P 958 – Experimental and numerical investigation of crash performance of hybrid joints

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P 958 – Experimental and numerical investigation of crash performance of hybrid joints

In the implementation of innovative lightweight designs more and more mechanical joining technologies are used. As apposed to the thermal joining technology the mechanical joining technology offers the crucial advantage that it can be reliably realized also joints of dissimilar materials without reducing the positive material properties by thermal influence. In the background of increasing demands in terms of high car body stiffness and occupant protection at high crash rates has especially the joining technology bonding in combination with the mechanical joining methods (hybrid joining) is
given a key role. For the effective use of this hybrid joining methods in crash relevant areas are the necessary characteristics of joints to predict the structural behavior of these compounds under high loading rates are still missing.
As part of the research project the crash behavior of hybrid joints (bonding in combination with self-pierce-riveting) in steel-steel material combinations has been extensively characterized. Therefore the adhesive characteristics were determined in basic experiments using standardized specimens. In addition, the development of a testing concept for the determination of parameters of point-like mechanically joined compounds based on basic experiments was a part of the research project. The load and rate dependent determination of values for the characterization of the behavior of mechanically, bonded and hybrid joints at the level of technological tests were carried out using the LWF-KS-2-testing concept, lap-shear and peeling specimen. This implies in an appropriate data base for assessing the structural behavior of these joints.
Based on the determined characteristic values on the basic experiments suitable numerical models have been developed and optimized for practical application. The verification of the developed equivalent models based on the determined parameters of technological specimens showed good agreement as compared to the experimental results for bonding, self-pierce riveting and for the hybrid combination of these joining methods. The validation of the equivalent model was carried out by simulation of the T-joint tests for the investigated joining technologies with variation of load application and loading rate. Here, a good agreement with the experimental results has been achieved. It was shown that the developed equivalent model in this research project for modeling hybrid joints (bonding in combination with self-pierce-riveting) is suitable in vehicle crash simulations.

Published in:
2015

Authors:
Prof. Dr.-Ing. G. Meschut, Prof. Dr.-Ing. O. Hahn, Dr.-Ing. D. Hein, Dipl.-Ing. A. Nelson