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RESEARCH PAPERS

Fatigue Crack Propagation Rates for Duralumin in Simple Bending

[+] Author and Article Information
P. J. Cain, R. Plunkett

Department of Aerospace and Engineering Materials, University of Minnesota, Minneapolis, Minn.

T. E. Hutchinson

Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minn.

J. Eng. Mater. Technol 97(2), 179-186 (Apr 01, 1975) (8 pages) doi:10.1115/1.3443279 History: Received January 18, 1974; Revised August 20, 1974; Online August 17, 2010

Abstract

Flat sheet stock of 2024-T3 Duralumin was tested for fatigue crack propagation in simple bending. Transcrystalline cracking was observed at a rate proportional to stress intensity factor squared at low levels where the plastic zone is less than grain size. A mixture of trans-and-intercrystalline cracking was observed at a rate proportional to stress intensity factor to the fourth power at high levels where the plastic zone is larger than grain size. A strain redistribution mechanism giving constant stress intensity factor through the thickness is postulated. The combination of strain redistribution in bending and change of mechanism with plastic zone size leads to a macroscopic behavior which is different from that previously reported for simple tension, particularly in mild steel.

Copyright © 1975 by ASME
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