边缘效应对凹坑织构接触应力的影响
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摘要
边缘效应是引起织构表面应力集中现象的主要因素之一,织构的摩擦学性能与受载时织构边缘的最大应力密切相关。本文通过有限元分析了凹坑织构在初始和稳定摩擦阶段的静态接触应力分布,研究了在不同摩擦状态下边缘效应对织构表面接触应力的影响。为降低织构的边缘效应因素,同时计算了具有圆弧过渡边缘织构表面的应力分布。计算结果表明,织构最大接触应力趋势与摩擦系数的变化呈正相关,边缘圆弧过渡可显著降低织构的最大应力。
Edge effect is one of the main factors causing stress concentration on texture surface. Tribological properties of texture are closely related to the maximum stress on texture edge under load. The contact stress distribution of dimple textures and the influence of edge effect were analyzed by FEM under different friction conditions in initial and stable friction stage. The stress distribution on the edge-profiled dimple textures were simulated. And the results show that the trend of maximum contact stress of texture is positively correlated with the change of friction coefficient,and edge-profiled dimple textures can significantly reduce the maximum stress of texture.
Edge effect is one of the main factors causing stress concentration on texture surface. Tribological properties of texture are closely related to the maximum stress on texture edge under load. The contact stress distribution of dimple textures and the influence of edge effect were analyzed by FEM under different friction conditions in initial and stable friction stage. The stress distribution on the edge-profiled dimple textures were simulated. And the results show that the trend of maximum contact stress of texture is positively correlated with the change of friction coefficient,and edge-profiled dimple textures can significantly reduce the maximum stress of texture.
引文
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[2]LU H,REN S,GUO J,et al. Laser textured Co-Cr-Mo alloy stored chitosan/poly(ethylene glycol)composite applied on artificial joints lubrication[J]. Materials Science&Engineering C Materials for Biological Applications,2017,78:239.
[3]MERLO A M. The contribution of surface engineering to the product performance in the automotive industry[J]. Surface and coatings Technology,2003,174~175:21~26.
[4]Grabon W,Koszela W,Pawlus P,et al. Improving tribological behaviour of piston ring–cylinder liner frictional pair by liner surface texturing[J]. Tribology International,2013,61(61):102~108.
[5]Shinkarenko A,Kligerman Y,Etsion I. The effect of surface texturing in soft elasto-hydrodynamic lubrication[J]. Tribology International,2009,42(2):284~292.
[6]Ma C B,Zhu H,Li J Q. Experimental study of tribological properties of texture on different surfaces of frictional pairs[J]. Journal of China University of Mining&Technology,2010,39(2):244~248.
[7]Charitopoulos A G,Efstathiou E E,Papadopoulos C I,et al. Effects of manufacturing errors on tribological characteristics of 3-D textured micro-thrust bearings[J]. Cirp Journal of Manufacturing Science&Technology,2013,6(2):128~142.
[8]RASHID H S J,PLACE C S,MBA D,et al. Reliability model for helicopter main gearbox lubrication system using influence diagrams[J]. Reliability Engineering&System Safety,2015,139:50~57.
[9]ETSION I. Improving Tribological Performance of Mechanical Components by Laser Surface Texturing[J]. Tribology Letters,2004,17(4):733~737.
[10]BHADURI D,BATAL A,DIMOV S S,et al. On Design and Tribological Behaviour of Laser Textured Surfaces☆[J]. Procedia Cirp,2017,60:20~25.
[11]Kovalchenko A,Ajayi O,Erdemir A,et al. Friction and wear behavior of laser textured surface under lubricated initial point contact[J]. Wear,2011,271(9):1719~1725.
[12]Oshkour A A,Osman N A A,Bayat M,et al. Three-dimensional finite element analyses of functionally graded femoral prostheses with different geometrical configurations[J]. Materials&Design,2014,56:998~1008.
[13]Wang X,Yamaguchi A. Characteristics of hydrostatic bearing/seal parts for water hydraulic pumps and motors. Part 1:Experiment and theory[J]. Tribology International,2002,35(7):425~433.