Biaxial Testing of Membrane Biomaterials: Testing Equipment and Procedures

[+] Author and Article Information
P. M. F. Nielsen, P. J. Hunter, B. H. Smaill

Department of Theoretical and Applied Mechanics, School of Engineering and Department of Physiology, School of Medicine, University of Auckland, New Zealand

J Biomech Eng 113(3), 295-300 (Aug 01, 1991) (6 pages) doi:10.1115/1.2894887 History: Received December 01, 1989; Revised December 27, 1990; Online March 17, 2008


A testing facility for measuring the biaxial mechanical properties of highly deformable membranes is described. Forces are applied, via strain-gauge force transducers, to four points on each side of an initially square 12 to 25 mm membrane sample to produce biaxial extensions of up to 80 percent of undeformed length. Strain is estimated from the displacement of markers bounding a 1 to 2 mm central square. The accuracy of stress and strain field measurements has been assessed by finite element analysis of a biaxially-loaded isotropic elastic membrane. Major advantages of the present system over those previously described in the literature are that 1) sample mounting procedures are simplified, 2) there is provision for independent adjustment of stress field uniformity and measurement of the applied point forces and 3) faster strain rates can be imposed on the relatively small samples tested.

Copyright © 1991 by The American Society of Mechanical Engineers
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