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International Journal of Applied Science and Mathematics
Volume 6, Issue 5, ISSN (Online): 2394-2894
Determination Method of Stress Triaxiality of
Advanced High Strength Dual Phase Steel
Yaomin Li, Di Li*, Meng Han, Ning Jiang and Jia-chuan Xu School of Transportation and Vehicle Engineering, Shandong University of Technology, China, Shandong,
Zibo, Zhangdian, 255049.
Date of publication (dd/mm/yyyy): 04/10/2019
Abstract – This study focus on the stress triaxiality under shear failure of advanced high-strength dual-phase steel.
Stress triaxiality, as a parameter to characterize the stress state of a material, is a key factor in controlling the fracture
mode of a material, so it is used in many material failure models. Firstly, the tensile test of tensile specimens and shear
specimens of advanced high-strength dual-phase steel was carried out by static tensile test. The relevant mechanical
parameters of the sheet material can be obtained from the tensile specimen; the fracture angle analysis of the shear
state of the shear failure is obtained, and the method for determining the stress triaxiality of the sheet material is
obtained. Furthermore, the VUMAT subroutine was written based on the Hill'48 yield criterion and the Mohr-
Coulomb (MMC) failure criterion. The finite element simulation software ABAQUS was used to simulate the numerical
simulation of the specimen. Finally, the simulation data is analyzed and the experimental data is used to verify the
International Journal of Applied Science and Mathematics
Volume 6, Issue 5, ISSN (Online): 2394-2894
It can be seen from the figure that after correction, the error between the triaxiality of the simulation and the
triaxiality curve calculated by the derivation formula is already very small, and the maximum error of the stress
triaxiality of the five angle specimens is 2.9%, 1.9%, 2.1%, 2.3% and 2.6% respectively, verifying the rationality
of the derived equivalent plastic strain formula and the stress triaxial formula. Using the same method to process
the advanced high-strength dual-phase steel DP590, DP980 and DP1180 experimental data and simulation data,
the same reasonable results can be obtained.
IV. CONCLUSION
1. Firstly, by calculating the stress state of advanced high-strength dual-phase steel, the calculation formulas of
stress triaxiality and equivalent plastic strain are derived. When testing the shear specimen, the actual fracture
surface and the estimated fracture surface are the gap in the angle of rotation leads to a gap between the test
results and the simulation.
2. Secondly, this paper estimates the deformation of the actual fracture surface by the deformation law of the
transverse marking line of the specimen, and establishes the correction function of the angle change of the
actual fracture surface.
3. Finally, through the comparison of simulation and experimental data, it is proved that the rationality of the
method for determining the stress triaxiality of advanced high-strength dual-phase steel has been revised and
paved the way for future research.
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AUTHORS PROFILE’
Yaomin Li, School of Transportation and Vehicle Engineering, Shandong University of Technology, China, Shandong,
Zibo, Zhangdian, 255049. Master in reading, Male, You can contact with the Yaomin Li, email di: [email protected], Thank you!
Di Li*, School of Transportation and Vehicle Engineering, Shandong University of Technology, China, Shandong, Zibo, Zhangdian, 255049 (Correspondence author). Doctor of Engineering, Male, Associate professor. You can contact
International Journal of Applied Science and Mathematics
Volume 6, Issue 5, ISSN (Online): 2394-2894
Meng Han, School of Transportation and Vehicle Engineering, Shandong University of Technology, China, Shandong, Zibo, Zhangdian, 255049, Master in reading, Famale.
Ning Jiang, School of Transportation and Vehicle Engineering, Shandong University of Technology, China, Shandong, Zibo, Zhangdian, 255049, Master in reading, Famale.
Jiachuan Xu, School of Transportation and Vehicle Engineering, Shandong University of Technology, China, Shandong, Zibo, Zhangdian, 255049, Master in reading, Male.