Experimental determination of yield loci for magnesium alloy AZ31 under biaxial tensile stress conditions at elevated temperatures
Experimental determination of yield loci for magnesium alloy AZ31 under biaxial tensile stress conditions at elevated temperatures
复制标题
高温双轴拉伸应力条件下镁合金AZ31屈服轨迹的实验测定
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
M. Grüner
中科院分区：
文献类型：
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作者：
M. Geiger;M. Merklein;W. Hußnätter;M. Grüner
有限元分析（FEA）已成为板料成形领域中最相关和最重要的工具之一，用于工艺设计和零件尺寸标注。然而，数值结果的可靠性和质量强烈地依赖于整个有限元模型，特别是对材料行为的建模，这对钣金零件的计算应力和应变产生了广泛的影响。因此，关于各向异性和温度效应的特征材料数据的实验测定是必不可少的。本文研究了温度对镁合金板材AZ31在不同的单轴和双轴应力状态下的屈服和硬化行为的影响。为此，制造技术主席（LFT）开发了一种实验装置，可以对金属板进行双轴拉伸试验。AZ31的屈服轨迹被确定为温度的函数，并且它们仅基于成形过程本身的测量数据。
The finite element analysis (FEA) has become one of the most relevant and most important tools in fields of sheet metal forming for designing processes and dimensioning parts. However, reliability and quality of the numerical results strongly depend on the whole FE-model and especially on the modeling of the material behavior, which shows wide impact on calculated stresses and strains of sheet metal parts. Therefore, the experimental determination of characteristic material data concerning anisotropic and temperature-effects is essential. In this paper the influence of temperature on the yielding and the hardening behavior of the magnesium sheet metal alloy AZ31 are investigated for different uniaxial and biaxial stress conditions. For that purpose an experimental setup has been developed at the Chair of Manufacturing Technology (LFT) which enables biaxial tensile testing of sheet metal. Yield loci of AZ31 are determined as a function of temperature and they are based on solely measurement data of the forming process itself.