Mean Strain Effect on Crack Initiation Lives for Notched Specimens Under Biaxial Nonproportional Loading Paths

[+] Author and Article Information
Ming-Chuen Yip, Yi-Ming Jen

Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu 30043, Taiwan

J. Eng. Mater. Technol 119(1), 104-112 (Jan 01, 1997) (9 pages) doi:10.1115/1.2805962 History: Received July 23, 1995; Revised September 22, 1996; Online December 05, 2007


This paper discusses the mean strain effect on the crack initiation lives for notched specimens under biaxial nonproportional loading paths. Elastic-plastic finite element method was used to evaluate the local stresses and strains. Several prediction models related to the mean stress/strain effect were employed to correlate the experimental results with reference fatigue data for smooth specimens. It is found that Fatemi-Socie model gives good prediction for the present research with the assistance of finite element method. The stress behavior in this deflection-controlled tests is discussed in this study, and the failure surfaces are also examined after tests.

Copyright © 1997 by The American Society of Mechanical Engineers
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