Fracture mechanics of ternary polymer blends: multiscale modeling accounting for processing induced morphologies

聚碳酸酯（PC）和丙烯腈-丁二烯-苯乙烯（ABS）的混合物（共混物）是广泛应用于技术应用的一类热塑性聚合物。它们具有复杂的微观结构，结合微观损伤机制强烈影响宏观断裂行为。虽然在文献中存在大量的实验研究，PC/ABS共混物的微观结构和断裂行为之间的相互关系是在本项目中的第一次系统地分析从多尺度连续力学模型和数值模拟。在第一阶段，已经可以从理想化模型（例如周期性微观结构）和加载条件（准静态，等温）中获得宝贵的经验。基于这些发现，第二阶段将集中在更现实的（如随机，形态）的微观结构，以及在断裂过程区的高加载速率和绝热加热的影响表示。因此，总体目标是更深入地了解PC/ABS共混物的微观结构-性能-关系，并开发用于宏观长度尺度的可靠本构模型。

Mixtures (blends) of polycarbonate (PC) and acrylonitrile-butadiene-styrene (ABS) are a class of thermoplastic polymers widespread in technical applications. They feature a complex microstructure which in conjunction with microscale damage mechanisms strongly affects the macroscopic fracture behavior. While numerous experimental studies exist in the literature, the interrelation between microstructure and fracture behavior of PC/ABS blends is in the present project for the first time analyzed systematically from multiscale continuum mechanical models and numerical simulations. In the first period, valuable experience could already be gained from idealized models (e.g. periodic microstructures) and loading conditions (quasistatic, isothermal). Based on these findings, the second period will focus on more realistic (e.g. random, morphology) representations of the microstructure as well as the effects of high loading rates and adiabatic heating in the fracture process zone. Overall targets thereby are a deeper insight into the microstructure-property-relationships of PC/ABS blends and the development of reliable constitutive models to be used on the macroscopic length scale.