Possible Experimental X-Ray Diffractometry Evidence of Couple-Stresses

[+] Author and Article Information
M. M. Gola

Dip. di Meccanica, Politecnico di Torino, Torino, Italy 10129

P. Coppa

Dip. Ing. Meccanica, Universitá “Tor Vergata,” Roma, Italy

J. Appl. Mech 55(3), 539-544 (Sep 01, 1988) (6 pages) doi:10.1115/1.3125827 History: Received May 08, 1987; Revised October 26, 1987; Online July 21, 2009


The technique of measuring residual strain using X-ray diffractometry is examined with respect to prior attempts to experimentally validate couple-stress or micropolar theories. When subjected to grinding, polycrystalline materials (such as steel or others of technical interest) exhibit residual strains with very peculiar features whose explanation is still controversial. This paper suggests how a formally correct explanation can be formulated in terms of the theories based on couple-stresses. This new hypothesis is critically compared with competing theories found in the recent literature. It is proposed that, for the case of thin layers subjected to extremely high stress gradients, X-ray diffractometry is the most appropriate technique for investigating couple-stress or micropolar phenomena.

Copyright © 1988 by ASME
Topics: X-rays , Stress , Steel , Grinding
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