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TECHNICAL BRIEFS

Long Bone Torsion: II. A Combined Experimental and Computational Method for Determining an Effective Shear Modulus

[+] Author and Article Information
J. G. Kennedy, D. R. Carter, W. E. Caler

Design Division, Mechanical Engineering Department, Stanford University, Stanford, Calif. 94305; and Rehabilitation Research and Development Center, Veterans Administration Medical Center, Palo Alto, Calif. 94304

J Biomech Eng 107(2), 189-191 (May 01, 1985) (3 pages) doi:10.1115/1.3138540 History: Received June 26, 1984; Revised December 07, 1984; Online June 15, 2009

Abstract

A technique is established which allows an effective torsional shear modulus to be determined for long bones, while remaining nondestructive to whole bone specimens. Strain gages are bonded to the diaphysis of the bone. Strains are then recorded under pure torsional loads. Theoretical stress predictions are combined with experimental strain recordings to arrive at a modulus value. Shear modulus calculations for four canine radii are reported using theoretical stress predictions from circular, elliptical and finite element models of the transverse bone geometry. The effective shear modulus, obtained from an average of the shear moduli determined at strain gage locations, serves to average the heterogeneous shear modulus distribution over the cross section. The shear modulus obtained is that associated with the “circumferential” direction in transverse planes.

Copyright © 1985 by ASME
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