Mechanical properties determination of dual-phase steels using uniaxial tensile and hydraulic bulge test

authors	Amaral, R; Santos, AD; Lopes, AB
nationality	International
journal	CIENCIA & TECNOLOGIA DOS MATERIAIS
author keywords	Sheet metal forming; dual-phase steels; flow curve; biaxial hydraulic bulge; yield locus
keywords	SHEET METALS; STRESS
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. (C) 2017 Portuguese Society of Materials (SPM). Published by Elsevier Espana, S.L.U. All rights reserved.
publisher	ELSEVIER ESPANA S I
issn	0870-8312
year published	2017
volume	29
issue	1
beginning page	E239
ending page	E243
digital object identifier (doi)	10.1016/j.ctmat.2016.06.007
web of science category	Materials Science, Multidisciplinary
subject category	Materials Science
unique article identifier	WOS:000412098700046