考虑应变时效影响的Q460C高强钢力学性能试验研究  

Experimental Study on Mechanical Properties of Q460C High Strength Steel Considering Effect of Strain Aging

作　　者：王燕[1,2] 李珂皓 杨怡亭 WANG Yan;LI Ke-hao;YANG Yi-ting(School of Civil Engineering,Qingdao University of Technology,Qingdao 266033,Shandong,China;Cooperative Innovation Center of Engineering Construction and Safety in Shandong Blue Economic Zone,Qingdao University of Technology,Qingdao 266033,Shandong,China)

机构地区：[1]青岛理工大学土木工程学院,山东青岛266033 [2]青岛理工大学山东省蓝色经济区工程建设与安全协同创新中心,山东青岛266033

出　　处：《建筑科学与工程学报》2022年第5期122-131,共10页Journal of Architecture and Civil Engineering

基　　金：国家重点研发计划项目(2016YFC0701204);国家自然科学基金项目(51908306)。

摘　　要：为深入研究应变时效对Q460C高强钢基本力学性能影响,建立考虑应变时效影响Q460C高强钢应力-应变本构关系曲线,对经应变时效影响的Q460C高强钢进行了试验研究,分析了Q460C高强钢经应变时效后基本力学性能指标,采用修正Ramberg-Osgood模型对试验结果进行拟合。结果表明:Q460C钢经预应变后具有显著的应变硬化现象,屈服强度得到大幅提高,极限应变和断裂应变显著降低,屈强比接近1.0,结构发生脆性断裂的可能性增加;Q460C钢经时效后产生时效硬化现象,试件在各时效之间应力-应变曲线差别较小,经时效硬化后钢材的硬化程度低于应变硬化;采用修正的Ramberg-Osgood模型能够较为准确地拟合经预应变及时效影响后高强钢的应力-应变曲线,拟合结果与试验结果具有较好的一致性;研究内容可为相关工程应用和理论分析提供参考。To further study the effect of strain aging on the basic mechanical properties of Q460 C high strength steel and establish the stress-strain constitutive relationship curve of Q460 C high strength steel considering the effect of strain aging, the effect of strain aging on Q460 C high strength steel was studied by experiment. The mechanical properties of Q460 C high strength steel after strain aging were analyzed. The experimental results were fitted by modified Ramberg-Osgood model.The results show that Q460 C steel has a significant strain hardening phenomenon after pre-straining, the yield strength is greatly improved, the ultimate strain and fracture strain are significantly reduced, the yield-strength ratio is closed to 1.0, and the possibility of brittle fracture is increased. Age hardening occurs in Q460 C steel after aging. The difference of stress-strain curves between different aging is small. The hardening degree of Q460 C steel after age hardening is lower than that of strain hardening. The modified Ramboerg-Osgood model can accurately fit the stress-strain curve of high strength steel after pre-strain and aging, and it is in good agreement with the experimental results. The research contents can provide reference for relevant engineering application and theoretical analysis.

关 键 词：Q460C高强钢 应力-应变本构模型 Ramberg-Osgood模型 预应变 时效 

分 类 号：TU391[建筑科学—结构工程]