|About this Abstract
||NUMISHEET 2021: The 12th International Conference on Numerical Simulation of 3D Sheet Metal Forming Processes
||Evaluation of the Influence of Through-thickness Gradients and Tool Contact Pressure on Formability in Stretch-bend Tests
||Nicholas Aydemir, Clifford Butcher
|On-Site Speaker (Planned)
Practical sheet metal forming operations typically involve significant out-of-plane deformation and contact with tooling that affects formability yet forming limit curves used to predict localization are based upon in-plane stretching and do not take tooling contact pressure into account. Out-of-plane deformation due to bending creates through-thickness stress and strain gradients that can suppress the onset of necking, and tool contact pressure generates compressive stresses that create a three-dimensional stress state at the interface. The influence of through-thickness stress and strain gradients and the influence of contact pressure is numerically investigated using finite-element simulations of the angular stretch bend test. The influence of element formulation and bend severity are considered. The accuracy of correlations in the literature to estimate the through-thickness stress and strain distributions and contact pressure to correct the limit strains in Nakazima and stretch-bending tests are then evaluated.
||Definite: At-meeting proceedings