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Experiments and models until failure of bonded joints for crashworthiness

Abstract : Since many years, structural bonding is widely used in automotive industry. Using the new generation adhesives, the energy management capabilities of cars structures can be improved. In order to take into account these new features into automotive structures, optimal use of structural bonding is needed. This kind of optimization is only achievable with numerical simulations and especially finite elements analysis. In this context, these thesis works bring a modeling strategy of bonded structures for crashworthiness. This modeling strategy is based on two different finite element models. The first one is focused on a mesoscopic approach and the second one on a macroscopic one. These models require the development of a new material behaviour and failure model for the mesoscopic approach and a new finite element for the macroscopic one. The behaviour parameters of these approaches are identified on bulk adhesive specimens. The failure ones are identified on bulk adhesive for the mesoscopic approach and on assemblies for the macroscopic one. These tests are achieved on a wide range of strain rate (from 0.01 to 5000 s-1) using the digital image correlation technique. Finally, these approaches are validated on different structures and a modeling strategy of bonded structures for crashworthiness is then proposed.
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https://hal-uphf.archives-ouvertes.fr/tel-03009020
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Submitted on : Tuesday, November 17, 2020 - 9:46:36 AM
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  • HAL Id : tel-03009020, version 1

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David Morin. Experiments and models until failure of bonded joints for crashworthiness. Engineering Sciences [physics]. Université de Valenciennes et du Hainaut-Cambrésis, 2010. English. ⟨NNT : 2010VALE0026⟩. ⟨tel-03009020⟩

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