Evaluation of the physical mechanisms of adhesively bonded metal-based hybrid material systems under tensile loading

Publication date: 15 October 2017
Source:Materials & Design, Volume 132
Author(s): D. Hummelberger, L. Kärger, K.A. Weidenmann, J. Staeves, F. Henning
Hybrid material systems result from the specific combination of different materials. For optimized design of hybrid materials for lightweight structures, a profound knowledge regarding the interaction of its constituents is essential. This paper systematically analyzes and assesses adhesively bonded hybrid material systems consisting of different sheet metals in terms of their underlying physical mechanisms under uniaxial tensile loading. Hybrid solutions constructed of Interstitial-Free steel and twinning-induced plasticity steel as well as combinations of Interstitial-Free steel with an aluminum alloy are investigated in the course of this work. It is shown that the hybridization-induced mechanisms, bridging effect, multiple neck formation and localization hindrance, contribute to changes in the strain paths of the individual layers of the hybrid material system. These changes of the strain behavior enable stabilization of plastic instabilities of specific layers and, based on that, an up to 25% improvement in uniform elongation of these layers in comparison to the monolithic material. By consistent implementation of a design strategy based on the presented mechanisms for the stabilization of plastic instability, material combinations with improved ductility and tensile strength can be obtained.

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