Microgeometrical influences on micropitting fatigue damage: multi-scale analysis
Microgeometrical influences on micropitting fatigue damage: multi-scale analysis
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DOI：
10.1177/1350650110396980
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发表时间：
2011-06
期刊：
影响因子：
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通讯作者：
A. Fabre;L. Barrallier;M. Desvignes;H. P. Evans;M. P. Alanou
中科院分区：
文献类型：
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作者：
A. Fabre;L. Barrallier;M. Desvignes;H. P. Evans;M. P. Alanou
工程师需要有效的预测方法来设计在疲劳条件下使用的零件。在齿轮中，表面疲劳损伤在两个尺度上观察到：点蚀和微点蚀。这两种现象是由于齿间接触区局部载荷的变化而产生的。载荷受齿形和齿面粗糙度的影响，从而产生应力源。需要确定决定疲劳寿命的相关几何参数，在这种情况下，仍然需要改进知识。在目前的研究中，七个参数被用来定义一个通用的牙齿粗糙度轮廓。用弹流力学程序计算了粗齿与光滑齿滚动/滑动接触时的瞬态力学载荷。采用积分法确定应力时程，利用Crossland疲劳准则预测点蚀和微点蚀。将分析结果应用于32CrMoV13调质钢的一般粗糙度参数的50种变化。结果表明，微点蚀（在最大赫兹剪切应力处）受4个参数的影响，微点蚀发生区域的von Mises等效应力超过材料屈服应力的程度受2个参数的影响，疲劳寿命受3个参数的影响。
Effective prediction methods are needed by engineers to design parts used in fatigue conditions. In gears, surface fatigue damage is observed at two scales: pitting and micropitting. These two phenomena occur in response to the variation of the local loading on the contact zone between teeth. The loading is influenced by the shape of the teeth and their surface roughness, which induces stress raisers. The pertinent geometrical parameters that determine fatigue lifetime need to be identified, and in this situation improved knowledge is still required. In the current study, seven parameters are used to define a generic tooth roughness profile. The transient mechanical loading acting on this rough tooth in rolling/sliding contact with a smooth tooth is obtained using elastohydrodynamic code. The stress time history is determined by integration so that pitting and micropitting can be predicted using the Crossland fatigue criterion. The ana- lyses were applied to results obtained for 32CrMoV13 quenched and tempered steel for about 50 variations of the generic roughness profile parameters. It was found that pitting (at the position of the maximum Hertzian shear stress) is influenced by four of the parameters, the extent to which the von Mises equivalent stress exceeds the material yield stress in the zone where micropitting occurs is influenced by two parameters, and the fatigue lifetime is influenced by three parameters.