Estudio de la evolución del espesor en ensayos de Small Punch Test

The Small Punch Test (SPT) is an increasingly expanding test used to obtain different mechanical data, such as strength, fracture, creep, etc…especially when there is little material available. However, the SPT test is more complicated than the uniaxial tensile test due to its non-linearity, which makes it difficult to relate the data obtained with the tensile tests. In fact, in the literature there is no clear model linking these tests and a different calibration should be used for each material. The complication of the SPT test is that the reduction of the sample thickness is not homogeneous in its gauge volume. In this work we proceeded to determine the variation of the SPT specimen thickness at several points, especially at the center and at the rupture zone, by means of the use of finite elements in COMSOL, taking a SLM AM (selective laser melting additive manufactured) 316L stainless steel as the base material for modelling. For the appropriate modelling in COMSOL, the mechanical parameters of two 316L extreme thermomechanical treatments have been implemented, one annealed to a minimum hardness and another heavily work-hardened. The sample thickness variation results allow advancing in the theoretical modeling of the SPT behavior in order to obtain more accurate correlations with tensile tests data.Este trabajo contó con el apoyo del Ministerio de Economía, Industria y Competitividad de España bajo el proyecto MAT2015-68919-C3-1-R (MINECO/FEDER). Marta Álvarez-Leal agradece al MINECO un contrato FPI BES-2013-063963, D. David Sánchez-Ávila agradece a la Universidad Nebrija por el apoyo de la Beca Predoctoral y su convenio de colaboración con CENIM, CSIC.Peer Reviewe