Tensile property evaluation by stress/strain analyses of small punch test specimen using finite element method

Nakata, Toshiya; Komazaki, Shinichi*; Kono, Yutaka*; Tanigawa, Hiroyasu

The small punch (SP) test method has many. However, because of the complex deformation process, it is difficult to evaluate the stress and strain distributions in the SP test specimen. The ability to evaluate material's tensile properties using the SP test would be of great engineering significance. In this research, in order to establish a new procedure for evaluating tensile properties by the SP test, we attempted the stress and strain analyses of the SP test specimen using the finite element method. As the result, the relationship between the maximum von-Mises equivalent stress in the SP specimen and the strain calculated based on the Ramberg-Osgood's law was in good agreement with the true stress-true strain curve obtained from the actual tensile test within uniform elongation. These results indicate that the tensile properties such as yield strength, tensile strength and uniform elongation can be estimated by the SP test and the subsequent finite element analysis.