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046 A Novel Geometry for Shear Test Using Axial Tensile Setup
* 1 , 1 , 2 , 3 , 4 , 5
1  ArGEnCo Department, University of Liège, Liège, 4000, Belgium
2  Laboratory for Materials and Structures, University of Liège, 4000, Belgium
3  Groupe de Physique des Matériaux, Normandie Univ, UNIROUEN, INSA Rouen, CNRS, Groupe de Physique des Matériaux, 76800 Saint-Etienne du Rouvray, France
4  Laboratoire de Cristallographie et Science des Matériaux, UNICAEN, Caen, 14050, France.
5  ArGEnCo Department, University of Liège, Liège, 4000, Belgium Research Director of the Fonds de la Recherche Scientifique - FNRS, Belgium


Abstract: This paper studies a novel geometry for the in-plane shear test performed with an axial electromechanical testing machine. In order to investigate the influence of the triaxiality rate on the mechanical behavior, different tests will be performed on the studied material: simple tensile tests, large tensile tests and shear tests. For the whole campaign, a common equipment should be employed to minimize the impact of the testing device. As a consequence, for the shear tests, the geometry of the specimen must be carefully designed in order to adapt the force value and make it comparable to the one obtained for the tensile tests. Like most of the existing shear-included tensile test specimens, the axial loading is converted to shear loading at a particular region through the effect of geometry. A symmetric shape is generally preferred, since it can restrict the in-plane rotation of the shear section, keep shear increasing in a more monotonic path and double the force level thanks to the two shear zones. Due to the specific experimental conditions, such as dimensions of the furnace and the clamping system, the position of the extensometer or the restriction of sheet thickness (related to the further studies of size effect at mesoscale and hot temperature), several geometries were brought up and evaluated in an iterative procedure via finite element simulations. Both the numerical and experimental results reveal that the final geometry ensures some advantages. For instance, a relatively low triaxiality in the shear zone, limited in-plane rotation and no necking are observed. Moreover, it also prevents any out-of-plane displacement of the specimen which seems to be highly sensitive to the geometry, and presents a very limited influence of the material and the thickness.

Keywords: In-plane shear; Thin specimen; Finite element simulation