Designed metal-polymer-metal sandwich structures for improved energy absorption characteristics of crash structures

目前，开发健壮的建模和计算方法来描述多层混合材料结构部件在碰撞载荷条件下的变形和破坏行为仍然是一个重大挑战。在金属-聚合物-金属（MPM）层状复合材料的情况下，这一困难主要归因于聚合物芯和金属覆盖层的时间依赖性力学行为，以及金属/聚合物界面在这种高动态加载条件下的意外行为。此外，用于材料模型的相关性能受制造工艺条件的显著影响。目前的项目旨在开发预测建模方法的可变配置的MPM层状复合材料的碰撞行为。在这方面，将发展旨在调整适合的能量吸收特性的可靠方法。一方面有针对性地增加结构的吸能，另一方面通过局部破坏机制有选择地调整结构的变形行为。为此目的，将建立方法和设计指南，使之能够有效地调整适当的和局部可变的MPM层状复合材料性能，并结合适应的碰撞加载结构部件的工艺程序。此外，考虑到加工历史的多尺度建模和表征策略将被应用。因此，将在不同加载速率和条件下进行试验研究，以建立材料模型。

Currently, developing robust modelling and calculation methods describing the deformation and failure behaviour of structural components made of multi-layered hybrid materials subjected to crash loading conditions is still a major challenge. In the case of metal-polymer-metal (MPM) layered composites, this difficulty is primarily attributed to the time-dependent mechanical behaviour of the polymeric core and the metallic cover layers as well as the unexpected behaviour of the metal/polymer interface under such highly dynamic loading conditions. In addition, the relevant properties used for the material model are significantly affected by the manufacturing process conditions.The current project aims at developing predictive modelling approaches of the crash behaviour of variably configurable MPM layered composites. In this regard, reliable methodologies aiming at the adjustment of tailored energy absorption characteristics will be developed. On the one hand, an increase of the structural energy absorption is targeted, and on the other hand the deformation behaviour will be selectively adjusted by means of local failure mechanisms. For this purpose, methods and design guidelines are to be established enabling an efficient adjustment of adequate and locally-variable MPM layered composites properties in combination with adapted process routines for crash-loaded structural components. Moreover, multi-scale modelling and characterisation strategies considering the processing history will be applied. In this regard, experimental investigations under different loading rates and conditions are foreseen to establish the material model.