权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

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。为了达到这些目标，使用铝合金以及更高和高强度的钢已日益成为批量生产的标准。尽管镁的密度很低，但它一直难以被接受，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。目前研究项目的任务是实施和进一步开发一种高效的镁片材料模型，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。模型原始形式的von Mises屈服准则将被一个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。仅部分描述的模型的实现及其进一步的开发是一项具有挑战性的任务。事实上，采用先进的各向异性屈服准则将对整个本构模型产生影响，并可能进行重大修改。由于新流面的复杂性，积分算法可能会发生变化。Li等人（2010）的研究仅在室温下进行，作为补充，该模型将在提高温度下进行等温测试。在相关的成形技术温度范围内，将使用已经实施的以及新的实验方法进行验证。