WEB Load Path Transmission in Joining ElementsTuesday (22.09.2020) 11:35 - 11:50 Z: Special Symposia II Part of:
The mechanical properties of joined structures are considerably determined by the chosen joining technology. Throughout the product development process suitable joining elements, their quantity and spatial distribution must be specified. These steps are nowadays dominated by an empirical and iterative approach. With the aim of providing a method that enables a faster and more profound decision-making in the spatial distribution of joining points during product development, a new method for the load path analysis of joining points is presented. For an exemplary car body, the load type in the joining elements, i.e pure tensile, shear and combined tensile-shear loads, is determined using finite element analysis (FEA). Based on the evaluated loads, the resulting load paths in selected joining points are analyzed using a 2D FE-model of a clinching point.
All available methods for load path analysis are dependent on the selected coordinate system or the existing stress state. Thus, a generally valid statement about the load transmission path is not possible at this time. Here, a novel method for the analysis of load paths is used, which is independent of the alignment of the analyzed geometry. The basic assumption of the new load path analysis method was confirmed by using a simple specimen with a square hole in different orientations. The results presented here show a possibility to display the load transmission path invariant, i.e. independent of the orientation of the component and the loading force in relation to the coordinate system used for evaluation, in a joined cross tension specimen. In further steps the method will be extended for 3D analysis and the investigation of more complex assemblies. The primary goal of this methodical approach is an even load distribution over the joining elements and the component. This will provide a basis for future design approaches aimed at reducing the number of joining elements in joined structures.