扭转预应变对Q345R钢超低周疲劳性能影响研究
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摘要
采用横向应变控制方法,研究了扭转预应变对压力容器用钢Q345R超低周疲劳性能的影响。获得了预扭转前后材料的循环应力-应变关系、疲劳寿命等实验数据,据此,利用双参数威布尔分布数概率函数对疲劳寿命数据进行处理,结果表明其疲劳寿命以及置信度在双对数坐标系中的线性关系良好。通过Hollomon公式和MansonCoffin公式拟合疲劳实验数据,建立了疲劳寿命预测公式。计算并拟合了材料塑性应变能和循环周次的关系,并对比研究了预扭转前后材料的循环韧度。试样疲劳断口观察表明预扭转的材料比未预扭转的材料断口形貌中有较多的子孔洞、空穴和二次裂纹。
Extremely low cycle fatigue(ELCF) properties of pressure vessel steel Q345R steel with torsional pre-strain were investigated. The fatigue tests were conducted on a MTS 809 servo-hydraulic material testing machine. The tests were run under uniaxial tension-compression loading with total lateral strain control. The ELCF behaviors, such as cyclic stress response characteristics, cyclic stress-strain relationships, and the fatigue life were investigated. The fatigue lives were processed by Weibull double parameters probability function, and the results revealed good linear correlations between the fatigue lives and the confidence level in the double logarithmic coordinate. The strain-life data from the axial tests were used to derive suitable Hollomon and Coffin-Manson parameters for the test material. And the fatigue life prediction models were obtained.Moreover, the relationship between the plastic strain energy and the cycles was calculated and the cyclic toughness was analyzed. The scanning electron microscope(SEM) micrographs revealed that compared to the material without pre-strain, the fracture of the torsional pre-strained material has more cavities, voids and secondary cracks.
Extremely low cycle fatigue(ELCF) properties of pressure vessel steel Q345R steel with torsional pre-strain were investigated. The fatigue tests were conducted on a MTS 809 servo-hydraulic material testing machine. The tests were run under uniaxial tension-compression loading with total lateral strain control. The ELCF behaviors, such as cyclic stress response characteristics, cyclic stress-strain relationships, and the fatigue life were investigated. The fatigue lives were processed by Weibull double parameters probability function, and the results revealed good linear correlations between the fatigue lives and the confidence level in the double logarithmic coordinate. The strain-life data from the axial tests were used to derive suitable Hollomon and Coffin-Manson parameters for the test material. And the fatigue life prediction models were obtained.Moreover, the relationship between the plastic strain energy and the cycles was calculated and the cyclic toughness was analyzed. The scanning electron microscope(SEM) micrographs revealed that compared to the material without pre-strain, the fracture of the torsional pre-strained material has more cavities, voids and secondary cracks.
引文
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[3]Tao C.Extremely low cycle fatigue assessment of thickwalled steel piers[D].Nagoya:Nagoya University,2007.
[4]Wei Yaobing,Huang Jianlong,Jin Wuyin,et al.Several problems in the design of ultra-low cycle fatigue fracture[J].Journal of Gansu University of Technology,1998,24(2):109-112.[韦尧兵,黄建龙,靳伍银,等.超低周变幅疲劳断裂设计的几个问题[J].甘肃工业大学学报,1998,24(2):109-112.]
[5]Zhao Xuecai.Study on fracture characteristics of Q235 under ultra-low cycle conditions[D].Lanzhou:Lanzhou University of Technology 2007.[赵学才.超低周条件下Q235的断裂特性研究[D].兰州:兰州理工大学.2007.]
[6]Chen Yanqiang,Luo Yunrong,Lin Haibo,et al.Study on the fatigue performance of Q345R steel in low-week low cycle[J].Journal of Steel Research,2016,37(7):1322-1324.[陈延强,罗云蓉,林海波,等.Q345R钢低周超低周疲劳性能研究[J].钢铁研究学报,2016,37(7):1322-1324.]
[7]Duan Yanhong,Li Youtang,Tian Li,et al.Study on ultra-low cycle fatigue fracture of 4 0 C r under strong torsion conditions[J].Material Heat Treatment Technology,2008,37(22):26-31.[段红燕,李有堂,田利,等.强扭转条件下4 0 C r的超低周疲劳断裂研究[J].材料热处理技术,2008,37(22):26-31.]
[8]Luo Yunrong,Wang Qinyuan,Fu Lei,et al.Low cycle fatigue performance of Q235 steel structure material[J].Joumal of Steel Research,2016,28(12):47-51.[罗云蓉,王清远,付磊,等.Q235钢结构材料的超低周疲劳性能[J].钢铁研究学报,2016,28(12):47-51.]
[9]Wang Shiyue,Lin Mojun,Shao Jianfei.The effect of torsion prestrain on the low cycle fatigue property of 45 steel[J].Mechanical Strength,1998,20(4):300-302.[王时越,林茉君,邵剑飞.扭转预应变对45钢低周疲劳性能的影响[J].机械强度,1998,20(4):300-302.]
[10]Wu Zhiyu,Wang Shiyue,Yang Xijie,et al.Effect of torsion prestrain on low cycle fatigue performance of 35CrMo steel[J].Experimental Mechanics,2013,28(4):511-516.[吴志煜,王时越,杨锡阶,等.扭转预应变对35CrMo钢低周疲劳性能的影响[J].实验力学,2013,28(4):511-516.]
[11]Zheng Jialiang,Sheng Guangmin,Wang Lijuan,et al.Study on high strain and low cycle fatigue performance of HRB500E reinforcement[J].Steel Vanadium and Titanium,2014,35(5):129-135.[郑家良,盛光敏,王丽鹃,等.HRB500E钢筋高应变低周疲劳性能研究[J].钢铁钒钛,2014,35(5):129-135.]
[12]Santner J S.Fine M E.The hysteretic plastic work as a failure criterion in a coffin-manson type relation[J].Scripta Metallurgica,1977(11):159-162.
[13]Wang Yonglian.Mathematical expression of fatigue toughness[J].Journal of Aviation,1995,16(3):110-114.[王永廉.疲劳韧性的数学表达式[J].航空学报,1995,16(3):110-114.]
[14]Sheng Guangmin,Lv Yukun,Huang Zhenhua.Analysis of high strain and low cycle fatigue behavior of seismic reinforcement with fine crystallization and residual heat treatment[J].Functional Materials,2014,45(15):127-131.[盛光敏,吕煜坤,黄振华.细晶化和余热处理抗震钢筋的高应变低周疲劳行为分析[J].功能材料,2014,45(15):127-131.]
[15]Singh V,Pandey V,Kumar S,et al.Effect of ultrasonic shot peening on surface microstructure and fatigue behavior of structural alloys[J].Transactions of the Indian Institute of Metals,2016,69(2):295-301.