摘要
采用质量分数为5%的NaCl溶液在盐雾腐蚀箱进行30~90 d加速腐蚀试验,研究了盐雾腐蚀对HRB400E钢筋低周疲劳行为和拉伸性能的影响。然后采用轴向位移控制模拟地震载荷对腐蚀钢筋开展了低周疲劳和拉伸试验,获得循环响应特征曲线和应变-寿命曲线。结合SEM断口形貌观察,分析钢筋的低周疲劳断裂机制。结果表明:盐雾腐蚀对钢筋的质量和尺寸有明显影响,钢筋表面产生腐蚀坑;钢筋的力学性能随腐蚀时间增加而降低,腐蚀90 d的断裂伸长率下降率达46.1%,屈服强度在腐蚀30 d以后可能就不再满足标准要求;腐蚀明显削弱了钢筋的抗循环载荷性能,导致低周疲劳寿命下降;腐蚀会减小钢筋的裂纹扩展区面积并加速裂纹扩展。
Accelerated corrosion tests were carried out in salt spray corrosion chamber with 5%NaCl solution for 30-90 days to study the effect of salt spray corrosion on low cycle fatigue behavior and tensile properties of HRB400 E steel bars.Low cycle fatigue and tensile tests were carried out on corroded steel bars under simulated earthquake load controlled by axial displacement,and the cyclic response characteristic curve and strain life curve were obtained.Combined with SEM fracture morphology observation,the low cycle fatigue fracture mechanism of steel bar was analyzed.The results show that the salt spray corrosion has obvious influence on the quality and size of steel bars,and corrosion pits appear on the surface of steel bars.The mechanical properties of steel bars decrease with the increasing of corrosion time.The elongation at break decreases by 46.1%after 90 days of corrosion.The yield strength may no longer meet the standard requirements after 30 days of corrosion.The results show that the corrosion weakens the cyclic load resistance of the steel bars and leads to the decrease of the low cycle fatigue life;the corrosion reduces the area of the crack propagation zone and accelerates the crack propagation.
作者
谌理飞
罗云蓉
付磊
李辉
李秀兰
张应迁
CHEN Lifei;LUO Yunrong;FU Lei;LI Hui;LI Xiulan;ZHANG Yingqian(College of Mechanical Engineering,Sichuari University of Science and Engineering,Zigong 643000,Sichuan,China;College of Civil Engineering,Sichuan University of Science and Engineering,Zigong 643000,Sichuan,China)
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2021年第11期1179-1188,共10页
Journal of Iron and Steel Research
基金
国家自然科学基金资金项目(51701133)
四川省教育厅资助项目(16ZB0255,18ZA0352)
桥梁无损检测与工程计算四川省高校重点实验室资助项目(2018QYJ03,2018QZY01)。
关键词
HRB400E钢筋
盐雾腐蚀
低周疲劳
力学性能
HRB400E steel bar
salt-spray corrosion
low cycle fatigue
mechanical property
