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research-article

Forming limit differences in hemispherical dome and biaxial test during equi-biaxial tension on cruciform

[+] Author and Article Information
Chetan P Nikhare

Department of Mechanical Engineering, The Pennsylvania State University Erie, Pennsylvania 16563, USA
cpn10@psu.edu

Emmett Vorisek

Department of Mechanical Engineering, The Pennsylvania State University Erie, Pennsylvania 16563, USA
ejv5072@psu.edu

John R. Nolan

Department of Mechanical Engineering, The Pennsylvania State University Erie, Pennsylvania 16563, USA
jrn5231@psu.edu

John T. Roth

Department of Mechanical Engineering, The Pennsylvania State University Erie, Pennsylvania 16563, USA
jtr11@psu.edu

1Corresponding author.

ASME doi:10.1115/1.4037020 History: Received December 11, 2016; Revised May 07, 2017

Abstract

Traditionally, the mechanical properties of materials have been characterized using the uniaxial tension test. This test is considered adequate for simple forming operations where single axis loading is dominant. Previous studies, however, have noted that the data acquired from this type of testing is not enough and additional details in other axes under simultaneous deformation conditions are important. To analyze the biaxial strain, some studies have suggested using the limiting dome height test and bulge test. However, these tests limit the extent of using multi-axial loading and the resulting stress pattern due to contact surfaces. Therefore, researchers devised the biaxial machine which is designed specifically to provide biaxial stress components using multiple and varying loading conditions. The idea of this work is to evaluate the relationship between the dome test data and the biaxial test data. For this comparison, cruciform specimens with a diamond shaped thinner gage in the center were deformed with biaxial stretching on the biaxial testing machine. In addition, the cruciform specimens were bi-axially stretched with a hemispherical punch in a conventional die-punch setting. Furthermore, in each case, the process was simulated using a 3D model generated on ABAQUS. These models were then compared with the experimental results. The forces on each arm, strain path, forming and formability was analyzed. The differences between the processes were detailed. It was found that biaxial tests eliminated the pressurization effect which could be found in hemispherical dome tests.

Copyright (c) 2017 by ASME
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