项目名称： 复杂形状粉末冶金压坯裂纹损伤模型及防控方法研究

项目编号： No.51505483

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 机械、仪表工业

项目作者： 周蕊

作者单位： 中国民航大学

项目金额： 20万元

中文摘要： 粉末冶金技术已成为航空发动机和汽车关键零部件的优选制备技术。但生产高精度、形状复杂的零件压坯时，其裂纹的产生是粉末冶金工业一直需要解决的问题。目前粉末压坯的裂纹预测研究大多集中在定性分析，且缺乏考虑成形过程中各环节之间的相互影响和联系。为此，本项目拟基于广义塑性力学建立更精确的粉末成形力学模型与金属粉末压坯裂纹损伤模型，以及压坯裂纹损伤演化准则；以扩展有限元（X-FEM）分析方法为手段，实现复杂形状压坯全制备周期内裂纹损伤定量分析与预测，获得压坯裂纹损伤规律与极限工况参数；基于以上成果，提出压坯裂纹损伤防控方法，为粉末冶金零件设计、压制工艺设计和模具设计提供科学的参考依据。

中文关键词： 粉末冶金；压坯；裂纹；广义塑性力学模型；损伤演化准则

英文摘要： Powder Metallurgy(PM) has become preferred manufacturing technology on key components in the aeroengine and automotive manufacturin. But cracking is one of the critical concerns in the PM industry, especially with the increasing demand for comples shaped and high- performace parts. Currently, predict on crack in powder compacts are mostly concentrated in the qualitative analysis, as well as the lack of consideration in interaction and contact between the all phases during the forming process. And then, the project intends to establish a more accurate powder forming mechanical model based on the generalized plastic mechanics as well as metal powder compacts model crack damage model and damage evolution criterion. The quantitative analysis and prevention of cracks on complex green powder metallurgy compacts in all phases will performance by extend the finite element method (X-FEM). The cracks prevention methods in complex green powder compacts will proposed based on the crack formation law and limit working parameters. This research will provide scientific reference on designs of PM components, compaction process and die.

英文关键词： powder metallurgy;green compact;crack;generalized plastic mechanics model;damage evolution criterion