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RESEARCH PAPERS

Crack Initiation Under Low-Cycle Multiaxial Fatigue in Type 316L Stainless Steel

[+] Author and Article Information
B. Jacquelin, F. Hourlier, A. Pineau

Centre des Matériaux—Ecole des Mines de Paris, Evry Cédex, France

J. Pressure Vessel Technol 105(2), 138-143 (May 01, 1983) (6 pages) doi:10.1115/1.3264255 History: Received August 30, 1982; Revised December 03, 1982; Online November 05, 2009

Abstract

Low-cycle fatigue tests corresponding to fatigue life range between 103 and 105 cycles were carried out at room temperature on one heat of 316 L austenitic stainless steel. These tests included: (i) reversed tension-compression, (ii) reversed tension-compression with a superimposed steady torque, (iii) pulsated tension-compression with a stress ratio (R σ ) such that −0.5<R σ <0, (iv) reversed and pulsated tension-compression with a superimposed steady internal pressure. In tests (ii), the torsional ratcheting effect was measured. SEM observations were used to determine the number of cycles corresponding to Stage I crack initiation and the orientation of Stage I microcracks. It was observed that the in-depth growing Type B shear microcracks were most damaging. A simple criterion is proposed

Ni=Noγp B)α•(σnB)β
where N i is the number of cycles to crack initiation, Δγ p  B is the range of plastic shear strain on Type B planes, σn B is the maximum normal stress acting on these planes, N o ,α and β are parameters adjusted from the Manson-Coffin law and reversed cyclic stress-strain behavior.

Copyright © 1983 by ASME
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