Micromechanics-based model for trends in toughness of ductile metals

被引：178

作者：

Pardoen, T

Hutchinson, JW

机构：

[1] Catholic Univ Louvain, PCIM, Dept Mat Sci & Proc, B-1348 Louvain, Belgium

[2] Harvard Univ, Div Engn & Appl Sci, Cambridge, MA 02138 USA

来源：

ACTA MATERIALIA | 2003年 / 51卷 / 01期

基金：

美国国家科学基金会;

关键词：

metals; fracture toughness; ductile; theory and modeling; voids;

D O I：

10.1016/S1359-6454(02)00386-5

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Relations between fracture toughness and microstructural details have been calculated for ductile materials based on a dilatational plasticity constitutive model that has recently been proposed. The model generalizes the Gurson model to account for both void growth and coalescence with explicit dependence on void shape and distribution effects. Based on a small scale yielding formulation of crack growth, toughness trends are determined as a function of yield stress, strain-hardening, initial porosity, void shape and spacing as well as void spacing anisotropy. Distinctions are drawn between the engineering fracture toughness, which is typically associated with 0.2 mm of crack growth, and the theoretical toughness based on coalescence of the crack tip with the first void ahead of it. Comparison with one set of experimental data for a steel is made for which a fairly complete characterization of the microstructure is available. (C) 2002 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.

引用

页码：133 / 148

页数：16

共 56 条

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