Surrogate modelling of hybrid material pairings including organic sheetsTuesday (28.04.2020) 10:20 - 10:40 Room 1
Organic sheets bear a huge lightweight potential to replace conventional steel sheets due to their high specific material parameters, promising deep-drawing properties, as well as capability of energy absorption. To establish organic sheets in a material mix, adequate joining technologies are required which allow to produce reliable, load-bearing joints in a reproducible manner for a hybrid material pairing between steel sheets and organic sheets. With the help of a remote laser, hybrid material joints are manufactured with a thermomechanical formed form-closure and characterized using a modified set-up specimen. Based on the experimental results, surrogate models are developed to represent the deformation and failure behavior of the joints in a simulation complying with indus-trial discretization. Prerequisite for this development is a phenomenological material model for the organic sheet covering its elasto-plastic hardening as well as fracture initiation ranging from a brittle mode in fiber direction to a ductile one in off-axis orientations. A workflow using quantifiable criteria is introduced which allows the objective calibration of the model parameters for multiple load-cases taking the locally induced damage by the joining process into account. This workflow is demonstrated here for the hybrid material pairing of an organic sheet 102RG600 Tepex® dynalite and ENAW6082-T6 and S355J2H. The results presented in this paper are based on the joint research project “LaserLeichter”.