FASS - Physically based modelling and simulation of the mechanical behaviour of metallic thin film systems and fine grained surfaces under cyclic loading

点击翻译按钮获取中文摘要

In this project we aim at physically based modelling and simulation of the mechanical behaviour of polycrystalline metallic thin film systems and micropillars under cyclic loads. For the first time in a fatigue study we will use a comprehensive multiscale modelling framework which comprises molecular dynamics, discrete and continuum dislocation dynamics. With these methods we investigate the interplay of surfaces and interfaces (grain boundaries) with fatigue-induced dislocation patterns and cracks, in order to understand early stages of fatigue failure in bulk systems as well as in microscale components. Focusing the investigation on small samples, which are amenable to full simulation of microstructural processes, allows us to directly validate the modelling effort by comparing our simulations with specifically tailored experiments which are an important part of the project.The ultimate goal of the project is to provide physical foundations for computational design of fatigue resistant microstructures by establishing a predictive multiscale modelling framework for the early stages of fatigue failure. This will be of benefit for a vast range of technological applications including the enhancement of fatigue resistance by surface treatment and fatigue of microscale components.