Q2/ At constant strain, about 7.6 Mpa of stress is used to a polymer. After 960 h, the stress reduced to 4.8 Mpa at 30 °C. When the same polymer is heated to 50 °C the relaxation time is 1200 h. 1-...

Extracted text: Q2/ At constant strain, about 7.6 Mpa of stress is used to a polymer. After 960 h, the stress reduced to 4.8 Mpa at 30 °C. When the same polymer is heated to 50 °C the relaxation time is 1200 h. 1- Estimate the relaxation time at 30 °C? 2- Estimate the stress after 1440 h and 30 °C? 3- Estimate the stress relaxation activation energy using the equation below: !=Cexp ) Where R = 8.314 j/mol. K, and C: constant %3D RT