中国工程院院士、美国国家工程院外籍院士, 2012年度国家最高科学技术奖获得者.他创立了爆炸力学学科及相关的研究领域;领导了材料力学、非线性力学、海洋工程力学等学科的建设和发展;倡导了计算力学、流固耦合、非常规能源、人工智能等领域的研究,为我国现代力学的发展做出了重大贡献.     

“超高速碰撞”专题出版前言

正超高速碰撞是指这样一类碰撞:碰撞所产生的冲击压强远远大于(弹靶)材料的强度。在超高速碰撞的最初阶段,材料的性态类似于可压缩流体,遵从流体力学定律。小天体对地球的撞击、空间碎片对航天器的撞击、动能武器对目标的撞击是典型的超高速碰撞现象。     

On the mechanics of crystalline solids

Elastic-plastic constitutive behavior of cubic crystals (and aggregates) at large pressure is investigated taking account of a thermodynamic basis for lattice straining. Particular attention is directed to quasi-static processes in which an explicit Schmid law governing active slip systems is adopted. Connections between a precise normality rule and the pressure-dependence of moduli and critical shear strengths are analyzed and their implications assessed.     

Anisotropy degree of nonlinear solids

This research aims at the generalization of the concept of anisotropy degree of linearly elastic solids which has been defined and investigated in detail by Zhang [1988] to that of nonlinear and non-elastic solids. The properties of the anisotropy degrees defined here show that they are reasonable.     

Multi-field approach in mechanics of structural solids

We overview the basic concepts, models, and methods related to the multi-field continuum theory of solids with complex structures. The multi-field theory is formulated for structural solids by introducing a macrocell consisting of several primitive cells and, accordingly, by increasing the number of vector fields describing the response of the body to external factors. Using this approach, we obtain several continuum models and explore their essential properties by comparison with the original structural models. Static and dynamical problems as well as the stability problems for structural solids are considered. We demonstrate that the multi-field approach gives a way to obtain families of models that generalize classical ones and are valid not only for long-, but also for short-wavelength deformations of the structural solids. Some examples of application of the multi-field theory and directions for its further development are also discussed.