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

目前，开发鲁棒的建模和计算方法来描述由多层混合材料制成的结构部件在碰撞载荷条件下的变形和失效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，这种困难主要归因于聚合物芯和金属覆盖层的时间依赖性机械行为以及在这种高动态载荷条件下金属/聚合物界面的意外行为。此外，用于材料模型的相关属性显着影响的制造工艺conditions.The当前项目的目的是开发可重构MPM层状复合材料的碰撞行为的预测建模方法。在这方面，将开发旨在调整量身定制的能量吸收特性的可靠方法。一方面，目标是增加结构能量吸收，另一方面，变形行为将通过局部失效机制进行选择性调整。为此目的，方法和设计准则的建立，使足够的和局部可变的MPM层状复合材料的性能与适应的工艺程序相结合的碰撞加载的结构部件的有效调整。此外，考虑到处理历史的多尺度建模和表征策略将被应用。在这方面，在不同的加载速率和条件下的实验研究，预计建立材料模型。

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.