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  3. b the results of creep rupture tests on a sheet...

Question: b the results of creep rupture tests on a sheet...

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(b) The results of creep rupture tests on a sheet of Poly(methyl methacrylate) (PMMA) at 20°C can be idealised to obey a law of the form: Bơ where, tris the time to failure in seconds, and σ is in MPa. From the results A was found to be 1.33 x 1014s, and B-0.404 MPa1 Page 3 of 8

Using these values for A and B and in conjunction with Bueche equation, calculate the stress to years if the in-service temperature was set at 55°C. the Zhurkov and 4 fail the material for an endurance of The activation energy U, should be taken as 150 kJ/mol and the molar gas constant as 8.314 J/mol K (15)

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