Ermittlung von Fließkurven für Blechwerkstoffe im Mikrobereich mittels Aero-Bulgetest unter Berücksichtigung des Skalierungseffektes

使用空气膨胀试验确定微观范围内金属板材的流动曲线，并考虑结垢效应

• 批准号: 5375309
• 负责人: Professor Dr.-Ing. Hartmut Hoffmann
• 金额: --
• 依托单位: Lehrstuhl für Umformtechnik und Gießereiwesen
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2002
• 资助国家: 德国
• 起止时间: 2001-12-31 至 2008-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5375309?language=en
• 关键词: Ermittlung; von; Flie; kurven; Blechwerkstoffe

By the trend of manufacturing small and human oriented products, the needs of scaling down of the conventional sheet metal forming process is necessary. Furthermore thorough understanding of scaling effect on the mechanical properties and development of mini-press machine specially are needed, too. The purpose of this project is to unterstand the scale effect by doing miniaturized tensile test. A device for the miniaturized tensile test will be designed and inserted to the conventional tensile test machine in order to get little vibration and increase accuracy during the test. With variable sizes of specimens, tensile tests will be performed. By understanding the rule of scale-down effect using mechanical properties from miniaturized tensile tests, a software which can calculate suitable mechanical properties for the desired size with considering scaling effect will be developed. Finally, simulation and experiment of simple cup drawing process will be carried out varying the sizes of tools from few hundred mm to few mm. Comparing both results from simulation and experiment, the developed software will be verified.

随着产品小型化和人性化的发展趋势，传统板料成形工艺的小型化势在必行。此外，还需要深入了解缩比效应对材料力学性能的影响，特别是需要开发小型压力机。本计画的目的是借由小型化的拉伸实验来了解尺度效应。设计了一种小型化拉伸试验装置，并将其插入到传统的拉伸试验机中，以便在试验过程中获得较小的振动并提高精度。将使用不同尺寸的样本进行拉伸测试。通过了解尺度效应的规律，利用小型化拉伸试验的力学性能，将开发一个软件，可以计算出所需尺寸的合适的力学性能，考虑尺度效应。最后，对简单杯形件拉深过程进行了数值模拟和实验，并将模拟结果与实验结果进行了对比，验证了所开发的软件的有效性。