表面微观形貌对疲劳强度影响的定量分析
Quantitative Analysis of the Effect of Surface Topography on Fatigue Strength
摘 要
利用原子力显微镜对表面定量测量的结果,通过建立有限元模型,分析了表面微观形貌表征参数对微应力集中的影响,研究了四种不同表面处理方式对1Cr11Ni2W2MoV不锈钢疲劳性能的影响.结果表明:各表征参数包括微缺陷温度、微缺陷的谷底半径和单峰平均间距对微压力集中都有影响,仅靠表面粗糙度参数无法真实反映表面微观形貌对微应力分布的影响;不同表面微观形貌所引起疲劳性能的变化与其表征参数的变化是一致的,利用表面形貌参数可以定量分析不同表面所导致的疲劳性能的改变.
微应力集中
疲劳强度
micro surface topography
micro-stress concentration
fatigue strength
Abstract
Micro surface topographies of four differently machined surfaces of 1Cr11Ni2W2MoV stainless steel were quantitatively characterized by atomic force microscopy,and the effects of different characteristic parameters on micro-stress concentration and different micro topographies on fatigue strength reduction were analyzed using finite element methods.It is found that the characteristic parameters may affect the micro-stress concentration obviously and it is insufficient to use a single surface roughness parameter to represent the effects of surface quality on micro-stress distribution.The difference of the fatigue resistance between different surfaces can be perfectly correlated with the surface characteristic parameters,and it is reasonable to use them to analyze the change of fatigue performance caused by different surface fabrication.
中图分类号 TG115.57
所属栏目
基金项目 国家自然科学基金资助项目(50275073);航空科学基金资助项目(03B52011)
收稿日期 2005/3/11
修改稿日期 2005/5/14
网络出版日期
作者单位点击查看
备注孟波(1976-),男,山东聊城人,博士研究生.
引用该论文: MENG Bo,GUO Wan-lin. Quantitative Analysis of the Effect of Surface Topography on Fatigue Strength[J]. Materials for mechancial engineering, 2006, 30(5): 26～29
孟波,郭万林. 表面微观形貌对疲劳强度影响的定量分析[J]. 机械工程材料, 2006, 30(5): 26～29
被引情况:
【1】胡家杰,钟雯,刘启跃, "PD3和U71Mn钢轨钢的弯-弯疲劳裂纹扩展特性",机械工程材料 34, 58-61(2010)
【2】孟波,郭万林,姜燕, "表面形貌对1Cr11Ni2W2MoV不锈钢耐腐蚀性能的影响",机械工程材料 32, 8-11(2008)
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参考文献
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【11】姚卫星.结构疲劳寿命分析[M].北京:国防工业出版社,2003.7-8.
【2】Gao Y X,Yi J Z,Lee P D,et al.A micro-cell model of the effect of microstructure and defects on fatigue resistance in cast aluminum alloys[J].Acta Mater,2004,52:5435-5449.
【3】Bayomi M R,Abdellatif A K.Effect of surface finish on fatigue strength[J].Engng Fracture Mech,1995,51(5):861-870.
【4】Itoga H,Tokaji K.Effect of surface roughness on step-wise S-N characteristics in high strength steel[J].Int J Fatigue,2003,25:379-385.
【5】刘白,汪大鹏,廖 珍.机械加工对弯曲疲劳强度的影响[J].机械工程材料,2002,26(1):22-24.
【6】Novovic D,Dewes R C.The effect of machined topography and integrity on fatigue life[J].Int J Mach Tools Manuf,2004,44:125-134.
【7】The technical staff of the Machinability Data Center.Machining Data Handbook[M].Cincinnati,Ohio:Machinability Data Center,1980.18-9.
【8】Arola D.An examination of the effects from surface texture on the strength of fiber reinforced plastics[J].J Compos Mater,1999,33:103-123.
【9】Bhushan B,Agrawal G B.Finite element analysis of nanostructures with roughness and scratches[J].Ultramicroscopy,2003,97:495-507.
【10】Arola D,Williams C L.Estimating the fatigue stress concentration factor of machined surfaces[J].Int J Fatigue,2002,24:923-930.
【11】姚卫星.结构疲劳寿命分析[M].北京:国防工业出版社,2003.7-8.
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