Strength and ductility of Q235B steel as function of strain rate, temperature and stress triaxiality
Lin Li 1,2, Zhi Xu-dong 1, FanFeng 1, MENG Sheng-jiu2, Su Jun-jie 1
1. School of Civil Engineering, Harbin Institute of TechnologyNo. 77 Huanghe Road, Nangang District, Harbin 150090, PR China2. College of Civil Engineering and Architecture, Harbin University of Science and TechnologyNo. 52 Xuefu Road, Nangang District, Harbin 150080, PR China
Strength and ductility data for Q235B steel from 20 ℃ to 950 ℃ was obtained from tension tests with smooth cylindrical specimens (SCSs). The strain rate sensitivity was studied by conducting Split-Hopkinson Tension Bar (SHTB) test and uniaxial tension test on SCSs, while the influence of stress triaxiality on ductility was revealed by conducting upsetting tests on cylinder specimens, tension tests on pre-notched cylinder specimens and torsion tests on SCSs. Slightly modified versions of the two Johnson-Cook (J-C) models describing flow stress and fracture strain are presented to characterize the properties of Q235B 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. The validity of the model parameters was verified by Taylor test.
林莉;支旭东;范锋;孟上九;苏俊杰. Q235B钢Johnson-Cook模型参数的确定[J]. , 2014, 33(9): 153-158.
Lin Li;Zhi Xu-dong;FanFeng;MENG Sheng-jiu;Su Jun-jie . Strength and ductility of Q235B steel as function of strain rate, temperature and stress triaxiality. , 2014, 33(9): 153-158.
2014, Vol. 33 
