Crash stable adhesives in application and simulation

Structural adhesives have been introduced to increase the stiffness and crashworthiness, as well as to improve corrosion protection and sealing of the body-in-white in upper class car models and are now entering the segment of compact cars. Various numerical approaches are used to predict the mechanical responses for the different loading conditions applied to develop and optimize the ‘bonded’ car-body. Most often these approaches are limited to describe the complex material behavior of adhesives, especially in crash and post-crash analysis. Thus, in the past, choosing the adhesive material and placing and optimizing the bondline was often based on testing and design experience. As one of the leading adhesive suppliers DOW Automotive is committed to support the OEMs and Tiers with suitable FEA approaches to improve the material selection process and reduce testing costs. In addition a reliable numerical prediction allows to design in the virtual development phase an optimized joint to get the most benefits out of the adhesive material. This will improve the usage of structural bonding also within the medium and lower car segments. This article will give an overview about current applications, development and validation of the modeling approach using MAT_Gurson (#120) within LS-DYNA for the crash stable adhesive BETAMATE 1496/1496V.

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