摘要
为了获取钢筋在不同应变率下的动态拉伸力学性能参数,利用动载试验机和分离式霍普金森拉杆对HRB400、HRB500高强钢筋和HTRB600、HTRB700新型高强钢筋进行了静态、快速和高速拉伸试验,试验中测得了不同应变率下的应力—应变曲线,并拟合得到动态力学性能参数。结果表明,4种钢筋的屈服强度和抗拉强度随应变率的增长均有提高,强度低的钢筋提高比例较大,屈服强度的提高比例大于抗拉强度的提高比例,弹性模量、塑性段切线模量和最大力总伸长率基本不受应变率影响。应变率的计算应区分弹性段和塑性段,基于不同的应变率计算方法可得到不同的本构模型参数,使用时应加以区别。
In order to study dynamic tensile performance of new high-strength rebars under different strain rates,quasi-static,rapid and high-speed tension tests were conducted for high-strength rebars of HRB400 and HRB500,and new high-strength rebars of HTRB600 and HTRB700 by using dynamic load testing machine and split Hopkinson tension bar(SHTB)to measure their stress-strain curves under different strain rates,and obtain their dynamic mechanical performance parameters through fitting.Results showed that for the 4 types of rebars,their yield strength and tensile strength increase with increase in strain rate,the increase proportion of lower strength rebars is bigger,the increase proportion of yield strength is larger than that of tensile strength;elastic modulus,plastic tangent modulus and total elongation at maximum force are not influenced by strain rate basically;strain rate calculation should be divided into elastic phase and plastic one;different constitutive model parameters can be obtained with different calculation methods of strain rate,so these methods should be used differently.
作者
李磊
张磊
魏久淇
何翔
王世合
张春晓
LI Lei;ZHANG Lei;WEI Jiuqi;HE Xiang;WANG Shihe;ZHANG Chunxiao(Research Institute for National Defense Engineering,Academy of Military Science,Luoyang 471023,China;Henan Provincial Key Lab of Special Protective Materials,Luoyang 471023,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2020年第19期62-68,106,共8页
Journal of Vibration and Shock
基金
河南省科技创新人才计划(154200510028)。
关键词
新型高强钢筋
应变率
强度
伸长率
本构模型
new high-strength rebar
strain rate
strength
elongation
constitutive model
