Analyse de sensibilité d'un modèle d'usure de poinçon lors du découpage d'alliages cuivreux

Les travaux présentés portent sur l'usure des poinçons lors du découpage d'alliages cuivreux. Une étude expérimentale a été conduite afin de caractériser le coefficient d'usure de trois nuances ainsi que leur comportement en traction. En parallèle, un modèle de prédiction d'usure basé sur la loi d'Archard a été développé sous Matlab®. A partir de post-traitements issus de simulations par éléments finis du découpage sous Abaqus®, l'usure du poinçon est alors évaluée par le modèle développé. La sensibilité de cet outil a été testée en faisant varier les principaux paramètres du procédé

Prediction of abrasive punch wear in copper alloy thin sheet blanking

International audienceThis work presents a combination of finite element simulations of copper alloy thin sheet blanking and a wear algorithm based on Archard formulation for abrasive wear of the punch. Firstly, a tribometer has been specifically designed to measure wear coefficient, and punch worn profiles have been extracted by means of a double-print method. Secondly, the blanking process has been simulated through the finite element method by using an elasto-plastic constitutive model and the shear failure model. Thirdly, a wear algorithm has been programmed using experimental wear data and mechanical fields computed from blanking simulation. Then, a damage criterion, namely the shear failure model, has been calibrated by an original method based on stress triaxiality analysis and shear height value measured from blanked edge profile. Finally, punch wear predictions have been discussed and compared to experimental results

Numerical and experimental analyses of punch wear in the blanking of copper alloy thin sheet

International audienceThis research on punch wear resulting from the blanking of copper alloy thin sheet has been conducted by means of experimental and numerical analyses. Firstly, the experimental method has consisted in measuring punch worn profiles from replicas, and secondly in obtaining the wear coefficient by using a specific tribometer. The numerical modelling of blanking process has been developed with the finite element method to compute the mechanical fields necessary to calculate wear. Thus, the Archard formulation for abrasive wear has been programmed to compute the wear depth and the resulting punch geometry. Finally the simulation results of wear prediction have been compared to experimental ones