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° Celsius, the steady-state creep rate is 3.2x10-4 % 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° Celsius, the steady-state creep rate increases to 4.6x10-4 % per hour. Assuming 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° Celsius, the steady-state creep rate is 3.2x10-4 % 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° Celsius, the steady-state creep rate increases to 4.6x10-4 % per hour. Assuming the activation energy stays the same in this temperature range, calculate the activation energy in kJ/mol.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text: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° Celsius, the steady-state
creep rate is 3.2x10-4 % 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° Celsius, the steady-state creep rate
increases to 4.6x10-4 % per hour. Assuming the activation energy stays the same
in this temperature range, calculate the activation energy in kJ/mol.
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