Influence of fillers on the mechanical properties and failure behavior of filled polymer materials

本研究的目的是表征不同颗粒对不同加载条件下填充塑料破坏机制的影响。颗粒在复合材料中的大小、形状、取向以及颗粒与基体的界面是影响复合材料力学性能和破坏行为的重要因素。这将被调查采用载荷类型的张力，弯曲和剪切。破坏机制将分别在微观和中尺度上进行研究。重要的影响因素是夹杂处以界面（粘结）和基体（内聚）裂纹形式形成的裂纹及其在聚合物基体和夹杂中的扩展。最后，在中尺度上的破坏机制的结果将允许在宏观尺度上对组件的破坏机制进行评估。在这种情况下，断裂力学和经典强度两个方面都被考虑。除了强大的应用重点外，还需要在固体力学方面进行基础研究，特别是关于黏聚区的j积分以及混合模式加载条件下界面处裂缝形成和挠度的构形力及其解释。

The aim of the proposed research project is to characterize the influence of different particles on the failure mechanisms of filled plastics under different loading conditions. Regarding the particles, their size, shape and orientation in the composite material as well as the interface between particles and matrix are important factors, influencing the mechanical properties and failure behavior of these composite materials. This will be investigated employing the load types tension, bending and shear. The failure mechanisms will be investigated on the micro- and mesoscale, respectively. Important factors are the formation of cracks at the inclusions, both in the form of interfacial (adhesive) and matrix (cohesive) cracks and their propagation, both in the polymer matrix and in the inclusions. Finally, the results of the failure mechanisms on the mesoscale will allow the assessment of the failure mechanisms of components on the macroscale. In this context, both fracture mechanical and classical strength aspects are considered. In addition to a strong application focus, fundamental research in solid mechanics is required, in particular concerning the J-integral of cohesive zones as well as configurational forces and their interpretations with regard to crack formation and deflection at interfaces under mixed-mode loading conditions.