高强钢热冲压成形中高温损伤和开裂行为研究

项目名称： 高强钢热冲压成形中高温损伤和开裂行为研究

项目编号： No.51205116

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 机械工程学科

项目作者： 王敏

作者单位： 湖北汽车工业学院

项目金额： 25万元

中文摘要： 如何可靠地预测和控制高温损伤和开裂行为是实现高强钢热冲压精确成形亟需解决的关键基础问题。本项目拟以热冲压件开裂区的典型特征结构为研究对象，采用数值仿真、实验和理论解析有机结合的方法，建立考虑温度和形变率效应的高强钢高温开裂准则，开发嵌入高强钢高温开裂准则的用户材料子程序，确定适用于热冲压加载条件的高强钢高温开裂准则，从而建立高强钢热冲压成形中高温损伤和开裂行为的有限元预测方法；揭示该成形过程中高温损伤和开裂行为的特征及其与热力学控制参数之间的关联性；阐明成形参数及其耦合作用对高温损伤和开裂行为的影响规律和影响机制，建立高强钢热冲压成形中基于热力学控制参数的高温损伤和开裂行为的控制方法。这不仅为复杂热冲压件的损伤和开裂问题研究奠定基础，而且对提升该新技术在我国汽车产业中的制造水平具有重要的实用价值。

中文关键词： 高强钢；热冲压；损伤；开裂；有限元

英文摘要： How to accurately predict and control of damage and fracture behaviours at elevated temperature (DFBETs) is a key fundamental issue needed to be solved urgently in order to realize precise forming of high strength steel (HSS) during hot stamping. In the project, the typical characteristic structure in the fracture areas of hot-stamped parts is taken as object of study, and numerical simulation combined with expetiment and analytic theory is taken as method of study. The fracture criterion at elevated temperature (FCET) for HSS is established accounting for both temperatur and strain rate, the user material subroutine incorporating the FCET is developed, the FCET suitable for the loading condition of hot stamping is determined, and thus the finite element based method for prediting DFBETs in hot stamping of HSS is established; the characteristics of DFBETs and their relationships with thermodynamic control parameters (TCPs) are revealed; the effects of both forming parameters and their coupling on DFBETs are clarified, and the TCPs based method for controlling DFBETs is established. The study can not only provide a basis for the research on damage and fracture problems for complex hot-stamped parts, but also is of practical value for promoting the manufacturing level of the new technique in the Chinese automobile

英文关键词： high strength steel；hot stamping；damage；fracture；finite element