Hybrid flat-clinching of renewable raw materials

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The aim of the project is the experimental and numerical investigation of flat-clinching of metal and renewable raw materials due to joining by plastic deformation. For the numerical investigations of joining hardwood and metal for the first time, it is necessary to improve an existing material model for softwood. Based on the numerical process simulation for joining metal and hardwood with flat-clinching an increased knowledge of the joining mechanisms is striven, which should finally lead to guidelines for a reproducible joining process. The calibration of the FEM models will be realized on the basis of the experimental results. Furthermore, the numerical modeling of flat-clinching fiberboard (MDF) is another essential aspect of the project. The isotropic structure of fiberboard is comparable with fiber-reinforced plastics. Due to that, the applicability of existing material models for fiber-reinforced plastics for modeling fiberboard will be checked. The adaptation of the properties of the matrix material (adhesion promoter for MDF) and the reinforcements (wood fiber for MDF) will be realized by tensile and compression tests.In order to make a further substantial contribution within the SPP, the use of the Element-Free Galerkin method (EFGM) will be tested as an alternative for the FE simulation of flat-clinching. The EFGM is especially beneficial for processes with high plastic strains like flat-clinching, due to the unnecessary remeshing. This leads to a reduction of computation time and an improvement the of the simulation accuracy. Due to the missing know-how for the simulation of flat-clinching with EFGM investigations for the conventional clinching will be realized within the project. The resulting increase in knowledge will be summarized in guidelines, which will be open to the members of the SPP 1640. Furthermore, the knowledge will be used for the simulation of flat-clinching within the project.