3D application of the coupled criterion to crack initiation prediction in epoxy/aluminum specimens under four point bending

被引：41

作者：

Doitrand, Aurelien ^{[1
]}

Leguillon, Dominique ^{[2
]}

机构：

[1] Safran Aircraft Engines, F-77550 Rond Point Rene Ravaud, Moissy Cramayel, France

[2] UPMC Univ Paris 6, Sorbonne Univ, Inst Jean le Rond dAlembert, CNRS UMR 7190, F-75005 Paris, France

来源：

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES | 2018年 / 143卷

关键词：

Bending; Bimaterial; Crack; Energy release rate; Fracture; FINITE FRACTURE-MECHANICS; ENERGY CRITERION; STRENGTH PREDICTION; ONSET; STRESS; COMPOSITES; NUCLEATION; TOUGHNESS; FAILURE; TENSILE;

D O I：

10.1016/j.ijsolstr.2018.03.005

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

Until now, the coupled stress and energy criterion has mainly been used in 2D applications, but it is possible to extend it to a 3D case. Herein the crack initiation in epoxy/aluminum bimaterial specimens under four point bending is predicted through a 3D numerical application of the coupled criterion. The stress and the energy conditions are computed by means of 3D finite element modeling of both undamaged and cracked specimens. The crack initiates at the epoxy/aluminum interface, meshes of the cracked specimens take into account the crack topology which is determined using the interface normal stress isocontours. By indirect confrontation to experimental tests on aluminum/epoxy bimaterial specimens of different width, the proposed approach allows determining the interface strength and fracture energy. The blind application of the proposed method to a crack initiation in aluminum/epoxy/aluminum specimens of different epoxy layer thickness under four point bending leads to a reasonable agreement with experimental data. (C) 2018 Elsevier Ltd. All rights reserved.

引用

页码：175 / 182

页数：8

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