Lerr is obtained through tracing the variety of elastic energy density of each element and recording the maximal fluctuation when brittle failure happens during numerical calculation 该指标的实现是通过在数值计算中追踪每个单元弹性能量密度变化的全过程，记录单元发生脆性破坏前后的弹性能密度差值，得到单位体积岩体突然释放的弹性能量。
The glass transition temperature ( tg ) of most polymers appears at either low temperature below room temperature ( such as rubber ) , or high temperature above room temperature ( such as plastics ) , which are not suitable for practical application 由于高聚物的减振阻尼性能在很大程度上依赖于高聚物的粘弹性能，从而大大限制了高聚物减振材料的应用范围。
The reason is that the elastic energy increases the nucleation work while the formation of primary martensite can excite the release of elastic energy in austenite to promote the formation of after martensite and intensify the tendency towards homogeneous nucleation 其原因是弹性能的存在增大了初生马氏体的形成功，而初生马氏体的形成则会激发奥氏体内弹性能的释放，弹性能的释放可促进继生马氏体形成，并增大其均匀形核倾向。
This general formula can describe not only the releasing process of elastic energy in gas reservoir but also the material balance phenomenon caused by the retrograde condensation in gas reservoir and it can be simplified as the material balance equations of condensate gas reservoirs under several special cases , thus providing a effective means for the performance analysis and prediction of condensate gas reservoir development 该凝析气藏物质平衡方程通式既能描述气藏弹性能的释放过程，又能描述气藏反凝析引起的物质平衡现象，并可简化为几种特例下凝析气藏的物质平衡方程，为凝析气藏开发动态分析及预测提供了一种有效的手段。
With the material dynamic constitutive equation including damage and the effect of stain rate the predictable formula about ballistic limit velocity of fiber composite target . secondly based on the damage feature about ceramic / fiber composite target caused by impact load , analysis model about defense performance of ceramic / composite material target is formed and the predictable formula about ballistic limit velocity is also given . lastly using the reflection and projectile theory of stress wave the paper discusses the design of ceramic / composite material target , optimizes the design of double layer ceramic / composite targets , gains optimal coefficient under certain area density and discusses the variety relationship of area density and thickness with optimal coefficient u nder some ballistic limit velocity 3 首先，分析了纤维类正交铺层复合靶板在冲击载荷作用下的损伤破坏机理，结合包含损伤和应变率效应的材料动态本构方程，建立了纤维复合材料板弹道极限速度的预测公式；其次，根据陶瓷/纤维材料复合靶板在冲击载荷下的破坏特点，建立了陶瓷/复合材料靶板抗弹性能分析模型，给出了弹道极限速度预测公式；最后，利用应力波反射和透射理论讨论了陶瓷/复合材料靶板的设计问题，对双层陶瓷复合靶板的优化设计进行了分析，给出了在一定面密度下的最佳优化系数，讨论了一定弹道极限速度下的面密度和厚度随优化系数的变化关系。
According to the minimum principle in energy , we analyze the microcosmic mechanism of magnetic domain construction and the main factor that affect the shape , size and connecting of the magnetic domain etc . from the microcosmic mechanism of ferromagnet , we analyze how stress influence the magnetic domain and magnetic domain wall , and discover the increase of stress energy and magnetism elasticity energy which destroy the balance of system energy make up the influence of magnetic domain structure , then set up basic disciplinarian between stress and characteristic of magnetism 同时根据能量最小原理，从理论上分析了磁畴结构存在的微观机理以及影响磁畴结构运动、变化的主要因素，得出了应力的存在将影响磁畴的形状、大小和搭配方式等结论。从铁磁晶体的微观机理出发，研究了应力对磁畴和磁畴壁的影响，发现应力影响磁畴结构的本质是由于应力的作用使得铁磁晶体增加了应力能和磁弹性能，体系为了达到新的平衡，导致了磁畴结构变化，并研究了应力与铁磁晶体磁特性之间的基本规律。
During the past years a great deal of interest has been devoted to the study of ceramic composite armor due to the application in defense , in the light of recent work of ceramic / composite armor the dissertation provides the defensible performance of ceramic / metal , ceramic / non - metal light armor and multi - layer ceramic composite armor and its optimization design . at one time , it motives us to study the smash mechanism of ceramic facet plate under the effect of impact load and to analyzed different defensible performance from homogeneous armor 本文针对陶瓷复合装甲的研究现状，深入系统地研究了陶瓷/金属、陶瓷/非金属轻型装甲和陶瓷多层复合装甲的抗弹性能及优化设计，同时研究了在冲击载荷作用下陶瓷面板的破碎机理，对陶瓷复合装甲不同于均质装甲的抗弹性能进行了分析。
As an important component in laminated composites , the foamed polymer material ( polyurethane foam , puf ) is also studied in this paper . the viscoelastic property ' s influence on absorption property is studied by fem , and the relationship between the macroscopical physical properties and the absorption property is researched by experiment 另外对作为层合复合降噪材料重要组份之一的高聚物发泡材料( puf )的吸声性能进行了探讨，通过有限元方法模拟其粘弹性能对吸声性能的影响，并实验研究了其宏观物理表征与吸声性能的关系。
In this paper , we study this problem by means of finite elements method . the main results as follow : ( 1 ) there is a discontinuity of the director field at the plate interfaces of the tile angle antisymmetric strong anchor nlc cell due to the presence of the kn surfacelike elastic term . the distribution of the director change regularly with different k ^ 当考虑表面弹性能项k _ ( 13 )项( k _ ( 13 ) 0 )时，得出的主要结果如下： ( 1 )在强锚定条件下，得到上下基板的倾角反对称向列相液晶盒系统中的指向矢分布曲线，曲线在边界处发生了很大的形变。
With the development of defense - tank weapon and the appearance of new - style weapon , the higher request for tank - armor has been put forward , which not only has the superior performance of defense - bullet , but also has the performance of light - weight , high - maneuverability , defense - fragments , defense - nucleus and so on 随着反坦克武器威力增强和特种武器出现，对坦克装甲车辆提出了更高的要求，不仅要具备优良的抗弹性能，还要具有轻量化、高机动性、防碎片、防核辐射等防护性能。
