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RESEARCH PAPERS

Creep Crack Initiation and Propagation: Fracture Mechanics and Local Approach

[+] Author and Article Information
P. Bensussan

E.T.C.A., Arcueil, France

E. Maas

I.R.S.I.D. P.B. 29, Saint-Germain-en-Laye, France

R. Pelloux

M.I.T., Cambridge, Mass. 01239

A. Pineau

E.N.S.M.P. UA CNRS 866 P.B. 87, Evry, France

J. Pressure Vessel Technol 110(1), 42-50 (Feb 01, 1988) (9 pages) doi:10.1115/1.3265566 History: Received October 12, 1987; Online November 05, 2009

Abstract

Both the initiation and the propagation of macroscopic creep cracks have been studied in 316-L austenitic stainless steel, and, for comparison purposes, in 2219-T851 aluminum alloy. These alloys are, respectively, creep-ductile and creep-brittle. This difference in behavior is explained in terms of fracture mechanics concepts applied to creeping solids. The inability of fracture mechanics in providing unique correlations with K , C *, etc. . . for all the stages of both creep crack initiation and propagation is pointed out. Life prediction schemes using local rather than global fracture criteria are presented. A model based on creep ductility exhaustion concepts and the stress fields obtained by fracture mechanics is shown to provide good predictions for 316-L. Finite element analysis coupled to continuum damage mechanics is found to describe creep crack initiation in 2219-T851.

Copyright © 1988 by ASME
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