NPR钢筋力学性能试验研究

doi:10.11896/cldb.21010164

材料导报

2022, Vol. 36

Issue (10): 21010164-7 https://doi.org/10.11896/cldb.21010164

金属与金属基复合材料

NPR钢筋力学性能试验研究

商怀帅^1,*, 邵姝文¹, 冯海暴², 李永升³

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

Experimental Study on Mechanical Properties of NPR Steel Bar

SHANG Huaishuai^1,*, SHAO Shuwen¹, FENG Haibao², LI Yongsheng³

1 School of Civil Engineering, Qingdao University of Technology, Qingdao 266033,Shandong, China
2 China Communications No.1 Aviation Bureau Company, Tianjin 300000,China
3 Qingdao Aviation Engineering Test Company, Qingdao 266033,Shandong, China

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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。

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	商怀帅
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关键词: NPR钢筋化学成分金相组织力学性能 Ramberg-Osgood模型

Abstract: 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.

Key words: NPR steel bar chemical composition microstructure mechanical properties Ramberg-Osgood model

发布日期: 2022-05-24

ZTFLH:

TU375

基金资助: 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

通讯作者: shanghuaishuai@163.com

作者简介: 商怀帅,青岛理工大学教授、博士研究生导师。2007年获得大连理工大学土木工程专业博士学位。主要从事钢筋混凝土结构的研究,包括混凝土的耐久性、钢筋与混凝土的粘结性能、混凝土在复杂应力状态下的破坏准则和钢筋混凝土构件的承载力。在国内外期刊上发表论文70余篇,先后获得国家授权发明专利10项,获省部级奖励5项。

引用本文:

商怀帅, 邵姝文, 冯海暴, 李永升. NPR钢筋力学性能试验研究[J]. 材料导报, 2022, 36(10): 21010164-7.
SHANG Huaishuai, SHAO Shuwen, FENG Haibao, LI Yongsheng. Experimental Study on Mechanical Properties of NPR Steel Bar. Materials Reports, 2022, 36(10): 21010164-7.

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http://www.mater-rep.com/CN/10.11896/cldb.21010164 或 http://www.mater-rep.com/CN/Y2022/V36/I10/21010164

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