Stress intensity factors for cracks close to the interface between dissimilar materials

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Stress intensity factors for cracks close to the interface between dissimilar materials

 

Author: Pun, Hon-nang
Title: Stress intensity factors for cracks close to the interface between dissimilar materials
Degree: M.Sc.
Year: 2000
Subject: Welded joints -- Cracking
Strains and stresses
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Dept. of Mechanical Engineering
Pages: xiv, 64, [20] leaves : ill. ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1532185
URI: http://theses.lib.polyu.edu.hk/handle/200/4118
Abstract: In most practical cases in which the crack runs close to but not exactly at the interface, a direct solution for the conventional stress intensity factors is difficult. But the determination of the corresponding complex stress intensity factor, K, for the interface crack is quite straightforward. However, critical stress intensity factor values exist only in the conventional form of K. In this research, the values of the conventional stress intensity factors of a crack which is close to the interface of dissimilar materials but not on the interface were determined and used to verify the relationship between such values and the corresponding complex stress intensity factor for a four-point bend model. The mode I (opening mode) and mode II (sliding mode) stress intensity factors, KI and KII, were determined by an iterative computational method using a semi-infinite-crack model. Such stress intensity factors are representative of stress magnitudes associated with each mode of loading. Also, the complex stress intensity factor, K (where K = K1 + iK2 as i2 =-1) associated with the corresponding problem for the crack lying on the interface can be determined by using the crack surface displacement (CSD) and finite element analysis (FEA). The applicability of this relationship between the conventional stress intensity factors and complex stress intensity factor as the distance between the crack and the interface varies is also discussed.

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