Multiscale modelling of joining processes under consideration of the thermo-mechano-chemical behaviour in the interface

考虑界面热机械化学行为的连接过程的多尺度建模

• 批准号: 264271912
• 负责人: Professorin Dr.-Ing. Stefanie Reese
• 金额: --
• 依托单位: Lehrstuhl und Institut für Angewandte Mechanik
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/264271912?language=en
• 关键词: Multiscale; modelling; joining; processes; under

Joining processes, such as the here considered processes of roll bonding and clinching, are characterized by a complex interplay of plastic deformation, thermomechanical cou-pling effects, adhesive and diffusive processes as well as interactions between the mi-crostructures involved in the process. The design of new or improved joining technologies requires a fundamental understanding of the mechanisms which is barely achievable by working solely experimentally. The present project deals therefore with a sound multiscale modelling of the essential effects characterizing joining. In particular, state-ments about the corrosion behaviour, the fatigue behaviour, and the bonding strength and properties of the joint are to be worked out. We distinguish between the modelling at the microscale, which allows the process-independent investigation of the physical and chemical processes taking place during joining, and the macromechanical modelling, which takes the structural characteristics of concrete processes into account. The focus is on the as accurate as possible but scale adequate resolution of the thermomechanical behaviour in the interface, which is to be achieved by a significant extension of the co-hesive zone technique. The macromechanical modelling is to be developed by means of a database that is generated on the basis of detailed parameter studies at the microscale and is complemented by experimental results obtained both within the current project as well as by partner projects. The influence of the micro- and macromechanical process parameters on the joining result is to be precisely captured at each modelling scale. A middle-term objective of the research project is to render the new simulation tool so powerful that it could enable the prediction of results of diverse joining processes, and allow the choice of a suitable joining process in terms of reliability and reproducibility without the need of additional experimental investigations.

连接过程的特点是塑性变形、热机械耦合效应、粘结和扩散过程以及过程中所涉及的微观组织之间的相互作用的复杂相互作用。设计新的或改进的连接技术需要对机构有基本的了解，这仅通过实验工作是很难实现的。因此，本项目涉及对连接的基本影响进行合理的多尺度模拟。特别是要制定关于接头的腐蚀性能、疲劳性能、结合强度和性能的规定。我们区分了微观尺度的建模和宏观力学建模，前者允许对连接过程中发生的物理和化学过程进行独立于过程的研究，后者考虑了具体过程的结构特征。重点放在尽可能精确但尺度足够的界面热机械行为分辨率上，这是通过显著扩展共粘区技术来实现的。宏观机械模型将通过一个数据库进行开发，该数据库是在微观参数详细研究的基础上生成的，并辅之以在当前项目内以及伙伴项目中获得的实验结果。在每个模型尺度上都要准确地捕捉到微观和宏观机械工艺参数对连接结果的影响。该研究项目的中期目标是使新的模拟工具变得非常强大，以便能够预测不同连接过程的结果，并允许在可靠性和重复性方面选择合适的连接过程，而不需要额外的实验调查。