Fracture Prediction for High-strength Steel Sheet Subjected to Draw-bending Using Forming Limit Stress Criterion
Fracture Prediction for High-strength Steel Sheet Subjected to Draw-bending Using Forming Limit Stress Criterion
复制标题
使用成形极限应力准则预测拉弯高强度钢板的断裂
DOI：
10.1088/1742-6596/734/3/032012
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
H.
中科院分区：
文献类型：
--
作者：
Sekiguchi;C.;Hakoyama;T.;Kuwabara;T. and Fukiharu;H.
使用成形极限应力准则的概念研究了拉伸弯曲金属板的断裂准则。试验材料为1.0mm厚的高强度钢板，抗拉强度为590MPa。当样品经过模具轮廓时，样品在张力下经历弯曲不弯曲。拉拔速度设定为5～100mm·s-1。试样断裂时的真实应力σ DB 的大小已被精确确定。此外，对试验材料进行多轴扩管试验，测量试验材料在平面应变拉伸下的成形极限应力σ PT 。发现σ DB 比σ PT 大2.8-6.3%。因此，可以得出结论，成形极限应力准则作为拉深弯曲中的断裂准则是有效的。
A fracture criterion for sheet metals subjected to draw-bending is investigated using the concept of the forming limit stress criterion. The test material used is a 1.0-mm-thick high-strength steel sheet with a tensile strength of 590MPa. The specimen undergoes bendingunbending under tension when passing over the die profile. The drawing speed was set to 5-100 mm• s-1. The magnitude of true stress σ DB when a specimen fractured has been precisely determined. Moreover, multiaxial tube expansion tests of the test material are performed to measure the forming limit stress σ PT of the test material under plane-strain tension. It is found that σ DB is larger than σ PT by 2.8-6.3%. Therefore, it is concluded that the forming limit stress criterion is effective as a fracture criterion in draw-bending.