Characterization and Thermo – Elasto – Viscoplastic Modelling of Cunip Copper Alloy in Blanking Process

Numerical simulations of blanking process are performed to investigate CuNiP copper alloy behavior under blanking conditions. Numerical simulations are mostly dependant of a correct modeling of the material behavior with thermo-mechanical sensitivity. A thermo-mechanical characterization by a set of uniaxial tensile tests at different temperatures and strain rates is presented. A thermo – elasto – viscoplastic approach was investigated to propose the mechanical behavior model based on a phenomenological way in the framework of the thermodynamic of irreversible processes. This model is implemented in finite element software untitled “Blankform” dedicated to the numerical simulation of precision blanking operations and developed at the Applied Mechanics Laboratory. Numerical results are presented and compared with experiments