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TECHNICAL PAPERS

Observations of the Constitutive Response and Characterization of Filled Natural Rubber Under Monotonic and Cyclic Multiaxial Stress States

[+] Author and Article Information
W. V. Mars

Cooper Tire and Rubber Company, 701 Lima Ave., Findlay, Ohio 45840

A. Fatemi

The University of Toledo, 2801 W. Bancroft Street, Toledo, Ohio 43606

J. Eng. Mater. Technol 126(1), 19-28 (Jan 22, 2004) (10 pages) doi:10.1115/1.1631432 History: Received December 09, 2002; Revised August 01, 2003; Online January 22, 2004
Copyright © 2004 by ASME
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References

Figures

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Simple tension, planar tension, and equibiaxial tension test specimens, with corresponding stretch and stress states
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Section view of axial/torsion test specimen
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Axial-torsion loading path designations. δ=displacement,θ=twist.
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Axial-torsion experimental matrix in terms of peak axial and shear engineering strains
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Axial-torsion experimental matrix in terms of peak principal engineering strains
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Monotonic stress-strain curves in simple tension, planar tension, and equibiaxial tension
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Cyclically stable stress-strain curves in progressively increasing simple tension (a), planar tension (b), and equibiaxial tension (c), and comparison of best-fit Neo-Hookean model to curves in simple and equibiaxial tension (d)
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Axial and shear engineering stress amplitude evolution with cycles for R=0, proportional loading with 3.9°/mm, path D
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Cyclically stabilized axial and shear stress-strain curves under R=0, proportioning loading with 3.9°/mm, path D. For comparison, the pure axial, pure torsion, and proportional monotonic stress-strain curves are superimposed.
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Axial and shear engineering stress amplitude evolution with cycles, path H
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Cyclically stabilized axial and shear stress-strain curves for path H. For comparison, the pure axial, pure torsion, and proportional monotonic stress-strain curves are superimposed.
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Combined axial-torsion strain and stress paths associated with phase angles of ϕ=0 deg (path D), ϕ=45 deg (path G), ϕ=90 deg (path H) and ϕ=180 deg (path I).
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Evolution of axial-torsion stress paths for phase angles of ϕ=0 deg (path D), ϕ=45 deg (path G), ϕ=90 deg (path H), and ϕ=180 deg (path I).
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Effect of strain component phase difference on stabilized axial and shear stress-strain curves. ϕ=0 deg for path D, ϕ=90 deg for path H, and ϕ=180 deg for path I.
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Shear engineering stress amplitude evolution with cycles, showing the effect of an initial overload in path B (specimens 180 and 181). The evolution of the no-overload case is also shown (specimen 183). Following the initial overload, all tests were run at the same displacement amplitude.

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