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首页> 外文期刊>International Journal of Material Forming: Official Journal of the European Scientific Association for Material Forming - ESAFORM >Spring back evaluation for high and ultra high strength sheet steels with the bending under tension machine
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Spring back evaluation for high and ultra high strength sheet steels with the bending under tension machine

机译：拉伸机弯曲对高，超高强度钢板的回弹评估

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摘要

The Bending Under Tension (BUT) machine is used for evaluation of spring back in sheet metal forming. A strip is drawn over a rotating cylindrical die with different restraining forces. The strip is allowed to spring back after drawing and the curvature of the strip is measured. The loading sequence is typical to wall sections of pressed components, side wall curl, where the material has been bent, unbent and finally unloaded. The test was performed on four high and ultra high strength steels with tensile strengths in the range from 800 MPa to 1300 MPa. A clear separation of the data for the four steels was demonstrated. It was analysed to what extent the differences in spring back between the different steels was related to the differences in tensile strengths. A finite element simulation model was used to simulate the strip curvature after BUT testing. The material parameters of the model were fitted to monotonic uniaxial and equibiaxial tests and uniaxial cyclic tests. The model could describe the experimental data in a satisfactory way.
机译：张力下弯曲（BUT）机用于评估钣金成形中的回弹。在具有不同约束力的旋转圆柱模具上拉出一条钢带。拉带在拉拔后会弹回，并测量拉带的曲率。加载顺序通常适用于受压组件的壁部分，侧壁卷曲，在该处材料已弯曲，未弯曲并最终未加载。该测试是在抗张强度范围为800 MPa至1300 MPa的四种高强度和超高强度钢上进行的。证明了四种钢的数据清楚分离。分析了不同钢种之间的回弹差异在多大程度上与抗张强度的差异有关。 BUT测试后，使用有限元模拟模型来模拟带材的曲率。模型的材料参数适合于单调单轴和等双轴测试以及单轴循环测试。该模型可以令人满意的方式描述实验数据。

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