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An alloy tie bar in a chemical plant has been designed to withstand a stress σ of 25 MN m-2 at 620C. Creep tests carried out on specimens of the alloy under these conditions indicated a steady


An alloy tie bar in a chemical plant has been designed to withstand a stress, σ, of 25 MN m-2 at 620C. Creep tests carried out on specimens of the alloy under these conditions indicated a steady-state creep rate, ε, of 3.1 x 10-12 σ-1. In service it was found that, for 30% of the running time, the stress and temperature increased to 30 MN m-2 and 650C. Calculate the average creep rate under service conditions. It may be assumed that the alloy creeps according to the equation

 

where A and Q are constants, R is the universal gas constant, and T is the absolute temperature. Q has a value of 160 kJ mol-1.

May 16 2020 View more View Less

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