Mean Shear Stress Effect for a Notch-Free Ductile Material Under Pure Cyclic Torsional Loads

[+] Author and Article Information
Shyh-Jen Wang

 Veterans General Hospital, Taipei, Taiwan, Republic of China; Institute of Bio-Engineering,  National Yang-Ming University, Taipei, Taiwan, Republic of China; and Department of Mechanical Engineering,  National Taiwan University of Science and Technology, Taipei, Taiwan, Republic of China

J. Pressure Vessel Technol 128(4), 667-669 (Jan 08, 2006) (3 pages) doi:10.1115/1.2349582 History: Received December 02, 2005; Revised January 08, 2006

The relationship of torque versus angle of rotation stabilizes after only a few cycles so that the alternating stress will become a constant as long as the maximum shear stress is less than the shear yield strength of the material. Using this information in Findley‘s fatigue criterion, it is demonstrated that the mean shear stress has very little influence on the fatigue limit of a notch-free ductile material under cyclic torsional loading.

Copyright © 2006 by American Society of Mechanical Engineers
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Grahic Jump Location
Figure 2

Typical torque-twist diagram

Grahic Jump Location
Figure 1

Failure criterion for pure cyclic torsional loads



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