建筑结构学报2024，Vol.45Issue(1)：47-57,11.DOI:10.14006/j.jzjgxb.2023.0351
Q690D-QT高强钢材的高温动态拉伸力学性能
Tensile mechanical properties of Q690D-QT at high temperatures and high strain rate
摘要
Abstract
Through the steady-state test and high-temperature SHTB test of domestic high-strength steel Q690D-QT,the quasi-static and dynamic tensile mechanical properties of the steel at 20-700 ℃ were investigated.The steady-state test results show that the elastic modulus and the nominal yield strength f0.2 and f0.5(f0.2 is the intersection point of the stress-strain curve and the proportional line offset by 0.2％strain,f0.5 is determined from the intersection of the stress-strain curve and vertical line at 0.5％strain)decrease continuously with the increase of temperature,while the nominal yield strength f1.0,f1.5,f2.0(f1.0,f1.5 and f2.0aredetermined from the intersection of the stress-strain curve and vertical line at 1.0％,1.5％,and 2.0％strain)and ultimate strength first increased slightly between 200-300 ℃ and then decreased continuously.The dynamic test results show that the strain rate effect of tensile yield strength at 700 ℃is more significant than that at room temperature.With polynomial fitting,prediction formulae were obtained for the elastic modulus,yield strength,and ultimate strength reduction coefficient.The Johnson-Cook model parameters(A=760 MPa,B=402 MPa,n=0.534,C=0.004,m=0.966)were determined to describe the high-temperature dynamic tensile mechanical properties of Q690D-QT high-strength steel at temperature ranging from 20 ℃ to 700 ℃and at a strain rate of 1 000 s-1.关键词
高强钢/高温/准静态试验/动态试验/拉伸力学性能Key words
high-strength steel/elevated temperature/quasi-static test/dynamic test/tensile mechanical property分类
建筑与水利引用本文复制引用
陈素文,魏鑫纳,李国强..Q690D-QT高强钢材的高温动态拉伸力学性能[J].建筑结构学报,2024,45(1):47-57,11.基金项目
国家自然科学基金项目(51878506). （51878506）
