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Question: a 400 psi stress is required to initially hold a...

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A 400 psi stress is required to initially hold a polymer specimen at a constant strain of 0.02. After 8 weeks at 20°C, the stress required to hold the 0.02 strain has been reduced to 350 psi. A similar test is conducted at 40°C, and after 8 weeks the initial 400 psi stress is found to have dropped to 240 psi as the specimen is continuously held at a strain of 0.02 Calculate the time constant, Lo, at both 20°C and 40°C S1

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