用有限元法预测粉末体镦粗过程中的裂纹缺陷  

PREDICTION OF DEFECT DURING CYLINDRICAL UPSETTING OF POROUS MATERIALS BY FINITE ELEMENT METHOD

作　　者：张兴全[1] 李淼泉[1] 吴诗[1] 彭颖红[2] 阮雪榆[2] 

机构地区：[1]西北工业大学 [2]上海交通大学

出　　处：《航空学报》1997年第4期509-512,共4页Acta Aeronautica et Astronautica Sinica

基　　金：航空科学基金

摘　　要：以金属粉末体材料的塑性理论为基础，采用体积可压缩的刚塑性有限元法模拟粉末体材料的塑性变形过程。同时以Ｌｅｅ－Ｋｕｈｎ通过实验获得的局部应变极限准则为破裂条件，获得了在不同摩擦因子、高径比和初始相对密度条件下鼓形部位出现破裂的极限工艺参数。与Ｌｅｅ－Ｋｕｈｎ的实验结果比较表明：本文的预测方法不仅可行，而且其模拟计算结果可靠。In this paper, based on the plastic theory of porous metal materials, the deformation process of cylindrical upsetting of porous materials has been simulated by the compressible rigid plastic finite element method(FEM). Meanwhile, with the help of the local strain limit criterion obtained by Lee Kuhn′s experiments, the limit process parameters, which include the frictional coefficient (m) , the relative height (H/D) and the initial relative density( R 0 ), have been calculated for the cracking on surface. Compared with that of Lee Kuhn′s experiments, the calculated results show that the method proposed in this paper is not only applicable, but also reliable.

关 键 词：粉末体材料 锻造 缺陷预测 有限元 镦粗 

分 类 号：TG316.193[金属学及工艺—金属压力加工]