An elastomer band which would be utilized in packing purposes has a relaxation time of 40...

 

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An elastomer band which would be utilized in packing purposes has a relaxation time of 40 days at 25°C. (i) If the initial stress acting on this band is to be 5 MPa, how much time does it take for this band to drop its stress to 0.5 MPa? (ii) If the activation energy for relaxation is 30 kJ/mole at 25°C, what would be its relaxation time at 40°C? An elastomer band which would be utilized in packing purposes has a relaxation time of 40 days at 25°C. (i) If the initial stress acting on this band is to be 5 MPa, how much time does it take for this band to drop its stress to 0.5 MPa? (ii) If the activation energy for relaxation is 30 kJ/mole at 25°C, what would be its relaxation time at 40°C?