Investigation of a Bulge Test at High Temperatures and High Strain Rates Using a Finite-Element Simulation Study

Alexander Braun; Markus Bambach; Gerhard Hirt

doi:10.4028/www.scientific.net/KEM.622-623.300

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 622-623Investigation of a Bulge Test at High Temperatures...

Investigation of a Bulge Test at High Temperatures and High Strain Rates Using a Finite-Element Simulation Study

Abstract:

In recent years, hot stamping of sheet metal parts has emerged to satisfy the contrary demands of the automotive industry for components with increased strength at reduced weight. To analyse the material behaviour during these processes, a hot gas bulge test at high temperatures and high strain rates is promising, since the bulge test at room temperature has already proven itself as a useful test for the material characterization of sheet metals up to high strains. Therefore, a hot gas bulge test at elevated temperatures and high strain rates is being developed at the Institute of Metal Forming (IBF) in cooperation with the Institute for Fluid Power Drives and Controls (IFAS) at the RWTH Aachen. To verify if the concepts of the membrane theory, which are used for the evaluation of bulge tests at room temperature, are adaptable to such a hot gas bulge test, a simulation study using finite element calculations was conducted. The purpose of this simulation study is is to estimate the errors which occur if the equivalent stress at the bulge pole is calculated by using the membrane theory. In addition to this study several approaches were examined to obtain the sheet thickness at the bulge pole by measuring the bulge height. The study showed that a hot gas bulge test can be described very well by the membrane theory if the sheet thickness, the curvature at the bulge pole and the pressure inside the bulge are exactly known. However, substantial errors can occur if the sheet thickness at the bulge pole is determined by measuring the height of the bulge pole.

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Periodical:

Key Engineering Materials (Volumes 622-623)

Pages:

300-307

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.622-623.300

Citation:

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Online since:

September 2014

Authors:

Alexander Braun*, Markus Bambach, Gerhard Hirt

Keywords:

Bulge Test, Hot Deformation, Material Characterization

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* - Corresponding Author

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