引伸计刀口对低周疲劳数据影响的试验研究
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摘要
采用轴向应变控制方法,结合4种试验方案,在MTS809拉扭复合疲劳试验机上对18根试件进行拉压低周疲劳试验,对比研究引伸计刀口对低周疲劳失效位置、循环应力响应特征曲线、塑性应变能密度的影响以及消除引伸计刀口影响的最佳方案。结果表明:引伸计刀口对低周疲劳数据的有效性的确存在较大的影响,对试件存在一定的损伤。在试件与刀口接触处贴上透明胶是一种避免引伸计刀口损伤,提高试件有效利用率,并节约资源的有效办法。
With four different methods,a total of 18 low cycle fatigue(LCF) experiments under uniaxial strain control were carried out on a MTS 809 servo-hydraulic material testing machine.The sites of LCF fatigue failure of specimens,the cyclic stress response characteristics and the plastic strain energy density were investigated.The knife edges had considerable effects on the results of the LCF and injury to the specimens.By comparing all the experimental results,an effective method has been proposed to avoid the injury to the knife edges.Using this method,the availability of specimens could be enhanced and the resource could be saved.
With four different methods,a total of 18 low cycle fatigue(LCF) experiments under uniaxial strain control were carried out on a MTS 809 servo-hydraulic material testing machine.The sites of LCF fatigue failure of specimens,the cyclic stress response characteristics and the plastic strain energy density were investigated.The knife edges had considerable effects on the results of the LCF and injury to the specimens.By comparing all the experimental results,an effective method has been proposed to avoid the injury to the knife edges.Using this method,the availability of specimens could be enhanced and the resource could be saved.
引文
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[2]赵蕴林.5.12大地震后砖混结构房屋抗震加固技术探讨[J].四川理工学院学报:自然科学版,2011,24(2):129-132.Zhao Yunlin.Analysis of the anti-earthquake consolida-ting technology to brick structure buildings after the earthquake on5.12,2008[J].J Sichuan Univ Sci Eng:Nat Sci Ed,2011,24(2):129-132.(in Chinese).
[3]龚士弘,盛光敏.对“钢筋混凝土结构构件抗震设计”材料部分的意见[J].工程建设标准化,1996(1):6-9.Gong Shihong,Sheng Guangming.The views on mate-rials in"reinforced concrete structure in anti-seismic de-sign"[J].Standard Eng Construct,1996(1):6-9.(in Chinese)
[4]蒲玉梅,吴林,吴结才.Q235B、Q345BH型钢综合抗震性能试验研究[J].安徽冶金,2005(4):1-5.Pu Yumei,Wu Lin,Wu Jiecai.The overall anti-seismic properties of Q235Band Q345BH H-beams[J].AnhuiMetal,2005(4):1-5.(in Chinese)
[5]赵蕴林.普通民用建筑基础隔震技术研究[J].四川理工学院学报:自然科学版,2011,24(3):249-252.Zhao Yunlin.Primary research of base-isolation tech-nology of ordinary civilian buildings[J].J Sichuan Univ Sci Eng:Nat Sci Ed,2011,24(3):249-252.(in Chi-nese).
[6]龚士弘,盛光敏.地震区建筑用钢的韧性对建筑物抗震性能的影响[J].工程抗震,2004(3):41-47.Gong Shihong,Sheng Guangming.Effects of toughness of steel on seismic performance of building structures[J].Earthq Resist Eng,2004(3):41-47.(in Chinese)
[7]Luo Y R,Wang Q R,Yang B.Low cycle fatigue tests on low carbon steel[C]//Proceedings2011Interna-tional Conference on Business Management and Elec-tronic Information.Guangzhou,2011,4:741-746.
[8]Luo Y R,Guo Y,Wang Q Y,et al.Low cycle fatiguebehavior of high-strength structural steel under biased strain control[J].Appl Mech Mater,2011,71-78:4020-4025.
[9]罗云蓉,王清远,刘永杰,等.Q235、Q345钢结构材料的低周疲劳性能研究[J].四川大学学报:工程科学版,2012,44(2):169-176.Luo Yunrong,Wang Qingyuan,Liu Yongjie,et al.Low cycle fatigue properties of steel structure materials Q235and Q345[J].J Sichuan Univ:Eng Sci Ed,2012,44(2):169-176.(in Chinese)
[10]Grenier D,Das S,Hamdoon M.Effect of fatigue strain range on properties of high-strength structural steel[J].Marine Structure,2010,23(1):88-102.
[11]于强.循环蠕变加载下疲劳裂纹扩展速率的探讨[J].四川理工学院学报:自然科学版,2012,25(2):22-27.Yu Qiang.Research on the fatigue crack growth rateunder cyclic creep loading[J].J Sichuan Univ Sci Eng:Nat Sci Ed,2012,25(2):22-27.(in Chinese).
[12]于强.多轴比例加载下疲劳短裂纹扩展速度的探讨[J].四川理工学院学报:自然科学版,2011,24(5):526-529.Yu Qiang.Research on the short fatigue crack growth rate under the proportioned multi-axial loading[J].J Sichuan Univ Sci Eng:Nat Sci Ed,2011,24(5):526-529.(in Chinese).
[13]Luo Y R,Huang C X,Guo Y,et al.Energy-basedprediction of low cycle fatigue life of high-strength structural steel[J].J Iron Steel Res Int,2012,19(10):47-53.
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