A Multi-Scale Approach for Predicting Wrinkling and its Experimental Validation

本研究项目旨在提供各种载荷条件下材料抗起皱性的实验数据，并为模拟板料成形过程中的起皱提供一个可靠和强大的工具，这将大大提高模拟结果的置信度，从而对产品和工艺开发极为有益。日益加剧的环境问题和全球竞争迫使汽车行业积极寻求更薄、更轻、更强的材料。随着金属薄板厚度的减小，起皱的趋势显著增加。因此，有必要有一个很好的理解起皱的开始和它的后屈曲行为的金属板材，使这些新材料的最终产品的开发时间可以最小化。实验将包括新开发的楔形测试，收缩翻边测试和不规则三维形状的成形。测试结果将用于验证一种新的模拟工具的可计算性，即具有无网格富集（FEMME）的有限元方法，该方法被认为能够有效地捕获局部变形，而无需重新网格划分。方法和相关的软件程序将公布在我们的网站上，方便公众查阅。

This research project aims to provide experimental data on material resistance to wrinkling under various loading conditions and to provide a reliable and robust tool for simulating wrinkling in sheet metal forming processes, which will dramatically increase the confidence level on simulation results and therefore, be extremely beneficial to product and process development. The increasing environmental concerns and global competition have pressured the auto industry to aggressively search for thinner, lighter and stronger materials. As the thickness of sheet metal decreases, the tendency towards wrinkling increases significantly. It is therefore essential to have a good understanding of the onset of wrinkling and its post-buckling behavior of sheet metal so that the development time of bringing these new materials to final goods can be minimized. The experiments will include a newly developed wedge test, a shrink flanging test and forming of an irregular three-dimensional shape. The test results will be used to verify the computability of a new simulation tool, finite element methods with meshfree-enrichment (FEMME), which is believed to be able to capture local deformation effectively without the need of remeshing. The methodology and associated software routines will be posted on our website for easy public access.