Numerical analysis on the elastic deformation of the tools in sheet metal forming processes

Effective FE models for simulating the elasto-mechanical characteristics of forming machines

“…Common forming simulations refer to a rigid behavior of the underlying tool geometries [1], particularly when the focus remains on the interaction among the tool's active components. Many forming simulation environments offer the usage of elastic deformations for the dies, since regarding Robert Tehel robert.tehel@iwu.fraunhofer.de 1 Fraunhofer IWU, Reichenhainer Straße 88, 09126 Chemnitz, Germany the tools, compliancy yields an increase in accuracy as exemplarily probed by Neto et al [7] or Pilthammar et al [11] for drawing processes and by Chen et al [4] for a stamping process. Furthermore, this step demands only little effort, since the exact geometry of the forming tool is available as CAD data.…”

Plastic anisotropy and failure in thin metal: Material characterization and fracture prediction with an advanced constitutive model and polar EPS (effective plastic strain) fracture diagram for AA 3014-H19

“…Barros et al (2013) reported the accurate prediction of the earing during cup drawing depends not only on the correct modeling of the materials mechanical behavior but also on the accuracy of the global process modeling including the blank holder, the yield criterion selected, the work hardening law and the strategy used to identify the materials parameters. Neto et al (2016) studied the influence of elastic deformation of the tooling during cup drawing and concluded the accuracy of the sheet metal forming simulation can be improved considering the elastic deformation of the forming tools in the numerical model. Yoon et al (2011) proposed an analytical approach with an arbitrary anisotropic yield function to determine the earing profile in the drawing and ironing processes.…”

Considering the stiffness of the forming tools in the numerical analysis of the ironing process

“…The Swift cup drawing test proposed under the benchmark EXACT [5] was adopted in the present study to assess the importance of the stiffness of the forming tools on the numerical predictions, in particular their accurate dimensions. Accordingly, the finite element model considers that the forming tools are modelled either as rigid or as deformable bodies [6]. Then, the numerical results are compared with the experimental ones, highlighting the impact of the tools deformation in the ironing stage.…”