A Cruciform Shape to Study the Influence of Strain Paths on Forming Limit Curves
A Cruciform Shape to Study the Influence of Strain Paths on Forming Limit Curves
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十字形形状研究应变路径对成形极限曲线的影响
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
E. Ragneau
中科院分区：
文献类型：
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作者：
L. Leotoing;D. Guines;Shunyi Zhang;E. Ragneau
金属板成形工艺的优化需要准确预测材料行为和成形能力，特别是对于与典型的低碳钢相比通常表现出低成形性的铝合金。本研究提出了一种基于使用十字形形状的原始技术，用于成形极限曲线（FLC）的实验表征和数值预测。通过使用十字形形状，整个成形极限图被独特的几何形状所覆盖，这要归功于对试样两个主要方向上的位移的控制。测试是无摩擦的，线性和非线性应变路径的影响可以很容易地研究，因为应变路径是由施加的位移控制，独立于试样的几何形状。应变路径的影响首先研究通过引入线性预应变（单轴，平面应变或等双轴），在轧制方向。然后对非线性预应变路径进行了试验.
The optimization of sheet metal forming processes requires an accurate prediction of material behavior and forming abilities, especially for aluminum alloys which exhibit generally a low formability compared with typical mild steels. This study presents an original technique based on the use of a cruciform shape for experimental characterization and numerical prediction of forming limit curves (FLCs). By using a cruciform shape, the whole forming limit diagram is covered with a unique geometry thanks to the control of the displacements in the two main directions of the specimen. The test is frictionless and the influence of linear and non-linear strain paths can be easily studied since the strain path is controlled by the imposed displacements, independently on the specimen geometry. The influence of strain paths is first studied by introducing a linear prestrain (uniaxial, plane strain or equi-biaxial), in rolling direction. Afterwards non linear prestrain paths arealso tested.