A Numerical Investigation of the Hole Expansion Test
The flanging operation is one of the sheet metal forming processes common in the automotive industry. In the flanging operation, a pierced hole is expanded and a crack often initiates at the hole edge. To investigate the stretch-flangeability of a sheet metal, the hole expansion test is usually conducted. Although the strain state is close to the uniaxial tension at the hole edge, a large tensile strain is achieved before fracture in the hole expansion test compared to the uniaxial tension. In this work, the reason for such a large strain is analyzed using the finite element simulations. The deformation and strain distribution of the hole expansion test are compared with the specially devised hole expansion tests with slits.
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Document Type: Research Article
Publication date: 2012-07-01
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