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

对具有明显橡胶样性能的塑料的需求在不断增加。几十年来，这些材料包括经典弹性体和最近的热塑性弹性体（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。热塑性硫化胶（TPV）在TPE中起着特殊的作用。在TPV中，弹性体相交联并精细分散在连续的热塑性相中。由于局部取向和分散过程的不同，注塑加工导致了与加工相关的相形态。这导致了机械性能的高度各向异性。在文献中，有研究处理形态属性和力学行为之间的关系和建模。然而，目前还没有足够的方法来考虑方向依赖材料行为与材料成分之间的关系。因此，这个地区可以被称为未开发地区。计划中的研究项目从那里开始。初步研究表明，通过扩展现有的超弹性材料模型，可以较准确地映射TPE在流动方向上的非线性材料行为。不幸的是，这只适用于各向同性材料。通过将建模方法转移到各向异性材料，材料的非线性行为没有得到充分的描述。该项目的目的是开发一种均质化方法，通过考虑到具有代表性体积元（RVE）的过程诱导的各向异性，来描述热塑性硫化胶的机械材料行为。

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).