Abstract
This Paper proposes the determination method of creep exponent and coefficient from indentation creep testing. Extensive finite element analyses were performed for simulating the indentation creep, and stress states under the indenter was analyzed. An equation was developed which relates the indentation creep strain rate to the indentation stress based on the theory of plasticity taking account of the stress multiaxiality under the indenter. The equation theoretically demonstrated that the creep exponent obtained from the indentation creep testing agrees with that in uniaxial tensile creep testing. The equation also proposed the determination method of the creep coefficient from the indentation creep testing. An experimental apparatus for performing the indentation creep testing was developed and the creep exponent and coefficient obtained in the indentation tests agreed with those in the uniaxial creep in the creep datasheet. The validity of the proposed method was also verified by an extensive creep finite analysis.
