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.

轻量化结构对于汽车制造商来说是一种众所周知的策略，以减少汽车的重量、燃料消耗和总体温室气体排放，为了实现这些目标，铝合金以及更高强度和高强度钢材的使用越来越多。尽管镁的密度较低，但它一直难以被接受，这主要是由于对其不寻常的塑料行为缺乏了解，并且商业有限元程序中缺乏足够的材料模型。实施并进一步开发有效的材料模型为了克服这一缺陷，Li 等人 (2010) 的本构材料模型将使用原始模型的 UMAT 子程序来实现。形式将被先进的各向异性屈服准则所取代，以解决材料的明显各向异性问题。仅部分描述的模型的实施及其进一步发展代表着一项具有挑战性的任务。本构模型将受到采用先进的各向异性屈服准则的影响，并且可能会进行重大修改，由于新流动表面的复杂性，预计积分算法将发生变化。（2010）其研究仅在室温下进行，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。