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Vol. 29. Issue 1.
Materiais 2015
Pages e239-e243 (January - April 2017)
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Vol. 29. Issue 1.
Materiais 2015
Pages e239-e243 (January - April 2017)
DOI: 10.1016/j.ctmat.2016.06.007
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Mechanical properties determination of dual-phase steels using uniaxial tensile and hydraulic bulge test
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Rui Amarala,
Corresponding author
ramaral@inegi.up.pt

Corresponding author.
, Abel D. Santosab, A.B. Lopesc
a INEGI – Institute of Science and Innovation in Mechanical and Industrial Engineering, Rua Dr. Roberto Frias, 400, 4200-465 Porto, Portugal
b FEUP – Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
c Department of Material and Ceramic Engineering, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
Article information
Abstract

Numerical simulations of sheet metal forming processes need the establishment of highly reliable results, which in turn need the accurate identification of mechanical properties. In this paper a study is presented on the choice of the characterization function of flow stress-strain curve of sheet metal materials, as well as the selection of the best yield locus, based on experimental uniaxial tensile and biaxial hydraulic bulge tests performed on dual-phase steels of industrial interest. To obtain a better characterization of the hardening curve, a combination is made using the uniaxial tensile test data with biaxial hydraulic bulge test results, since bulge test covers a larger range of plastic strain when compared to tensile test. Since the two flow curves have different strain paths, they can’t be directly compared or combined. Therefore, it is necessary a transformation of flow stress-strain curve provided from biaxial bulge test into equivalent stress-strain curve. Different methodologies were applied to transform biaxial stress-strain curve to an equivalent one and the different results are compared and evaluated.

Keywords:
Sheet metal forming
dual-phase steels
flow curve
biaxial hydraulic bulge
yield locus
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Copyright © 2017. Portuguese Society of Materials (SPM)
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