Calibration procedures for a computational model of ductile fracture

被引：126

作者：

Xue, Z. ^{[1
]}

Pontin, M. G. ^{[2
]}

Zok, F. W. ^{[2
]}

Hutchinson, J. W. ^{[1
]}

机构：

[1] Harvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 USA

[2] Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA

来源：

ENGINEERING FRACTURE MECHANICS | 2010年 / 77卷 / 03期

关键词：

Ductile fracture; Computational fracture; Shear fracture; Damage parameters; CRACK-GROWTH; VOID NUCLEATION; SHEAR; RUPTURE; DAMAGE; INTEGRATION; SIMULATION; PRESSURE; SHEETS; STRAIN;

D O I：

10.1016/j.engfracmech.2009.10.007

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

A recent extension of the Gurson constitutive model of damage and failure of ductile structural alloys accounts for localization and crack formation under shearing as well as tension. When properly calibrated against a basic set of experiments, this model has the potential to predict the emergence and propagation of cracks over a wide range of stress states. This paper addresses procedures for calibrating the damage parameters of the extended constitutive model. The procedures are demonstrated for DH36 steel using data from three tests: (i) tension of a round bar, (ii) mode I cracking in a compact tension specimen, and (iii) shear localization and mode II cracking in a shear-off specimen. The computational model is then used to study the emergence of the cup-cone fracture mode in the neck of a round tensile bar. Ductility of a notched round bar provides additional validation. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：492 / 509

页数：18

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