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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.

现场辅助烧结技术(FAST)是一种在烧结过程中进行粉末压制的现代制造工艺。快速加热和冷却可缩短生产周期并改善材料性能。由于石墨工具和粉末材料在电势作用下产生的高温，对内部过程的实验测量是很难实现的。因此，数值方法是足够的，但必须以基于实验的模型为基础，并在考虑到测量中的不确定性的情况下，考虑到它们的可预测性而进行验证。在本项目中，将收集试验机中的整个过程，并使用工具和粉末工作件的本构模型进行建模。特别是，必须考虑电、热和机械的耦合特性。本构模型被实现为高阶时空有限元程序，其中还必须求解耦合的三场问题。因此，应用于电-热-机械耦合的分割方法将被开发用于有效和稳健地计算耦合问题的新概念，以便甚至可以考虑有反射的辐射。对于高阶有限元，需要进行有效的空间积分。采用自适应/分层有限元方法可以得到运动区域电热子问题的高精度结果，这意味着有限元方法在耦合问题方面的进一步发展。这些高度复杂和具有挑战性的问题只有在来自材料科学、力学和数值等不同学科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。