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Contribution to an efficient FE-based design of magnesium sheet parts

有助于镁板零件基于有限元的高效设计

基本信息

批准号：
227979140
负责人：
Professorin Dr.-Ing. Marion Merklein
金额：
--
依托单位：
Lehrstuhl für Fertigungstechnologie (LFT)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2013
资助国家：
德国
起止时间：
2012-12-31 至 2016-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/227979140?language=en
关键词：
Contribution efficient FE based design

项目摘要

Light weight construction is for automotive manufactures a known strategy in order to reduce car´s weight, fuel consumption and overall greenhouse emissions. In order to meet these targets the use of aluminum alloy as well as higher- and high-strength steels has increasingly become a standard for series production. Magnesium has struggled for acceptance despite the low density, mainly due to the lack of knowledge of its unusual plastic behavior and the absence of adequate material models in commercial FE-programs. The mission of the present research project is to implement and further develop an efficient material model for magnesium sheets in order to overcome this deficit. For this purpose, the constitutive material model called TWINLAW from Li et al. (2010) will be implemented in ABAQUS/Standard using a UMAT subroutine. The von Mises yield criterion of the model in its original form will be substitute by an advanced anisotropic yield criterion to address the pronounced anisotropy of the material. The implementation of the only partially described model together with its further development represents a challenging task. In fact, the whole constitutive model will be impacted by the adoption of an advanced anisotropic yield criterion and will likely undergo a major rework. It is among other things expected that the integration algorithm will be changed because of the complexity of the new flow surface. Supplementary to Li et al. (2010) whose investigations were carried out at room temperature only, the model will be isothermally tested at enhanced temperatures. This validation in a relevant forming technology temperature range will be performed using already implemented as well as new experimental methods.

轻量化结构是汽车制造商的一项已知战略，以减少汽车的重量，燃料消耗和总体温室气体排放。为了满足这些目标，铝合金以及更高强度和高强度钢的使用日益成为批量生产的标准。尽管镁的密度很低，但镁一直在努力被接受，这主要是由于缺乏对其不寻常的塑性行为的了解，以及在商业FE程序中缺乏足够的材料模型。本研究项目的使命是实施并进一步开发一种有效的镁板材料模型，以克服这一缺陷。为此，Li等人（2010）的本构材料模型TWINLAW将使用UMAT子程序在ABAQUS/Standard中实现。在其原始形式的模型的冯米塞斯屈服准则将被替代的先进的各向异性屈服准则，以解决显着的各向异性的材料。实施仅部分描述的模型及其进一步发展是一项具有挑战性的任务。事实上，整个本构模型将受到采用先进的各向异性屈服准则的影响，并可能会经历一个重大的返工。由于新流面的复杂性，预计积分算法将发生变化。Li等人（2010年）仅在室温下进行了研究，作为对该研究的补充，该模型将在高温下进行等温测试。将使用已实施的以及新的实验方法在相关成形技术温度范围内进行验证。