Application of small punch creep test data for conventional creep

The focus of this work is to investigate the relationship between small punch (SP) creep test and conventional creep test using experimental data and finite element modeling (FEM). P92 steel was used for the experiments. Results of SP creep test under a constant force were compared with the conventional creep test data at temperatures of 600 degrees C. Time to fracture and the displacement measured during the SP creep tests are related in a similar manner to the corresponding conventional creep tests. Matching experimental data with FEM results yields a simple relationship between the applied force in the SP creep and the equivalent stress in the conventional creep. Likewise, it also establishes the relationship between the displacement and the strain. Consequently, one can derive equivalent creep constant and stress exponent of uniaxial creep from the SP creep data with the aid of FEM analysis.