Electro-thermo-mechanical modeling of Field Assisted Sintering Technology using high-order finite elements validated by experiments

使用经过实验验证的高阶有限元对现场辅助烧结技术进行电热机械建模

基本信息

批准号：
165958631
负责人：
Professor Dr.-Ing. Alexander Düster
金额：
--
依托单位：
Institut für Technische Mechanik
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2010
资助国家：
德国
起止时间：
2009-12-31 至 2013-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/165958631?language=en
关键词：
Electro thermo mechanical modeling Field

项目摘要

Field assisted sintering technology (FAST) is a modern manufacturing process, where during the sintering process powder compaction is performed. Fast heating and cooling yield shorter production periods and improved material properties. Caused by the high temperatures, which are induced in the graphite tools and the powder material by an electrical potential, an experimental measurement of the internal processes are hardly realizable. Thus, numerical methods are adequate, which, however, must be based on both experimental-based models as well as validated in view of their predictability under consideration of uncertainties in the measurements. In this project the entire process in the testing machine will be gathered and modeled with constitutive models for both the tools and the powder workpiece. Particularly, the coupled electrical, thermal and mechanical properties must be considered. The constitutive models are implemented into a high order space and time finite element program, where, additionally, the coupled three-field problem must be solved. Accordingly, new concepts for an efficient and robust computation of coupled problems using a partitioned approach applied to electro-thermo-mechanical coupling will be developed so that even radiation with reflection can be considered. In the case of high order finite elements an efficient space integration is required. Highly accurate results of the electro-thermal subproblem of the moving regions will be achieved using adaptive/hierarchical finite cell approach, which implies the further development of the finite cell method in view of coupled problems. These highly complex and challenging issues are only possible within collaborating partners coming from different disciplines such as material science, mechanics and numerics leading to new contributions applicable even to further multi-physical issues.

现代辅助技术（FAST）是现代制造过程，在烧结过程中进行粉末压实。快速加热和冷却产生较短的生产期和改善的材料特性。由高温引起的石墨工具和电势诱导的粉末材料引起的，对内部过程的实验测量几乎是无法实现的。因此，数值方法是足够的，但是，这必须基于基于实验的模型，并且鉴于其在测量中考虑的不确定性正在考虑的可预测性。在此项目中，将收集测试机中的整个过程，并使用用于工具和粉末工件的组成型模型进行建模。特别是必须考虑耦合的电气，热和机械性能。本构模型被实现为高阶空间和时间有限元程序，此外，必须解决耦合的三场问题。因此，将开发出针对电动机械耦合的分区方法对耦合问题进行有效且强大计算的新概念，以便可以考虑使用反射的辐射。在高阶有限元素的情况下，需要有效的空间集成。使用自适应/分层有限细胞方法将实现移动区域电热子问题的高度准确的结果，这意味着有限细胞法的进一步发展鉴于耦合问题。这些高度复杂和具有挑战性的问题只有在来自不同学科的合作伙伴（例如材料科学，力学和数字）的合作伙伴中才有可能，从而导致新的贡献，甚至适用于进一步的多物理问题。