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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/7812

Title: Mode II stable crack growth
Authors: MOURAD, AHI
MAITI, SK
Keywords: mixed-mode
fracture-behavior
brittle-fracture
aluminum-alloy
finite-element
toughness
temperature
specimen
steel
Issue Date: 1996
Publisher: FATIGUE & FRACTURE ENGINEERINGMATERIALS STRUCTURES LIMITED
Citation: FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES, 19(1), 75-84
Abstract: Mode II stable crack extension has been examined for an aircraft grade aluminium alloy D16AT. Both theoretical and experimental results are presented. The experimental observations include load displacement diagrams, plastic wake, crack front tunnelling and scanning electron micrographs of the fracture surfaces. The crack shows a tendency for in-plane extension, and the fracture surface is very Bat, smooth and free of any dimples. The crack front advances with negligible tunnelling at all stages of extension. The span of mode II stable crack growth (SCG) is longer than in the case of mode I SCG reported earlier for the same material and there is also more extensive plastic deformation. In the presence of a slight mode I load, the crack grows out-of-plane and the fractured surface facets resemble that of a mode I or mixed-mode dimpled fracture. The theoretical study is based on a finite element analysis using small deformation theory and incremental plasticity. Some of the experimental results have been theoretically predicted using the COA criterion as the governing criterion. The theoretical results include load-displacement diagrams, crack edge displacement curves, plastic zones and the J resistance curves. There is good agreement between the load-displacement diagrams. The initiation and maximum loads differ by less than 15%. The J resistance curve has a constant slope over the whole span of stable crack growth.
URI: http://dspace.library.iitb.ac.in/xmlui/handle/10054/7812
http://hdl.handle.net/10054/7812
ISSN: 8756-758X
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