Effect of Tensile-Mean-Strain on Plastic Strain Energy and Cyclic Response

[+] Author and Article Information
F. Ellyin

Department of Mechanical Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 2G8

J. Eng. Mater. Technol 107(2), 119-125 (Apr 01, 1985) (7 pages) doi:10.1115/1.3225786 History: Received July 17, 1983; Online September 23, 2009


Tests have been conducted to determine the effect of tensile-mean-strain on cyclic properties, low cycle fatigue, and total absorbed plastic strain energy to failure of ASTM A-516 Grade 70 carbon low alloy steel. Stable hysteresis loops at half-life are presented for different strain controlled tests. The cyclic properties were determined by a least squares fit technique. The results of tensile-mean-strain are compared with fully-reversed fatigue tests. The absorbed plastic strain energy per cycle was measured and compared with a proposed relationship for non-Masing material behavior. A relationship of the form Wf =KNf α is found to be a good representation of the data. It is observed that the material tends toward a steady-state condition independent of the level of the mean strain provided the fatigue life is greater than one thousand cycles.

Copyright © 1985 by ASME
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