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A simple model of stress intensity range threshold and crack closure stress

✍ Scribed by W.L. Morris; M.R. James; O. Buck

Publisher
Elsevier Science
Year
1983
Tongue
English
Weight
662 KB
Volume
18
Category
Article
ISSN
0013-7944

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✦ Synopsis

The cyclic stress intensity threshold (AKTH) below which cracks will not propagate varies with length for short cracks. A model is proposed which relates AK rH to the crack ClOSUre StreSS arkbIg from fracture surface roughness. This is used to predict a variation in AK TH with crack length for surface cracks in Ti 6AI-2Sn-4Zn-6Mo alloy, based upon measured values of crack opening displacement arising from roughness. The predicted variation in AK TH with crack length is found to be similar to that obtained from the empirical model of AKTH proposed by El Haddad et a/.[5]. The application of the new model to estimate the value of crack closure stress arising from crack tip plasticity for short surface cracks is also discussed.

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