Experimental Study and Prediction Model of Low Temperature Mechanical Properties of High-Strength Steel

doi:10.16183/j.cnki.jsjtu.2022.526

Abstract

Abstract:

The application of high-strength steel in extremely cold polar regions can reduce steel consumption and save the cost of fabrication, transportation, and installation of steel structures in the harsh low-temperature environment. In order to study the mechanical properties of HG785 high-strength steel under polar low-temperature conditions, uniaxial tensile tests were conducted on high-strength steel coupons by considering two thicknesses and five low-temperature cases. It was found that the elastic modulus, yield strength, and ultimate tensile strength of HG785 high-strength steel in polar low-temperature environment are higher than those at an ambient temperature of 25 ℃. All tensile coupon specimens failed by traditional necking in a ductile manner without brittle failure tendency. Based on the test results, accurate prediction models for mechanical properties of HG785 high-strength steel in polar low-temperature environment were established by the best subset regression analysis. This will facilitate the application of high-strength steel in the design of structural members, joints, and systems in an efficient manner, and provide theoretical support for the promotion of high-strength steel structures in polar low-temperature regions.

Key words: high-strength steel, uniaxial tensile test, low temperature mechanical properties, prediction model

CLC Number:

TU391

CAI Ao, CHEN Mantai, ZUO Wenkang, DUAN Liping, ZHAO Jincheng. Experimental Study and Prediction Model of Low Temperature Mechanical Properties of High-Strength Steel[J]. Journal of Shanghai Jiao Tong University, 2024, 58(11): 1707-1715.

Figures/Tables 10

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试样	t/ mm	T/ ℃	E_T/ GPa	E_T/ E_Ta	I_E,P	f_yT/ MPa	f_yT/ f_yTa	I_fy,P	f_uT/ MPa	f_uT/ f_uTa	I_fu,P	I_E,Test/ I_E,P	I_fy,Test/ I_fy,P	I_fu,Test/ I_fu,P
H6T25	6	25	186	1.00	1.00	615	1.00	1.00	699	1.00	1.00	1.000	1.000	1.000
H6T-20	6	-20	190	1.02	1.08	695	1.13	1.06	833	1.19	1.07	0.951	1.062	1.110
H6T-40	6	-40	205	1.10	1.12	747	1.22	1.10	835	1.20	1.11	0.987	1.107	1.073
H6T-60	6	-60	214	1.15	1.16	726	1.18	1.14	855	1.22	1.16	0.988	1.039	1.056
H6T-75	6	-75	226	1.21	1.20	756	1.23	1.17	847	1.21	1.20	1.009	1.053	1.014
H8T25	8	25	193	1.00	1.00	627	1.00	1.00	704	1.00	1.00	1.000	1.000	1.000
H8T-20	8	-20	201	1.04	1.08	686	1.10	1.06	799	1.14	1.07	0.967	1.029	1.057
H8T-40	8	-40	210	1.09	1.12	650	1.04	1.10	745	1.06	1.11	0.972	0.945	0.950
H8T-60	8	-60	238	1.24	1.16	662	1.06	1.14	790	1.12	1.16	1.061	0.929	0.969
H8T-75	8	-75	218	1.13	1.20	729	1.16	1.17	865	1.23	1.20	0.940	0.996	1.027
平均值												0.988	1.016	1.026
变异系数												0.034	0.054	0.049

序号	变量	R²	调整后R²	C_p	AIC	SBC
1	T	0.80	0.77	1.00	-34.16	-33.25
2	t	0.00	-0.12	28.72	-18.15	-17.24
3	E_Ta	0.00	-0.12	28.72	-18.15	-17.24
4	t,T	0.80	0.74	3.00	-32.16	-30.95
5	T,E_Ta	0.80	0.74	3.00	-32.16	-30.95
6	t,E_Ta	0.00	-0.12	28.72	-16.15	-14.94
7	t,T,E_Ta	0.80	0.74	3.00	-30.16	-28.65

序号	变量	R²	调整后R²	C_p	AIC	SBC
1	T	0.53	0.47	8.03	-25.38	-24.47
2	t	0.24	0.14	16.78	-20.54	-19.63
3	f_yTa	0.24	0.14	16.78	-20.54	-19.63
4	t,T	0.77	0.70	3.00	-30.34	-29.13
5	T,f_yTa	0.77	0.70	3.00	-30.34	-29.13
6	t,f_yTa	0.24	0.14	16.78	-18.54	-17.33
7	t,T,f_yTa	0.77	0.70	3.00	-28.34	-26.82

序号	变量	R²	调整后R²	C_p	AIC	SBC
1	T	0.65	0.61	3.86	-27.51	-26.60
2	f_uTa	0.10	-0.01	19.30	-18.09	-17.18
3	t	0.10	-0.01	19.30	-18.09	-17.18
4	T,f_uTa	0.75	0.68	3.00	-28.94	-27.73
5	t,T	0.75	0.68	3.00	-28.94	-27.73
6	t,f_uTa	0.10	-0.01	19.30	-16.09	-14.88
7	t,T,f_uTa	0.75	0.68	3.00	-26.94	-25.42