Fundamental Study on Ductile Fracture in Metal Forming

本课题研究的是挤压、锻造等金属成形过程中韧性断裂的科学技术问题。本课题的方法是考虑孔洞的形状变化和基体材料应变硬化能力的逐渐丧失。根据这一论点，概述了一个理论框架，以估计受任意三维有限变形的延性多孔材料的平均内部空洞矩阵构型。理论的发展将由实验程序支持，并将其纳入有限元程序。

This project deals with a scientifically and technically important problem, namely the study on ductile fracture in metal forming processes such as extrusion and forging. The approach in this project is to consider the shape change of voids and the progressive loss of strain hardening capability of the matrix material. Following that argument, a theoretical framework is outlined to estimate the average internal void-matrix configuration of the ductile porous material subjected to arbitrary three-dimensional finite deformation. The development of the theory will be buttressed by an experimental program and incorporating it into a finite element program.