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

FASS - 循环载荷下金属薄膜系统和细晶表面机械行为的基于物理的建模和仿真

• 批准号: 246651606
• 负责人: Professor Dr. Stefan Sandfeld
• 金额: --
• 依托单位: Laboratoire dEtude des Microstructures - UMR 104
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/246651606?language=en
• 关键词: FASS; Physically; based; modelling; simulation

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.

在这个项目中，我们的目标是基于物理的建模和模拟多晶金属薄膜系统和微柱循环载荷下的机械行为。首次在疲劳研究中，我们将使用一个全面的多尺度建模框架，其中包括分子动力学，离散和连续位错动力学。通过这些方法，我们研究了表面和界面（晶界）与疲劳诱导的位错图案和裂纹的相互作用，以了解在散装系统以及在微尺度组件的疲劳失效的早期阶段。将研究重点放在小样本上，这些样本可以完全模拟微观结构过程，该项目的最终目标是通过建立一个预测性的多尺度建模框架，为抗疲劳微观结构的计算设计提供物理基础，疲劳破坏的阶段。这将有利于广泛的技术应用，包括通过表面处理和微尺度部件的疲劳来增强抗疲劳性。

项目成果

Continuum representation of systems of dislocation lines: A general method for deriving closed-form evolution equations

• DOI: 10.1016/j.jmps.2016.05.009
• 发表时间: 2015-09
• 期刊: Journal of The Mechanics and Physics of Solids
• 影响因子: 5.3
• 作者: Mehran Monavari;S. Sandfeld;M. Zaiser

Pattern formation in a minimal model of continuum dislocation plasticity

• DOI: 10.1088/0965-0393/23/6/065005
• 发表时间: 2015-01
• 期刊: Modelling and Simulation in Materials Science and Engineering
• 影响因子: 1.8
• 作者: S. Sandfeld;M. Zaiser

Orientation-dependent Pattern Formation in a 1.5D Continuum Model of Curved Dislocations

弯曲位错的 1 5D 连续体模型中依赖于方向的图案形成

• DOI: 10.1557/opl.2015.200
• 发表时间: 2015
• 期刊: MRS Proceedings
• 作者: S. Sandfeld;V. Verbeke;B. Devincre
• 通讯作者: B. Devincre

D2C — Converting and Compressing Discrete Dislocation Microstructure Data

D2C â 转换和压缩离散位错微结构数据

• DOI: 10.1007/978-3-319-48254-5_64
• 发表时间: 2016
• 作者: D. Steinberger;M. Leimberger;S. Sandfeld
• 通讯作者: S. Sandfeld

A Universal Approach Towards Computational Characterization of Dislocation Microstructure

位错微结构计算表征的通用方法

• DOI: 10.1007/s11837-016-1967-1
• 发表时间: 2016
• 期刊: JOM
• 影响因子: 2.6
• 作者: D. Steinberger;R. Gatti;S. Sandfeld
• 通讯作者: S. Sandfeld