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Research Papers

Stress Relaxation of a Twaron® /Natural Rubber Composite

[+] Author and Article Information
N. V. David

Faculty of Mechanical Engineering, Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia

X.-L. Gao1

Department of Mechanical Engineering, Texas A&M University, 3123 TAMU, College Station, TX 77843-3123xlgao@tamu.edu.

J. Q. Zheng

Program Executive Office – SOLDIER, U.S. Army, Haymarket, VA 20169

1

Corresponding author.

J. Eng. Mater. Technol 133(1), 011001 (Nov 23, 2010) (9 pages) doi:10.1115/1.4002636 History: Received January 31, 2010; Revised May 13, 2010; Published November 23, 2010; Online November 23, 2010

The stress relaxation behavior of a Twaron CT709® fabric/natural rubber composite under a uniaxial constant strain is studied using three viscoelasticity models with different levels of complexity and a newly developed para-rheological model. The three viscoelasticity models employed are a one-term generalized Maxwell model (comprising one Maxwell element and an additional spring in parallel), a two-term generalized Maxwell model (including two Maxwell elements and an additional spring in parallel), and a four-parameter Burgers model. The values of the parameters involved in each model are extracted from the experimental data obtained in this study. The stress relaxation tests reveal that the stress starts to decay exponentially for a short duration and then continues to decrease linearly with time. It is found that the initial relaxation response of the composite is predicted fairly well by all of the four models, while the long-time stress relaxation behavior is more accurately predicted by the para-rheological model. The accuracy of each model in describing the stress relaxation behavior of the composite is quantitatively compared.

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Figures

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Figure 1

(a) Test setup and (b) stress and strain measured at a strain rate of 0.01 s−1 up to ε0=5%

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Figure 2

Experimental stress relaxation curve under ε0=5%

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Figure 3

Stress relaxation curves predicted by the three models and their comparison with the experimental data

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Figure 4

Para-rheological model

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Figure 5

Stress relaxation curves predicted by the para-rheological model and their comparison with the experimental data

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Figure 6

Stress relaxation modulus predicted by the four models and its comparison with the experimental data

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Figure 7

Normalized stress relaxation modulus predicted by the four models and its comparison with the experimental data

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Figure 8

Long-time stress relaxation response predicted by the four models

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