Q460高强钢材等向-随动混合强化材性参数校正  

CALIBRATION OF COMBINED ISOTROPIC-KINEMATIC HARDENING PARAMETERS OF Q460 HIGH-STRENGTH STEEL

作　　者：张丽 邱晨 邢佶慧[2] ZHANG Li;QIU Chen;XING Jihui(China Railway Huatie Engineering Design Group Co.,Ltd.,Beijing 100071,China;School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]中铁华铁工程设计集团有限公司(北京院),北京100071 [2]北京交通大学土木建筑工程学院,北京100044

出　　处：《低温建筑技术》2020年第8期19-23,共5页Low Temperature Architecture Technology

基　　金：国家自然科学基金面上项目(51878029,51578045)。

摘　　要：高强钢材工程应用广泛,但其焊接接头处存在脆性断裂倾向。因此,文中针对Q460高强钢母材、焊缝、热影响区进行了系列低周疲劳材性试验,基于Chaboche本构理论,识别了各类Q460高强钢等向-随动混合强化材性参数,可用于准确模拟Q460高强钢缺口材性试件荷载-位移滞回曲线,为高强钢构件、节点及体系的性能研究提供技术支撑。With the popularization of high strength steelin the actual project, brittle fatigue tendency becomes an inevitable problem around its welded connections. Therefore, a series of low-cycle fatigue experiments are conducted on the high strength base material, welds and heat affected zone of Q460 high-strength steel. Additionally, based on the Chaboche constitutive theory, the combined isotropic-kinematic hardening parameters of various Q460 high-strength steels are identified, which can be used to accurately simulate the load-displacement hysteretic curves of notched specimens. Research results of this paper can provide technical support for members,joints and structures made of Q460 high-strength steel.

关 键 词：Q460钢材 低周疲劳 试验 数值模拟 等向-随动混合强化 参数 

分 类 号：TU392.4[建筑科学—结构工程]