7075铝合金扭转微动疲劳行为研究
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摘要
在基于多轴疲劳试验机上自主设计的扭转微动疲劳装置上,对7075铝合金材料进行了扭转微动疲劳试验,讨论了相同法向载荷下不同扭转切应力对扭转微动疲劳寿命的影响,建立了7075铝合金扭转微动疲劳S-N曲线,并采用SEM,EDS,EPMA等分析方法对扭转微动疲劳的损伤区域进行了分析,建立了扭转微动疲劳混合区接触表面损伤和裂纹萌生及扩展的物理模型,揭示了7075铝合金扭转微动疲劳的损伤机理.试验结果表明:微动作用导致疲劳寿命大大降低;扭转微动疲劳S-N曲线呈"ε"型曲线特征;损伤区靠加载端位置氧化严重,氧化程度随着循环次数增加而增加;微动疲劳的裂纹萌生于次表面,接触区中心两侧主裂纹扩展交叉后垂直于接触表面扩展至试样断裂.
The torsional fretting test of 7075 aluminum alloy was carried out on the independently designed fretting fatigue test rig based on the multi-axis fatigue testing machine.The effects of different torsional shear stress on fretting fatigue life under the same normal load were discussed and S-N curve for the torsional fretting fatigue of 7075 aluminum alloy was obtained.The damage regions of torsional fretting fatigue were analyzed based on scanning electron microscopy,energy dispersive spectroscopy and electron probe micro-analyzer.The damage physical model of the surface damages,the crack initiation and propagation in mixed fretting regime was set up to reveal the damage mechanism of torsional fretting fatigue.The experimental results show that the fatigue life was greatly reduced for the effect of the fretting;the S-N curve of the torsional fretting fatigue presented the characteristics of"ε"curve.The oxidation of the damage regions near the loading end was the most serious and the oxidation degree of the contact area increased with the number of cycles increasing.The torsional fretting fatigue cracks initiated in the subsurface and the main cracks on both sides of the contact central area propagated,crossed and then continued propagating perpendicularly to the contact surface until the test sample was fractured.
The torsional fretting test of 7075 aluminum alloy was carried out on the independently designed fretting fatigue test rig based on the multi-axis fatigue testing machine.The effects of different torsional shear stress on fretting fatigue life under the same normal load were discussed and S-N curve for the torsional fretting fatigue of 7075 aluminum alloy was obtained.The damage regions of torsional fretting fatigue were analyzed based on scanning electron microscopy,energy dispersive spectroscopy and electron probe micro-analyzer.The damage physical model of the surface damages,the crack initiation and propagation in mixed fretting regime was set up to reveal the damage mechanism of torsional fretting fatigue.The experimental results show that the fatigue life was greatly reduced for the effect of the fretting;the S-N curve of the torsional fretting fatigue presented the characteristics of"ε"curve.The oxidation of the damage regions near the loading end was the most serious and the oxidation degree of the contact area increased with the number of cycles increasing.The torsional fretting fatigue cracks initiated in the subsurface and the main cracks on both sides of the contact central area propagated,crossed and then continued propagating perpendicularly to the contact surface until the test sample was fractured.
引文
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[11]Peng Jinfang.Experimental study of several metal materials on bending fretting fatigue[D].Chengdu:Southwest Jiaotong University,2012(in Chinese)[彭金方.几种金属材料弯曲微动疲劳试验研究[D].成都:西南交通大学,2012.].
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[13]Shen Yantuan.Study on bending fretting fatigue characteristics of18Cr Ni Mo7-6 alloy steel[D].Chengdu:Southwest JiaotongUniversity,2015(in Chinese)[申颜团.18Cr Ni Mo7-6合金钢的弯曲微动疲劳特性研究[D].成都:西南交通大学,2015].
[14]Lee H,Mall S.Investigation into effects and interaction of various fretting fatigue variables under slip-controlled mode[J].Tribology International,2006,39(10):1213-1219.doi:10.1016/j.triboint.2006.02.011.
[15]Zhou Z R,Fayeulle S,Vincent L.Cracking behaviour of various aluminium alloys during fretting wear[J].Wear,1992,155(2):317-330.doi:10.1016/0043-1648(92)90091-L.
[16]Hu Zhizhong,Wu Yusheng.Mechanism map of torsional fatigue fracture[J].Acta Metallurgica Sinica,1990(5):51-56(in Chinese)[胡志忠,吴玉声.扭转疲劳断裂机制图[J].金属学报,1990(5):51-56].
[17]Glaeser W A,Shaffer S J.Contact fatigue[J].ASM Handbook,1996(19):331-336.
[18]Jiang Chunsong,Peng Jinfang,Shen Mingxue,et al.Finite element simulation of bending fretting and fatigue life prediction for 316Lstainless steel component[J].Materials for Mechanical Engineering,2013(8):81-84,97(in Chinese)[蒋春松,彭金方,沈明学,等.316L不锈钢构件弯曲微动的有限元模拟及其疲劳寿命预测[J].机械工程材料,2013(8):81-84,97].
[19]Song Chuan.Damage analysis and experimental simulation of rotatory bending fretting fatigue of components[D].Chengdu:Southwest Jiaotong University,2015(in Chinese)[宋川.轴类部件旋转弯曲微动疲劳损伤分析及试验模拟[D].成都:西南交通大学,2013].
[2]Nowell D,Dini D,Hills D A.Recent developments in the understanding of fretting fatigue[J].Engineering Fracture Mechanics,2006,73(2):207-222.doi:10.1016/j.engfracmech.2005.01.013.
[3]Zhou Zhongrong,Vincent L.Fretting wear[M].Beijing:Science Press,2002:124-140(in Chinese)[周仲荣,Leo Vincent.微动磨损[M].北京:科学出版社,2002:124-140].
[4]He Mingjian.Fretting fatigue of mechanical components[M].Beijing:National Defend Industry Press,1994:32-42(in Chinese)[何明鉴,机械构件的微动疲劳[M].北京:国防工业出版社,1994:32-42].
[5]Zhou Zhongrong,Zhu Minghao.Dual-fretting wear[M].Shanghai:Shanghai Jiaotong University Press,2004:2-28(in Chinese)[周仲荣,朱旻昊.复合微动磨损[M].上海:上海交通大学出版社,2004:2-28].
[6]Shen Mingxue,Peng Jinfang,Zheng Jianfeng,et al.Study and development of fretting fatigue[J].Journal of Materials Engineering,2010,24(12):86-91(in Chinese)[沈明学,彭金方,郑健峰,等.微动疲劳研究进展[J].材料工程,2010,24(12):86-91].doi:10.3969/j.issn.1001-4381.2010.12.019.
[7]Peng J F,Song C,Shen M X,et al.An experimental study on bending fretting fatigue characteristics of 316L austenitic stainless steel[J].Tribology International,2011,44(11):1417-1426.doi:10.1016/j.triboint.2010.11.013.
[8]Peng J F,Liu J H,Cai Z B,et al.Study on bending fretting fatigue damages of 7075 aluminum alloy[J].Tribology International,2013,59:38-46.doi:10.1016/j.triboint.2012.06.016.
[9]Peng J F,Zhu M H,Cai Z B,et al.On the damage mechanisms of bending fretting fatigue[J].Tribology International,2014,76(76):133-141.
[10]Shen L,Tang Y,Jiang B.Failure analysis of the conical press-fit connections in a locomotive drive system[J].Engineering Failure Analysis,2014,44(9):158-167.
[11]Peng Jinfang.Experimental study of several metal materials on bending fretting fatigue[D].Chengdu:Southwest Jiaotong University,2012(in Chinese)[彭金方.几种金属材料弯曲微动疲劳试验研究[D].成都:西南交通大学,2012.].
[12]Shen Mingxue,Zhou Yan,Yang Sha,et al.Effect on contact load on dual-rotary fretting tribological behavior of 7075 aluminum alloy[J].The Chinese Journal Nonferrous Metals,2012,22(12):3327-3333(in Chinese)[沈明学,周琰,杨莎,等.接触载荷对7075铝合金扭转复合微动摩擦学行为的影响[J].有色金属学报,2012,22(12):3327-3333].
[13]Shen Yantuan.Study on bending fretting fatigue characteristics of18Cr Ni Mo7-6 alloy steel[D].Chengdu:Southwest JiaotongUniversity,2015(in Chinese)[申颜团.18Cr Ni Mo7-6合金钢的弯曲微动疲劳特性研究[D].成都:西南交通大学,2015].
[14]Lee H,Mall S.Investigation into effects and interaction of various fretting fatigue variables under slip-controlled mode[J].Tribology International,2006,39(10):1213-1219.doi:10.1016/j.triboint.2006.02.011.
[15]Zhou Z R,Fayeulle S,Vincent L.Cracking behaviour of various aluminium alloys during fretting wear[J].Wear,1992,155(2):317-330.doi:10.1016/0043-1648(92)90091-L.
[16]Hu Zhizhong,Wu Yusheng.Mechanism map of torsional fatigue fracture[J].Acta Metallurgica Sinica,1990(5):51-56(in Chinese)[胡志忠,吴玉声.扭转疲劳断裂机制图[J].金属学报,1990(5):51-56].
[17]Glaeser W A,Shaffer S J.Contact fatigue[J].ASM Handbook,1996(19):331-336.
[18]Jiang Chunsong,Peng Jinfang,Shen Mingxue,et al.Finite element simulation of bending fretting and fatigue life prediction for 316Lstainless steel component[J].Materials for Mechanical Engineering,2013(8):81-84,97(in Chinese)[蒋春松,彭金方,沈明学,等.316L不锈钢构件弯曲微动的有限元模拟及其疲劳寿命预测[J].机械工程材料,2013(8):81-84,97].
[19]Song Chuan.Damage analysis and experimental simulation of rotatory bending fretting fatigue of components[D].Chengdu:Southwest Jiaotong University,2015(in Chinese)[宋川.轴类部件旋转弯曲微动疲劳损伤分析及试验模拟[D].成都:西南交通大学,2013].