MatYLD is software that enables easy identification of advanced yield function parameters from experimental data in press forming simulations of advanced materials, including high-strength aluminum sheets. Conventional yield functions such as Hill’48 cannot adequately represent wrinkling that occurs during the forming process, which has led to significant rework at the prototyping stage. By using MatYLD, advanced yield functions such as Yoshida and Yld2000-2d can be applied, allowing high-accuracy reproduction of forming defects that were previously difficult to capture. In particular, it provides practical benefits directly linked to engineering design, such as enhanced wrinkling representation and highly accurate springback simulation, enabling reliable simulations from the design stage and significantly contributing to defect reduction and fewer trial iterations.
MatYLD efficiently identifies anisotropic parameters for advanced yield functions, such as Yoshida, Yld2000-2d, and Gotoh, while minimizing the amount of required experimental data. Specifically, the parameters required for various yield functions can be estimated using only uniaxial tensile test data in three sheet directions (flow stress and yield stresses: σ0, σ45, σ90; r-values: r0, r45, r90) together with equi-biaxial tensile stress (σb). In addition, after parameter identification, graphs of yield surfaces, in-plane uniaxial stress distribution, and r-values can be generated automatically, making it easier to gain a visual understanding of material behavior. This enables researchers and design engineers to quickly understand material behavior and efficiently build reliable material models. In addition to improving simulation accuracy, it also helps reduce testing costs and development time.
