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TECHNICAL BRIEFS

A Multi-Degree of Freedom System for Biomechanical Testing

[+] Author and Article Information
David N. Kunz, Ronald P. McCabe, Thomas A. Zdeblick, Ray Vanderby

Division of Orthopedic Surgery, Department of Mechanical Engineering, University of Wisconsin-Madison

J Biomech Eng 116(3), 371-373 (Aug 01, 1994) (3 pages) doi:10.1115/1.2895745 History: Received March 11, 1993; Revised February 14, 1994; Online March 17, 2008

Abstract

A system is described that allows axial, torsional, and bending testing of biomechanical specimens. The system uses electric motors under closed loop control in its grips allowing application of pure bending moments. These grips attach to an axial/torsional testing system. Thus, it provides simultaneous closed loop control of all three degrees of freedom (D.O.F), so that under any given test condition either the loads or the displacements for each D.O.F. can be maintained at zero, selected constant values, or simultaneously controlled. This enables the expedient evaluation of the mechanical behavior of biological structures under complex loadings or simple loadings (one D.O.F.) with no artificially induced constraints in the other two D.O.F.’s due to specimen mounting.

Copyright © 1994 by The American Society of Mechanical Engineers
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