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Fracture mechanics study of cracked pipe bends under internal pressure and bending moments

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Title Fracture mechanics study of cracked pipe bends under internal pressure and bending moments
 
Creator JOGLEKAR, MM
JOSHI, SG
DUTTA, BK
 
Subject limit loads
elbows
elastic-plastic fe analysis
j-integral
crack initiation load
effect of internal pressure
plastic collapse load
part-through cracked elbow
 
Description The present work attempts to investigate some aspects of the fracture behavior of cracked pipe bends under the action of in-plane bending moments, with and without internal pressure. The results of the elastic-plastic FE analysis of the defect free elbow under the action of in-plane opening and closing bending moments are presented with the emphasis on the hoop and axial stress distribution at various salient locations in the elbow. A severity matrix is outlined subsequently, correlating the various possible cracked configurations and the loading patterns. Parametric studies on the cracked elbows are carried out, in which the parameters, such as ratio of crack depth to elbow thickness (a/t), angle of the part-through wall crack, bend factor 'h' and the internal pressure 'P' are varied. The variations of the J-integral versus load and load versus load line displacement are presented. The crack initiation load is determined from the material specific critical value of the J-integral. A non-dimensional parameter is suggested as ratio of plastic collapse load to the crack initiation load, which increases with the increase in the internal pressure both in case of the throughwall flawed elbow as well as in the part-throughwall flawed elbow.
 
Publisher AMER SOC MECHANICAL ENGINEERS
 
Date 2011-10-26T13:37:08Z
2011-12-15T09:12:21Z
2011-10-26T13:37:08Z
2011-12-15T09:12:21Z
2006
 
Type Proceedings Paper
 
Identifier Proceedings of the 8th Biennial Conference on Engineering Systems Design and Analysis, Vol 4,89-98
978-0-7918-4251-5
http://dspace.library.iitb.ac.in/xmlui/handle/10054/16025
http://hdl.handle.net/100/2621
 
Source 8th Biennial Conference on Engineering Systems Design and Analysis,Turin, ITALY,JUL 04-07, 2006
 
Language English