EPJ Web of Conferences 6, 16002 (2010)
https://doi.org/10.1051/epjconf/20100616002

DIC-aided biaxial fatigue tests of a 304L steel

¹ CEA Saclay, DEN, SRMA, 91191 Gif-sur-Yvette cedex, France
² LMT Cachan, 61 av. du Président Wilson, 94230 Cachan, France
³ EDF R&D / MMC, Avenue des renardières – Ecuelles, 77818 Moret Sur Loing, France
⁴ AREVA NP SAS, Tour AREVA, 92084 Paris La Défense, France

^a e-mail : martin.poncelet@cea.fr

Abstract

Several biaxial fatigue tests are conducted up to 10⁶ cycles at room temperature in the context of a collaboration LMT-Cachan / EDF / AREVA / SNECMA / CEA. Malteses cross specimens of 304L steel, designed to initiate crack in the bulk, are loaded by a triaxial testing machine. A Digital Image Correlation technique is used to measure strain during loading and detect crack initiation early. A special optical assembly and a stroboscopic sampling method are set up in this purpose. Several types of loadings are performed: equibiaxial with a loading ratio R = 0.1, equibiaxial with loading ratio R = –1, pseudo uniaxial (cyclic loading at R= 0.1 in one direction and constant loading in the other). First results are commented.