A strip of elastomer was stretched in tension and elongation was held constant. After 10 min the tensile stress in the specimen dropped by 12%. Assuming that the elastomer behaves in accordance with the Maxwell model: • calculate the relaxation time (to the nearest whole number) (answer: τ = 78 min) • show that it takes 22 min for the stress to drop to 75% of its initial value.

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A strip of elastomer was stretched in tension and elongation was held constant. After 10
min the tensile stress in the specimen dropped by 12%. Assuming that the elastomer behaves
in accordance with the Maxwell model:
• calculate the relaxation time (to the nearest whole number) (answer: τ = 78 min)
• show that it takes 22 min for the stress to drop to 75% of its initial value.

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