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Experimental investigation on ductile stable crack growth emanating from wire-cut notch in AISI 4340 steel

DSpace at IIT Bombay

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Title Experimental investigation on ductile stable crack growth emanating from wire-cut notch in AISI 4340 steel
 
Creator MOURAD, AM
ALGHAFRI, MJ
ABU ZEID, OA
MAITI, SK
 
Subject fracture-behavior
brittle-fracture
criterion
initiation
geometry
deformation
temperature
cleavage
 
Description An experimental investigation on the stable crack growth (SCG) behaviour in AISI4340 using CT type specimen with a sharp slit (0.05 mm) under mode I and mixed modes (I and II) loading is presented. The slit was made in the specimen through wire cutting technique. Different combinations of loading angle 0 and ratio of original crack length to specimen width alpha(0)/M are examined. Data concerned with direction of initial crack extension, load-load line displacement (L-LLD) diagrams, initiation and maximum loads, range of stable crack growth, crack tip blunting, crack front geometry, fracture surfaces and their scanning electron micrographs are obtained. A noticeable blunting effect is observed prior to crack initiation. Although the crack initiates from a straight front, a considerable front tunnelling effect occurs as the crack extends. Under mixed mode, the crack extension takes place initially almost along a straight path, inclined with the main crack. The loading angle and initial crack length affect the initiation (P) and maximum (Pmax) loads significantly, but the ratio between P-max and Pi remains almost constant. The direction of initial stable crack extension due to mixed mode loading is determined throughout an elastic finite element analysis. There is a good agreement between the experimental and predicted results. (C) 2004
 
Publisher ELSEVIER SCIENCE SA
 
Date 2011-07-27T22:00:58Z
2011-12-26T12:58:31Z
2011-12-27T05:48:37Z
2011-07-27T22:00:58Z
2011-12-26T12:58:31Z
2011-12-27T05:48:37Z
2005
 
Type Article
 
Identifier NUCLEAR ENGINEERING AND DESIGN, 235(6), 637-647
0029-5493
http://dx.doi.org/10.1016/j.nucengdes.2004.10.005
http://dspace.library.iitb.ac.in/xmlui/handle/10054/7337
http://hdl.handle.net/10054/7337
 
Language en