Fatigue Crack Growth Rate of Metal by Plastic Energy Damage Accumulation Theory
Publication: Journal of Engineering Mechanics
Volume 120, Issue 4
Abstract
The fatigue crack growth phenomenon is analyzed by means of postulated damage accumulation theory herein. By considering the plastic component of integral as a damage factor, the proposed damage accumulation theory successfully leads to a simple formula for the fatigue crack growth rate. This formula covers all three regions of the fatigue crack growth rate and shows a high potential in future application to different groups of materials. This research yields the following results: (1) The crack growth rate is not simply a function of , but a function of average local yielding strength, fracture toughness, and amplitude of the applied effective stress intensity factor in regions II and III; (2) the behavior of the fatigue crack growth rate (FCGR) near the threshold value is found to be dominated by maximum value of applied effective stress intensity factor instead of its amplitude; (3) the onset instability value of is a specimen geometrical‐dependent parameter; and (4) the average yielding local strength has a significant influence on the threshold value, that cannot be ignored when one studies the problem of the crack growth properties in region II. Test data reported were compared with the proposed formula and were found to be in reasonably good agreement.
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 120 • Issue 4 • April 1994
Pages: 776 - 795
Copyright
Copyright © 1994 American Society of Civil Engineers.
History
Received: Sep 16, 1992
Published online: Apr 1, 1994
Published in print: Apr 1994
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