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EXPERIMENTAL AND FINITE-ELEMENT STUDIES ON MODE-I AND MIXED-MODE (I AND II) STABLE CRACK-GROWTH .2. FINITE-ELEMENT ANALYSIS

DSpace at IIT Bombay

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Title EXPERIMENTAL AND FINITE-ELEMENT STUDIES ON MODE-I AND MIXED-MODE (I AND II) STABLE CRACK-GROWTH .2. FINITE-ELEMENT ANALYSIS
 
Creator MAITI, SK
MAHANTY, DK
 
Subject stress-strain field
brittle-fracture
ductile fracture
tip deformation
initiation
extension
criteria
mechanics
behavior
shear
 
Description Finite element studies are presented on both mode I and mixed mode stable crack growth under static loadings through an aluminium (D16AT) alloy. A COD based criterion has been used to predict the load-displacement diagram from initiation to instability. The theoretical predictions are compared with experimental results presented in Part I. Results on computed crack profiles, stress-strain distribution ahead of the crack tip, J integrals, J resistance curves, plastic zones, etc., are included. The study indicates that the load-displacement diagram associated with a mixed mode stable crack growth in a compact tension type of specimen geometry can be predicted reasonably accurately using the criterion of a fixed crack opening displacement at a finite distance behind the crack tip provided the crack is allowed to grow in the direction of initial growth in the finite element analysis. The crack assumes a more blunted profile in a mixed mode than in the mode I at all the stages of stable extension. The distributions of normal stress and strain in the direction perpendicular to the crack extension line, ahead of the current crack tip, have similarities between the mode I and mixed mode, irrespective of loading angle. Both the stress and strain levels increase as the crack extension proceeds. In a mixed mode, the J integral at the onset of crack extension is the lowest compared with the values at the later stages of the extension. Further, the tearing modulus associated with initial kinking is very small; it becomes close to the mode I values at the later stages. The tearing modulus remained approximately constant during the whole mode I stable growth and it had a similar trend subsequent to kinking in a mixed mode. The specific work of crack extension is zero as DELTA-a-->0 and it increases gradually with DELTA-a irrespective of the mode of loading; the actual variation depends on the loading angle. The plastic zone size grows as the stable extension progresses; the growth is approximately the maximum along the crack extension line.
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2011-08-24T08:33:50Z
2011-12-26T12:56:49Z
2011-12-27T05:46:06Z
2011-08-24T08:33:50Z
2011-12-26T12:56:49Z
2011-12-27T05:46:06Z
1990
 
Type Article
 
Identifier ENGINEERING FRACTURE MECHANICS, 37(6), 1251-1275
0013-7944
http://dx.doi.org/10.1016/0013-7944(90)90066-P
http://dspace.library.iitb.ac.in/xmlui/handle/10054/10821
http://hdl.handle.net/10054/10821
 
Language en