Dynamic Constitutive Relation and Fracture Model of Q235A Steel

Abstract:

Strength and ductility data for Q235A steel from 20 oC to 950 oC was obtained from a series of experimental tests. The stress rate sensitivity was studied by conducting Split-Hopkinson Tension Bar (SHTB) test and uniaxial tension test on smooth cylindrical specimens while the influence of stress triaxiality on ductility was revealed by conducting upsetting tests, tension tests on pre-notched cylinder specimens and torsion tests on SASs. Slightly modified versions of the two Johnson–Cook (J–C) models describing flow stress and fracture strain are presented to characterize the properties of Q235A steel as function of strain rate, temperature and stress triaxiality. Corresponding model parameters were calibrated based on the test data and with the help of finite element calculation. It was found that the modified Johnson–Cook (MJC) models give more close predictive results compared with the original J–C models.

• Periodical: Applied Mechanics and Materials (Volume 274)
• Pages: 463-466
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.274.463
• Online since: January 2013
• Authors: Li Lin, Feng Fan, Xu Dong Zhi
• Keywords: Constitutive Model, Fracture Criterion, Johnson-Cook, Q235A Steel

References

[1] A. Kane, T. Børvik, O.S. Hopperstad, M. Langseth, Finite Element Analysis of Plugging Failure in Steel Plates Struck by Blunt Projectiles, J. Appl. Mech. 76(2009)051302-1-11.

DOI: 10.1115/1.3129722

[2] X. Xiao, W. Zhang, G. Wei, Z. Mu, Z. Guo, Experimental and numerical investigation on the deformation and failure behavior in the Taylor test, Mater. Des. 32(2011)2663-74.

DOI: 10.1016/j.matdes.2011.01.016

[3] A.H. Clausen, T. Børvik, O.S. Hopperstad, A. Benallal, Flow and Fracture Characteristics of Aluminium Alloy AA5083-H116 as Function of Strain Rate, Temperature and Triaxiality, Mater. Sci. Eng. A. 364(2004)260-72.

DOI: 10.1016/j.msea.2003.08.027

[4] G.E. Dieter. Mechanical Metallurgy, McGraw Hill, New York, (1988).

[5] G.R. Johnson, W.H. Cook, A constitutive model and data for metals subjected to large strains, high strain rates and high temperatures. In: Seventh International Symposium on Ballisticsm, The Netherlands: The Hague. pp.1-7; (1983).

[6] M.G. Cockroft, D. J . Latham, Ductility and the Workability of Metals, J. Inst. Metals. 96(1968)33-9.

[7] G.R. Johnson, W.H. Cook, Fracture characteristics of three metals subjected to various strains, strain rates, temperatures and pressures, Eng. Fract. Mech. 21(1985)31-48.

DOI: 10.1016/0013-7944(85)90052-9