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: 글Cor (을) Where R = 8.314 j/mol. K, and C: constant RT

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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
Transcribed Image 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
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