Study on rolling contact fatigue under micro-elastohydrodynamic lubrication from a standpoint of fracture mechanics

从断裂力学角度研究微弹流润滑下的滚动接触疲劳

基本信息

  • 批准号:
    07455076
  • 负责人:
  • 金额:
    $ 1.28万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
  • 财政年份:
    1995
  • 资助国家:
    日本
  • 起止时间:
    1995 至 1996
  • 项目状态:
    已结题

项目摘要

In lubricated rolling-sliding contact of rough surfaces, a method of elastohydrodynamic analysis was developed. In the case of transverse roughness where the surface texture is perpendicular to rolling-sliding contact direction, transient Reynolds equation and elastic equation were simultaneously solved providing the geometry was simusoidal or trapezoidal. In the case of longitudinal roughness where the direction of surface texture is same with rolling-sliding direction, three dimensional elastohydrodynamic analysis was conducted while periodic boundary condition was assumed. When the surface roughness became large, the converged solution could not be obtained. However, the converged solution in smaller roughness approached to direct elastic contact condition as increasing in roughness, therefore the unconverged case could be approximated by elastic contact solution.Combining a contact stress analysis of rough surfaces and a stress intensity factor analysis, the influence of asperity c … More ontact conditions upon rolling contact fatigue was investigated theoretically. Traverse and longitudinal roughness models were used for the calculation. Different asperity contact conditions during several passages of crack through loading zone had a significant effect on the stress intensity factor range of shear mode, especially on the surface of lower velocity. On the surface of higher velocity, an asperity contact produced a protuberance of the upper layr of crack (i.e., a rising shear mode) at the entrance side of loading zone and then the same asperity was supposed to tear off the upper layr of crack. This effect would promote abrasive wear by asperity. On the surface of lower velocity, a large depression of the upper layr (i.e., a sinking shear mode) and a rising shear mode had to be caused by different asperity crack positioning. By these different asperity contact conditions during several passages, reversed stress intensity factors were produced.Experimental study on pitting of gear materials has been conducted using two-roller machine. The surfaces of test rollers were recorded in Video Tape at every adequate loading cycles and evident pitting cracks observed after a long running were followed from an early stage of running by reversing the time. This technique makes the observation of initiation and propagation of cracks possible. The behaviors of surface cracks were investigated using rollers with three different roughness orientations at higher hardness side : circumferentially ground roller, axially ground roller and obliguely ground roller. Pitting cracks were most easily caused at oblique roughness compared with at circumferential roughness or at axial one. Less
提出了粗糙表面润滑滚动滑动接触的弹流动力学分析方法。在表面织构垂直于滚滑接触方向的横向粗糙度情况下,同时求解了几何形状为正弦波或梯形的瞬态雷诺方程和弹性方程。在表面织构方向与滚动滑动方向相同的纵向粗糙度情况下,假设周期边界条件,进行三维弹流动力学分析。当表面粗糙度变大时,不能得到收敛解。而较小粗糙度下的收敛解随着粗糙度的增大而接近于直接弹性接触条件,因此不收敛情况可以用弹性接触解近似。结合粗糙表面的接触应力分析和应力强度因子分析,从理论上研究了粗糙度、粗糙度等接触条件对滚动接触疲劳的影响。横向和纵向粗糙度模型用于计算。裂纹通过加载区的若干通道中不同的粗糙接触条件对剪切模式的应力强度因子范围有显著影响,特别是在低速表面。在速度较高的表面上,在加载区入口侧,一个粗糙接触会产生上部裂纹的凸起(即上升剪切模式),然后假定同样的粗糙接触会撕裂上部裂纹。这种效应会促进磨料因粗糙度而磨损。在低速面上,不同的粗糙裂纹定位会导致上层的大凹陷(即下沉剪切模式)和上升剪切模式。在不同的通道接触条件下,产生了相反的应力强度因子。利用双辊机对齿轮材料的点蚀进行了实验研究。在每个适当的加载周期内,将测试辊的表面记录在录像带中,从运行初期开始,通过倒转时间跟踪长时间运行后观察到的明显的点蚀裂纹。这种技术使观察裂纹的起裂和扩展成为可能。采用高硬度侧三种不同粗糙度取向的滚轮:周向磨削滚轮、轴向磨削滚轮和斜向磨削滚轮,研究了表面裂纹的行为。与周向粗糙度和轴向粗糙度相比,斜向粗糙度最容易产生点蚀裂纹。少

项目成果

期刊论文数量(25)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
市丸 和徳: "転がり疲れに関する実験的研究(第2報)" 日本トライボロジー学会トライボロジー会議予稿集. '96春,東京. 489-491 (1996)
Kazunori Ichimaru:“滚动疲劳实验研究(第二次报告)”日本摩擦学会摩擦学会议记录,96 年春季,东京 489-491(1996 年)。
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    0
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市丸和徳: "転がり疲れの発生機構(ピッチングの特徴の破壊力学的説明)" 日本機械学会第73期全国大会講演論文集. IV. 128-129 (1995)
Kazunori Ichimaru:“滚动疲劳产生机制(俯仰特性的断裂力学解释)”日本机械工程学会第73届全国会议论文集IV 128-129。
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    0
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市丸 和徳: "転がり疲れに及ぼす粗さ筋目方向の影響" 日本トライボロジー学会トライボロジー会議予稿集. '96秋 北九州. 4-6 (1996)
Kazunori Ichimaru:“粗糙度和晶粒方向对滚动疲劳的影响”日本摩擦学会摩擦学会议记录,秋季 96 北九州。
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    0
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市丸和徳: "接触面解析による転がり疲れ現象の解明" 日本機械学会第73期全国大会資料集. VI. 34-35 (1995)
Kazunori Ichimaru:“通过接触表面分析阐明滚动疲劳现象”第 73 届日本机械工程师学会全国会议材料 VI 34-35。
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  • 影响因子:
    0
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市丸 和徳: "転がり疲れき裂とフレッチング疲れき裂の比較観察" トライボロジー会議予稿集 東京 1996-5. (1996)
Kazunori Ichimaru:“滚动疲劳裂纹和微动疲劳裂纹的比较观察”摩擦学会议论文集东京 1996-5(1996)。
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    0
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ICHIMARU Kazunori其他文献

ICHIMARU Kazunori的其他文献

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{{ truncateString('ICHIMARU Kazunori', 18)}}的其他基金

Study on mechanical environments and tribo-failures at the operating surfaces of mechanical elements
机械元件工作表面的机械环境和摩擦失效研究
  • 批准号:
    09450071
  • 财政年份:
    1997
  • 资助金额:
    $ 1.28万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
STUDY ON MECHANISM OF MICROSCOPIC FAILURE OF ROUGH SURFACE UNDER REPETITIVE CONTACT STRESS
重复接触应力下粗糙表面微观失效机理研究
  • 批准号:
    02452113
  • 财政年份:
    1990
  • 资助金额:
    $ 1.28万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (B)
Study on Oil Film formation of Rough Surfaces in Rolling Contact under Variable Load
变载荷下滚动接触粗糙表面油膜形成研究
  • 批准号:
    62460089
  • 财政年份:
    1987
  • 资助金额:
    $ 1.28万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (B)
Co-Operative Research on Fatigue Failure at Contact Surface
接触面疲劳失效的协同研究
  • 批准号:
    60302043
  • 财政年份:
    1985
  • 资助金额:
    $ 1.28万
  • 项目类别:
    Grant-in-Aid for Co-operative Research (A)

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