RESEARCH PAPERS: Reliability, Stress Analysis, and Failure Prevention

Design with Nonhomogeneous Materials—Part II: Torsion of Thin-Walled Prismatic Bars

[+] Author and Article Information
V. K. Stokes

General Electric Company, Corporate Research and Development, Schenectady, New York 12301

J. Vib., Acoust., Stress, and Reliab 109(1), 87-91 (Jan 01, 1987) (5 pages) doi:10.1115/1.3269400 History: Received September 02, 1986; Online November 23, 2009


Theories have been developed for the torsion of nonhomogeneous thin-walled prismatic bars of open section and thin-walled tubes. The mechanical response of these members has been shown to be equivalent to the corresponding homogeneous case with the modulus of rigidity replaced by a suitable average of the variable rigidity modulus of the material. These average moduli, which are different for each geometry, are shown to be moments of the variable modulus of the nonhomogeneous material. Interpretations for the average moduli, which would be determined by torsion tests on nonhomogeneous materials, have been considered.

Copyright © 1987 by ASME
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