Simple Shear Testing of Parallel-Fibered Planar Soft Tissues

[+] Author and Article Information
John C. Gardiner, Jeffrey A. Weiss

Department of Bioengineering, The University of Utah, 50 South Central Campus Drive #2480, Salt Lake City, UT 84112

J Biomech Eng 123(2), 170-175 (Dec 01, 2000) (6 pages) doi:10.1115/1.1351891 History: Received January 01, 2000; Revised December 01, 2000
Copyright © 2001 by ASME
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A—Schematic of simulated simple shear test configuration. Sample is gripped with two clamps and the right clamp is displaced vertically to induce a shear κ=tan(θ), where θ is the angle between the x-axis and the top edge of the tissue. The coordinate axes illustrate the directions used to reference strain components, with the z-axis oriented out of the plane. B—Finite element mesh used for the 12×12 mm geometry. Four elements were used along the z-axis (out-of-plane) direction. Shaded regions indicate the areas of the tissue in the clamps.
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Regions of homogeneous Green-Lagrange strain distribution for sample dimensions of 12×12 mm (top row), 6×12 mm (middle row), and 12×6 mm (bottom row). Black areas indicate regions of strains that correspond to ±0.005 of the indicated center value. Clamping prestrain=10 percent, K=1.0e04 MPa, tan(θ)=1/3.
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Effect of specimen geometry on predicted Green-Lagrange components of shear (EXY) and normal (EXX) strain, as a function of shear angle applied to the clamps. Clamping prestrain=0 percent, K=1.0e04 MPa.
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Contours of Green-Lagrange strain and relative volume (V/V0) for sample dimensions of 12×12 mm (top row), 6×12 mm (middle row), and 12×6 mm (bottom row). Note that the entire sample undergoes nearly isochoric deformation regardless of sample dimensions. Clamping prestrain=10 percent, K=1.0e04 MPa, tan(θ)=1/3.




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