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.

轻巧的结构是用于汽车制造的一种已知策略，以减少汽车的重量，燃油消耗和整体温室排放。为了满足这些目标，铝合金以及高强度和高强度钢的使用已成为串联生产的标准。尽管密度较低，但镁仍在努力接受，这主要是由于缺乏对其异常塑料行为的了解以及在商业FE程序中缺乏足够的材料模型。本研究项目的任务是实施并进一步开发镁片的有效材料模型，以克服这种防御。为此，Li等人的构型材料模型称为Twinlaw。（2010年）将使用UMAT子例程在Abaqus/Standard中实施。 von mises以其原始形式的模型产量标准将由先进的各向异性产量标准替代，以解决该材料的明显各向异性。实施唯一的部分描述的模型及其进一步的开发代表了一项挑战任务。实际上，整个本构模型将受到采用先进的各向异性收益标准的影响，并且很可能会在重大返工之下。除其他事项外，由于新流动表面的复杂性，集成算法将更改。 Li等人的补充。（2010年），其研究仅在室温下进行，该模型将在高温下进行等温测试。相关形成技术温度范围内的验证将使用已经实现的新实验方法进行。