强腐蚀桥梁钢Q345的J-C本构模型及数值模拟-《郑州大学学报(工学版)》

文章信息/Info

Title:: Tensile Finite Element Simulation of Q345 Bridge Steel with Strong Corrosion ba＜x＞sed on Johnson-Cook Model

Author(s):: Zhang Hao; Qiao Wenjing; Yang Fan; Zhu Haoyun;; School of Construction Engineering, Xi’an University of Technology;

Keywords:: Strong corrosion; bridge steel Q345; J-C’s model model; finite element simulation; flexible damage

摘要:: 为了研究桥梁钢Q345在强酸腐蚀下的应力流动变化规律，将18根Q345桥梁钢试件置于 36% 工业盐酸中，分别浸泡0 h、1 h、4 h、12 h、48 h、72 h，并通过准静态拉伸试验得到工程应力-应变曲线，利用Origin软件对颈缩前的真应力-应变曲线进行拟合，获得基于Johnson-Cook模型的强腐蚀桥梁钢Q345弹塑性本构关系，在此基础上加入柔性金属损伤演化以模拟钢板的应力流动规律及颈缩破坏，建立ABAQUS有限元模型。结果表明：腐蚀率为0.53%、1.22%、2.47%、4.12%、4.98%的桥梁钢Q345弹性模量分别下降了1.26%、2.36%、4.04%、7.01%、10.93%；名义屈服强度分别下降了0.61%、2.61%、3.56%、5.37%、6.82%；拉伸试验曲线与基于Johnson-Cook模型获得的有限元曲线吻合较好；采用柔性损伤演化能准确地模拟强腐蚀钢材的延性退化行为，验证了该模型的有效性和可行性。

Abstract:: In order to study the stress flow law of bridge steel Q345 under strong acid corrosion , 18 Q345 bridge steel specimens were immersed in 36 % hydrochloric acid for 0 h , 1 h , 4 h , 12 h , 48 h and 72 h , respectively . The engineering stress-strain curves were obtained by quasi-static tensile test . The true stress-strain curves before necking were fitted by Origin software to obtain the elastoplastic constitutive relationship of strong corrosion bridge steel Q345 ba＜x＞sed on Johnson-Cook model .On this basis , ABAQUS finite element model is established , and the damage evolution of flexible me＜x＞tal is added to simulate the stress flow law and necking failure of steel plate .The results show that the elastic modulus of bridge steel Q345 with corrosion rate of 0.53 % , 1.22 % , 2.47 % , 4.12 % and 4.98 % decreases by 1.26 % , 2.36 % , 4.04 % , 7.01 % and 10.93 % respectively , and the yield strength decreases by 0.61 % , 2.61 % , 3.56 % , 5.37 % and 6.82 % respectively . The ultimate tensile strength in the tensile test curve is consistent with the finite element curve obtained ba＜x＞sed on the Johnson-Cook model . The ductile degradation behavior of strongly corroded steel can be accurately simulated by using the flexible damage evolution , which verifies the effectiveness and feasibility of the model .