Design of a reverse deep drawing experiment enhancing strain path changes

Abstract

To evaluate a priori the amount of strain path changes in forming processes in order to adjust the complexity of constitutive equations, it is necessary to develop forming tests at the laboratory scale sensitive to strain paths changes. In this work, a micro-forming experiment is designed in order to perform reverse deep drawing tests on ultra-thin metallic sheets, typically 0.1mm-thick copper alloys. This experiment is supposed to be set on a Zwick-Roell BUP 200 device. The work presents the design of the device and the evolution of strain path changes occurring during both stages of the process. The experimental results obtained after both stages (force-displacement, thickness) are presented. Finally, a sensitivity analysis of a strain path change indicator is proposed through the numerical simulation of the reverse deep drawing test by varying the geometry of the tools.