A crack perpendicular to a bimaterial interface an interface in finite solid

Document type: Journal Articles
Article type: Original article
Peer reviewed: Yes
Author(s): S.H. Chen, Tzuchiang Wang, Sharon Kao-Walter
Title: A crack perpendicular to a bimaterial interface an interface in finite solid
Journal: International Journal of Solids and Structures
Year: 2003
Volume: 40
Issue: 11
Pagination: 2731-55
ISSN: 0020-7683
Publisher: Elsevier, UK
URI/DOI: 10.1016/S0020-7683(03)00087-8
ISI number: 000182889200007
Organization: Blekinge Institute of Technology
Department: Dept. of Mechanical Engineering (Institutionen för maskinteknik)
Dept. of Mechanical Engineering S-371 79 Karlskrona
+46 455 38 50 00
http://www.ima.bth.se/
Authors e-mail: skw@bth.se
Language: English
Abstract: The dislocation simulation method is used in this paper to derive the basic equations for a crack perpendicular to the bimaterial interface in a finite solid. The complete solutions to the problem, including the T stress and the stress intensity factors are obtained. The stress field characteristics are investigated in detail. It is found that when the crack is within a weaker material, the stress intensity factor is smaller than that in a homogeneous material and it decreases when the distance between the crack tip and interface decreases. When the crack is within a stiffer material, the stress intensity factor is larger than that in a homogeneous material and it increases when the distance between the crack tip and interface decreases. In both cases, the stress intensity factor will increase when the ratio of the size of a sample to the crack length decreases. A comparison of stress intensity factors between a finite problem and an infinite problem has been given also. The stress distribution ahead of the crack tip, which is near the interface, is shown in details and the T stress effect is considered.
Subject: Mechanical Engineering\General
Mechanical Engineering\Structural Mechanics
Keywords: crack-edge stress field analysis, edge dislocations, interface structure, internal stresses
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