# A stress of 1000 psi is applied to a polymerthat operates at a constant strain; after sixmonths, the stress drops to 850 psi. For aparticular application, a part made of thesame polymer must maintain a stress of900 psi after 12 months. What should bethe original stress applied to the polymerfor this application?

Question
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A stress of 1000 psi is applied to a polymer
that operates at a constant strain; after six
months, the stress drops to 850 psi. For a
particular application, a part made of the
same polymer must maintain a stress of
900 psi after 12 months. What should be
the original stress applied to the polymer
for this application?

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Step 1

Given data as per question

Stress applied on the polymer = 1000psi

After six-month stress drop = 850 psi

Writing expression for the stress in a polymer after t time.

Step 2
Step 3

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