A simple approach is proposed to employ symmetric yield functions for modeling the tension-compression asymmetry commonly observed in hcp materials. In this work, the strength differential (SD) effect is modeled by choosing separate symmetric plane stress Barlat Yld 2000 yield functions for the tension i.e., in the first quadrant of principal stress space, and compression i.e., third quadrant of principal stress space. In the second and fourth quadrants, the yield locus is constructed by adopting Bézier interpolating functions between uniaxial tensile and compressive stress states. The main advantage of this proposed approach is that the yield locus parameters are deterministic and relatively easy to identify when compared to the Cazacu-Plunkett-Barlat (CPB) family of yield functions commonly used for modeling the SD effect observed in hcp materials. The proposed yield function is implemented as a user material subroutine (UMAT) within the commercial finite element software, LS-DYNA. The predictions of the developed material model are compared with the measured load-displacement and strain distributions from a three-point bend experiment on AZ31B sheet.
ASME 2014 International Manufacturing Science and Engineering Conference collocated with the JSME 2014 International Conference on Materials and Processing and the 42nd North American Manufacturing Research Conference
June 9–13, 2014
Detroit, Michigan, USA
Conference Sponsors:
- Manufacturing Engineering Division
ISBN:
978-0-7918-4581-3
PROCEEDINGS PAPER
Modeling of Strength Differential Effects in HCP Sheet Materials
Srihari Kurukuri
,
Srihari Kurukuri
University of Waterloo, Waterloo, ON, Canada
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Michael Worswick
Michael Worswick
University of Waterloo, Waterloo, ON, Canada
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Author Information
Srihari Kurukuri
University of Waterloo, Waterloo, ON, Canada
Michael Worswick
University of Waterloo, Waterloo, ON, Canada
Paper No:
MSEC2014-4134, V002T02A084; 6 pages
Published Online:
October 3, 2014
Citation
Kurukuri, Srihari, and Worswick, Michael. "Modeling of Strength Differential Effects in HCP Sheet Materials." Proceedings of the ASME 2014 International Manufacturing Science and Engineering Conference collocated with the JSME 2014 International Conference on Materials and Processing and the 42nd North American Manufacturing Research Conference. Volume 2: Processing. Detroit, Michigan, USA. June 9–13, 2014. V002T02A084. ASME. https://doi.org/10.1115/MSEC2014-4134
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