Development of a homogenisation approach to describe the mechanical behaviour of thermoplastic vulcanisates under consideration of the process-induced anisotropy

对具有明显橡胶类特性的塑料的需求不断增加。几十年来，这些材料包括经典的弹性体，最近又包括热塑性弹性体（TPE），它由热塑性和弹性体相组成。通过这种方式，弹性体的有用性能与热塑性塑料的加工性能相结合。热塑性硫化橡胶（TPV）在TPE中具有特殊的作用。在TPV中，弹性体相交联并精细分散在连续热塑性相中。通过注射成型的加工由于局部不同的取向和分散过程而导致与加工相关的相形态。这导致机械性能的高度显著的各向异性。在文献中，有研究处理的关系和建模之间的形态特性和机械性能。然而，目前还没有足够的方法来考虑方向相关的材料行为和材料成分之间的关系。因此，这个地区可以说是未开发的，计划中的研究项目从那里开始。初步研究表明，TPE在流动方向上的非线性材料行为，可以映射具有良好的精度，通过扩展现有的超弹性材料模型。不幸的是，这仅对各向同性材料有效。通过将建模方法转移到各向异性材料，不能充分描述材料的非线性行为。该项目的目的是开发一种均匀化方法，用于描述热塑性硫化橡胶的机械材料行为，通过考虑过程引起的各向异性，并借助代表性体积元（RVE）。

The demand for plastics with pronounced rubber-like properties is constantly increasing. For decades, these materials have included classic elastomers and, more recently, thermoplastic elastomers (TPE), which consist of a thermoplastic and elastomeric phase. In this way, the useful properties of elastomers are combined with the processing properties of thermoplastics.The group of thermoplastic vulcanisates (TPV) has a special role within the TPE. In TPV, the elastomer phase is cross-linked and finely dispersed in the continuous thermoplastic phase. Processing by injection moulding results in a processing-related phase morphology due to locally different orientation and dispersion processes. This leads to a highly pronounced anisotropy of the mechanical properties. In the literature, there are studies dealing with the relationship and modelling between morphological properties and mechanical behaviour. However, currently no adequate approaches available to consider the relationship between the direction-dependent material behaviour and the material composition. Therefore, this area can be called unexplored.The planned research project starts there. Preliminary investigations shows that the nonlinear material behaviour of TPE in flow direction can be mapped with good accuracy by extending existing hyperelastic material models. Unfortunately, this is only valid for an isotropic materials. By transferring the modelling approach to anisotropic materials, the nonlinear material behaviour is not adequately described. The aim of the project is to develop a homogenisation approach for describing the mechanical material behaviour of thermoplastic vulcanisates by taking into account the process-induced anisotropy with the aid of a representative volume element (RVE).