Evaluation of common tests for fracture characterisation of advanced high-strength sheet steels with the help of the FEA
Evaluation of common tests for fracture characterisation of advanced high-strength sheet steels with the help of the FEA
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借助有限元分析 (FEA) 评估先进高强度钢板断裂表征的常见测试
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发表时间：
2016
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通讯作者：
B. Behrens
中科院分区：
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作者：
I. Peshekhodov;M. Dykiert;M. Vucetic;B. Behrens
本文介绍了利用有限元分析对先进高强钢板断裂特性常用试验的评价结果。试验包括3次面内剪切试验、2次单轴拉伸试验、2次平面应变拉伸试验和2次等双轴拉伸试验。采用了三种不同屈服位点、应变硬化率和三种不同厚度强度的高强度钢。基于裂纹起裂时刻试件等效塑性应变和损伤变量的空间分布以及裂纹起裂位置应力状态的时间变化进行评价。对于面内剪切、单轴拉伸和平面应变拉伸，不能无条件推荐任何一种试验方法，因为所研究的试验方法的缺点是不可忽视的。然而，在每一组中，可以选择一种测试，它代表了其优点和缺点之间可接受的折衷：IFUM蝴蝶试件的面内剪切剪切试验，孔试件的单轴拉伸试验和腰试件的平面应变拉伸试验。相反，可以无条件推荐对圆形试样进行冲头Ø 100 mm的等双轴拉伸胀形试验。在未来，优化研究试验的面内剪切，单轴拉伸和平面应变拉伸似乎是必要的。
The paper presents results of evaluation of common tests for fracture characterization of advanced high-strength sheet steels with the help of the FEA. The tests include three in-plane shear tests, two uniaxial tension tests, two plane strain tension tests and two equibiaxial tension tests. Three high-strength steels with different yield loci, strain hardening rates and strengths in three different thicknesses each were used. The evaluation was performed based on the spatial distribution of the equivalent plastic strain and damage variable in the specimen at the moment of crack initiation as well as on the time variation of the stress state at the crack initiation location. For in-plane shear, uniaxial tension and plane strain tension, no test can be unconditionally recommended as disadvantages of all studied tests in these groups cannot be neglected. However, in each of these groups, a test can be chosen, which represents an acceptable compromise between its advantages and disadvantages: the shear test on an IFUM butterfly specimen for in-plane shear, the tensile test on a holed specimen for uniaxial tension and the tensile test on a waisted specimen for plane strain tension. On the contrary, the bulge test on a circular specimen with a punch of Ø 100 mm can be unconditionally recommended for equibiaxial tension. In the future, optimisation of the studied tests for in-plane shear, uniaxial tension and plane strain tension appears to be necessary.