Experimental Study on Low Cycle Fatigue Properties of Different Hydrogen Containing Steel Bars After Electrochemical Repair
GONG Yuanjun1,2, ZHANG Jun2, MAO Jianghong2, JIN Weiliang2, TAN Yu3, LUO Lin1
1 School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China 2 Ningbo Tech University, Ningbo 315100, China 3 Zhejiang Zhoushan North Channel Co., Ltd., Zhoushan 316000, China
Abstract: This paper attempts to analyze the fatigue life, hysteresis curve, residual strength and other mechanical indexes of steel bars with hydrogen by virtue of experiment on electrochemical hydrogen permeation and low cycle fatigue. Results show that the longer the electrification time and the higher the current density, the more the hydrogen content in the steel. And the linear relationship between the hydrogen content and the electric flux density is established. According to the relationship between the hydrogen content and the fatigue life, the negative effects of the electrochemical repair are divided into three areas. With the increasing hydrogen content, the degradation of the cyclic residual strength accelerates, meanwhile the fatigue life and energy consumption capacity decrease significantly. When the hydrogen content is less than 1.7×10-6, the low-cycle fatigue life of steel specimens decreases by less than 15% with 1% strain range. When the hydrogen content is 4.3×10-6, the low-cycle fatigue life of the steel specimens decreases by 73.7%. This study provides a reference for the application of electrochemical repair technology on concrete structures with seismic requirements.
龚园军, 张军, 毛江鸿, 金伟良, 谭昱, 罗林. 电化学修复后不同含氢钢筋的低周疲劳性能试验研究[J]. 材料导报, 2021, 35(6): 6146-6150.
GONG Yuanjun, ZHANG Jun, MAO Jianghong, JIN Weiliang, TAN Yu, LUO Lin. Experimental Study on Low Cycle Fatigue Properties of Different Hydrogen Containing Steel Bars After Electrochemical Repair. Materials Reports, 2021, 35(6): 6146-6150.
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2021, Vol. 35 
