The simulation for damage of metal powder compacts during forming
The main models of describe metal powder compacting are introduced in this paper. Based on a new model derived from Lee's metal powder compacting model and plastic theory for porous material, the scent of damage status of two-level flanged metal powder compacts during forming is simulated and the damage state and cracking process of compacts in different load process are followed up.
Numerical simulation of warm compacted synchronous pulley
为温暖的粉末压缩的一个新机械模型被介绍。基于铁的粉末的 Warmcompaction 过程被调查处理有弹性、塑料、热的种类的存在。A coupled 机械、热的模型基于椭圆体的收益标准和连续统理论被开发。组成的方程集成于组成的不可分的算术并且解决了采用增长反复的答案策略。铁粉末的流动压力模型线性地非根据单轴的温暖的压缩被适合。组成的模型被实现进 MSC.Marc 的用户子程序。与方程，开发的算法和节目，一个复杂同步滑轮的压缩过程被模仿。有不同穿孔机排水量的二个不同压缩计划被测试，相对密度分发被获得。有试验性的数据的比较证明绿协议的同质被压缩模式极大地影响。模拟结果同意实验很好。
Size Effects in a Slowly Sheared Granular Media
In this paper, we analyze the nature of stress distribution experienced by large particles in a dense granular media subjected to slow shearing, using the distinct element method. The particles were generated in a three-dimensional cuboidal periodic cell in which a large solid spherical particle was submerged (submerged particle) at the center of a bed of monodispersed spherical particles. The granular systems with different size ratio (i.e., the ratio of the diameter of submerged particle to that of the surrounding monodispersed particles) were subjected to quasi-static shearing under constant mean stress condition. The evolution of stress distribution in the submerged particle during shearing was carefully tracked down and presented here. The nature of stress distribution is bifurcated into two components, viz, (i) hydrostatic and (ii) deviatoric components. It has been shown that, for size ratio greater than c.a. 10, the nature of stress distribution in the submerged particle is hydrostatically dominant (increases the fluidity'). For smaller size ratios, the nature of stress distribution in the submerged particle is dominantly deviatoric.