Probabilistic Mesomechanical Fatigue Crack Nucleation Model

[+] Author and Article Information
R. G. Tryon, T. A. Cruse

Mechanical Engineering Department, Vanderbilt University, Nashville, TN 37235

J. Eng. Mater. Technol 119(1), 65-70 (Jan 01, 1997) (6 pages) doi:10.1115/1.2805975 History: Received April 16, 1995; Revised September 08, 1996; Online December 05, 2007


A probabilistic mesomechanical crack nucleation model is proposed to link the microstructural material heterogeneities to the statistical scatter in the macro structural response. The macrostructure is modeled as an ensemble of microelements. Cracks nucleate within the microelements and grow from the microelements to final fracture. Variations of the microelement properties are defined using statistical parameters. A micromechanical slip band decohesion model along with a Paris law crack growth model are used with first order reliability methods and Monte Carlo simulation to determine the distribution of fatigue life for the macrostructure. The modeled response is compared to trends in experimental observations from the literature.

Copyright © 1997 by The American Society of Mechanical Engineers
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