Formability Assessment of Prestrained Automotive Grade Steel Sheets Using Stress Based and Polar Effective Plastic Strain Forming Limit Diagram

Abstract

Accurate prediction of the formability in multistage forming process is very challenging due to the dynamic shift of limiting strain during the different stages depending on the tooling geometry and selection of the process parameters. Hence, in the present work, a mathematical framework is proposed for the estimation of stress based and polar effective plastic strainforming limit diagram (دƒand PEPSFLD) using the Barlat89 anisotropic plasticity theory in conjunction with three different hardening laws such as Hollomon, Swift, and modified Voce equation. Twostage stretch forming setup had been designed and fabricated to first prestrain in an inplane stretch forming setup, and, subsequently, limiting dome height (LDH) testing was carried out on the prestrained blanks in the second stage to evaluate the formability. The finite element (FE) analysis of these twostage forming process was carried out in lsdyna for automotive grade dualphase (DP) and interstitialfree (IF) steels, and the دƒFLD and PEPSFLD were used as damage model to predict failure. The predicted forming behaviors, such as LDH, thinning development, and the load progression, were validated with the experimental results. It was found that the LDH in the second stage decreased with increase in the prestrain amount, and both the دƒFLD and PEPSFLD could be able to predict the formability considering the deformation histories in the present multistage forming process with complex strain path.