A creep test is done on a cylindrical part with an initial diameter of 100mm and length of 500mm. a) At the stress of 50 MPa and a temperature of 675 degrees celsius, the steady-state creep rate is 3.2E-4 % per hour. Find the primary creep elongation and the steady-state creep elongation after 2200 hours, given that the creep deformation at that time is 5.6 mm. b) when the temperature is increased to 875 degrees celsius, the steady-state creep rate increases to 4.6E-4 % per hour. Assming the activation energy stays the same in this temperature range, calculate the activation energy in kJ/mol.

A creep test is done on a cylindrical part with an initial diameter of 100mm and length of 500mm. a) At the stress of 50 MPa and a temperature of 675 degrees celsius, the steady-state creep rate is 3.2E-4 % per hour. Find the primary creep elongation and the steady-state creep elongation after 2200 hours, given that the creep deformation at that time is 5.6 mm. b) when the temperature is increased to 875 degrees celsius, the steady-state creep rate increases to 4.6E-4 % per hour. Assming the activation energy stays the same in this temperature range, calculate the activation energy in kJ/mol.

Materials Science And Engineering Properties

1st Edition

ISBN:9781111988609

Author:Charles Gilmore

Publisher:Charles Gilmore

Chapter9: Time, Temperature, And Mechanical Properties

Section: Chapter Questions

Problem 9.6P

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