Biaxial tension under bending and compression - development of a new formability test for incremental sheet forming

Biaxial tension under bending and compression - development of a new formability test for incremental sheet forming
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弯曲和压缩下的双轴拉伸 - 开发增量板材成形的新成形性测试

DOI:
10.1088/1757-899x/1270/1/012066
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发表时间:
2022
期刊:
Materials Science and Engineering
影响因子:
--
通讯作者:
Ai S
Ai S
中科院分区:
--
文献类型:
--
作者:
Ai S

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为了研究板料渐进成形中不同变形方式对材料成形性能的影响,提出了一种新的试验方法--双向拉弯压试验方法。采用有限元法模拟材料双向拉伸变形,设计了十字形试件。在BTBC实验测试中,十字形试样可以双向拉伸,并且可以改变两个垂直方向的应变比。此外,可以研究压缩、弯曲和循环载荷的叠加效应。对AA 5251-H22铝合金在平面应变路径下的材料成形性能进行了试验研究。通过测量试件表面圆网格的畸变,得到了试件在不同变形模式下的真实应变。实验结果表明,弯曲和压缩的引入有助于局部材料变形。通过引入弯曲来改善材料的可成形性,通过施加压缩和循环载荷来进一步增强弯曲。BTBC试验克服了ISF成形性研究中常用试验方法的局限性,为ISF中应变路径和加载条件对材料变形和断裂行为的影响提供了基本解释。
A new testing method, Biaxial Tension under Bending and Compression (BTBC), is developed to investigate the effect of different deformation modes on material formability in Incremental Sheet Forming (ISF). A cruciform specimen is designed by simulating the material deformation under biaxial tension using Finite Element (FE) method. In the BTBC experimental testing, the cruciform specimen can be stretched in biaxial directions and the strain ratio of the two perpendicular directions can be varied. Furthermore, the superimposed effect of compression, bending and cyclic loading can be investigated. Material formability of aluminium alloy AA5251-H22 under plane strain path is tested. True strains of the specimen under different deformation modes are obtained by measuring distortions of circular grids inscribed onto the surface of the specimen. The experimental results show that the introduction of bending and compression contributes to localised material deformation. Material formability is improved by the introduction of bending, which is further enhanced by applying compression and cyclic loading. The BTBC test overcomes the limitation of commonly used testing methods in ISF formability studies, providing a fundamental explanation of the effect of strain path and loading conditions on the material deformation and fracture behaviour in ISF.
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