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TECHNICAL PAPERS

A Device for Evaluating the Multiaxial Finite Strain Thermomechanical Behavior of Elastomers and Soft Tissues

[+] Author and Article Information
E. M. Ortt, D. J. Doss, E. Legall, N. T. Wright, J. D. Humphrey

Department of Mechanical Engineering, University of Maryland, Baltimore, MD 21250

J. Appl. Mech 67(3), 465-471 (Dec 13, 1999) (7 pages) doi:10.1115/1.1311272 History: Received April 21, 1999; Revised December 13, 1999
Copyright © 2000 by ASME
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References

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Figures

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A schematic drawing of the overall experimental system
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Biaxial extension device. Panel (a) is an oblique view of the device where (1) camera, (2) load carriage, (3) environmental chamber, (4) heater, (5) Kevlar threads, (6) load frame, (7) motors, (8) motor supports, and (9) limit switches; in-plane directions defined as 1 and 2. Panel (b) is a schema of (1) the specimen with centrally placed tracking markers, (2) Kevlar threads, (3) T-bar, (4) coupling bar, (5) load cell, and (6) flashbulb and reflector, as seen from below.
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Stress relaxation curve of a neoprene rubber specimen during preconditioning
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Illustrative in-plane stretches λ1 and λ2 for computer controlled equibiaxial, proportional, and constant λ1 stretching protocols. Data are for three cycles each (cycle 1: +, 2: ▵, 3: ○), thus showing reproducibility and robust control.
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Typical Cauchy stress-stretch curves for neoprene at three temperatures for equibiaxial stretch tests
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Bottom surface temperature history for a one-dimensional flash test showing the close agreement between the measurements, the temperature history calculated as part of the data reduction, and that calculated assuming the boundary conditions originally used by Parker et al. 17 and the value of α33 determined by the Marquardt data reduction. τ1/2≈4 s.
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Temperature history of the central and one of the lateral thermocouples for equibiaxial in-plane stretch of λ=1.03. Solid line is model result.

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