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采用液氮降温的方式,对HRB335、HRB400以及特种低温钢筋共21组63个试件进行不同温度下的拉伸试验,分析不同种类钢筋在20,-40,-80,-100,-120,-140,-165℃下的力学性能及变化趋势。试验研究表明:随着温度降低,三种钢筋的屈服强度fy和抗拉强度fu均呈增大趋势,钢筋的断后伸长率δ5和断后收缩率ψ减小,说明钢筋的塑性随着温度降低而降低;三种钢筋的弹性模量与温度相关性不大,其值基本围绕着某一定值上下波动;不同温度下钢筋的应力-应变曲线的形状基本类似,但随着温度的降低,钢筋的极限应变不断减小,这也说明钢筋的塑性呈减小趋势。
Tensile tests were carried out on 63 specimens of 21 sets of HRB335, HRB400 and special low temperature steel bars by liquid nitrogen cooling method. The tensile tests of different kinds of steel bars at 20, -40, -80, -100, -120, -140, -165 ℃ under the mechanical properties and trends. Experimental results show that as the temperature decreases, the yield strength fy and tensile strength fu of the three kinds of steel tend to increase, while the post-extension elongation δ5 and post-shrinkage ψ of the steel tend to decrease, indicating that the plasticity of the steel decreases as the temperature decreases The elastic modulus of the three kinds of steel has little correlation with the temperature, and the value of the three kinds of steel fluctuates around a certain value; the shape of the stress-strain curve of the steel is basically similar under different temperatures, but as the temperature decreases, The ultimate strain continues to decrease, which also shows the plastic tend to decrease.