Dynamic tensile mechanical performance of new high-strength rebars
LI Lei1,2, ZHANG Lei1,2, WEI Jiuqi1,2, HE Xiang1,2, WANG Shihe1,2, ZHANG Chunxiao1,2
1.Research Institute for National Defense Engineering, Academy of Military Science, Luoyang 471023, China;
2.Henan Provincial Key Lab of Special Protective Materials, Luoyang 471023, China
Abstract: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.
李磊1,2,张磊1,2,魏久淇1,2,何翔1,2,王世合1,2,张春晓1,2. 新型高强钢筋动态拉伸力学性能研究[J]. 振动与冲击, 2020, 39(19): 62-68.
LI Lei1,2, ZHANG Lei1,2, WEI Jiuqi1,2, HE Xiang1,2, WANG Shihe1,2, ZHANG Chunxiao1,2. Dynamic tensile mechanical performance of new high-strength rebars. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(19): 62-68.
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