An elastomer was suddenly stretched in tension and the


An elastomer was suddenly stretched in tension and the elongation was held constant. After 10 min, the tensile stress in the polymer dropped by 12%. After an extremely long time the stress dropped to 48% of its original value.

A. Find the relaxation time, τ , for stress relaxation.

B. How long will it take the stress to drop to 75% of its initial value?

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Mechanical Engineering: An elastomer was suddenly stretched in tension and the
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