NPR钢筋力学性能试验研究  

Experimental Study on Mechanical Properties of NPR Steel Bar

作　　者：商怀帅[1] 邵姝文 冯海暴 李永升 SHANG Huaishuai;SHAO Shuwen;FENG Haibao;LI Yongsheng(School of Civil Engineering,Qingdao University of Technology,Qingdao 266033,Shandong,China;China Communications No.1 Aviation Bureau Company,Tianjin 300000,China;Qingdao Aviation Engineering Test Company,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]中交一航局有限公司,天津300000 [3]青岛中航工程试验检测有限公司,山东青岛266033

出　　处：《材料导报》2022年第10期182-188,共7页Materials Reports

基　　金：国家自然科学基金资助项目(51778310);滨海城乡建设工程安全与性能提升研究创新团队项目;山东省“双一流”建设工程-土木。

摘　　要：国内研发了一种新型高强、高延性钢筋——NPR(Negative poisson ratio)钢筋,该新型钢筋具有无磁、抗腐蚀、抗强磁场磁化的特点。本工作对NPR钢筋的化学成分、洛式硬度、金相组织及静载拉伸力学性能进行了试验研究与分析。结果表明,NPR钢筋中的C、Mn元素含量较HRB400钢筋存在明显差异,其洛式硬度较HRB400钢筋有所提高,NPR钢筋的金相组织为全奥氏体;NPR钢筋在拉伸过程中无明显颈缩现象,宏观断口形貌呈韧性断裂特征。应力-应变曲线表明其屈服平台消失,无明显屈服强度;NPR钢筋的屈服强度、抗拉强度、断后伸长率、最大力总伸长率等力学性能指标较HRB400钢筋均有显著提高。基于试验结论,采用Ramberg-Osgood模型对NPR钢筋实测的应力-应变曲线进行了拟合,拟合曲线与实测曲线吻合较好。本工作可为NPR新型钢筋的推广和应用提供理论依据。Anew type of high strength and high ductility steel bar(negative poisson ratio(NPR)steel bar)has been developed in China.The new steel bar also has the characteristics of non-magnetic,anti-corrosion and strong magnetic field magnetization resistance.In this work,the chemical composition,Rockwell hardness,metallographic structure and static tensile mechanical properties of the NPR steel bars have been tested and analyzed.The results show that the content of C and Mn in NPR steel bars is significantly different from that in HRB400 steel bars.Its Rockwell hardness is higher than that of HRB400 steel bars and the metallographic structure of NPR steel bars shows that it is a fully austenitic material.NPR steel bars have no obvious necking phenomenon during the stretching process,and the macroscopic fracture morphology shows ductile fracture characteristics.The stress-strain curve of NPR steel bars shows that its yield platform disappears and there is no obvious yield strength.The mechanical properties of NPR steel bars,such as yield strength,tensile strength,elongation after fracture and total elongation at maximum force,are significantly higher than those of HRB400 steel bars.Based on the experimental conclusions,the Ramberg-Osgood model is used to fit the measured stress-strain curve of NPR steel bars,and the fitting curve is in good agreement with the measured curve.This work can provide a theo-retical basis for the promotion and application of NPR new steel bars.

关 键 词：NPR钢筋 化学成分 金相组织 力学性能 Ramberg-Osgood模型 

分 类 号：TU375[建筑科学—结构工程]