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首页> 外文期刊>International journal of engineering research and industrial applications >CONTACT FATIGUE ESTIMATION AND MATERIAL OPTIMISATION FOR WEAR OF CAM SHAFT FOR HIGH PRESSURE DIESEL PUMPS
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CONTACT FATIGUE ESTIMATION AND MATERIAL OPTIMISATION FOR WEAR OF CAM SHAFT FOR HIGH PRESSURE DIESEL PUMPS

机译：高压柴油机凸轮轴磨损的接触疲劳估计和材料优化

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摘要

Stress and deformation plays very important role in structure/machine design. Proper stress design prevents failure of structures and increases the life of the system. Due to the advances in computer based Finite element techniques, problems can be easily analyzed and designs can be changed to the requirements within short time. In this present work a cam-shaft assembly components are analyzed for stress and deformation conditions. Cam shaft is modeled and hex meshed for better accuracy using Hyper mesh. The meshed objects are imported and analyzed for structural safety conditions. Initially plunger loads are calculated for the given design specifications. Then the reaction loads are calculated which will act on the bearings through the cam shaft. Cam shaft is analyzed for the fatigue life due to the follower (plunger) loads. Ansys fatigue module is used for life estimation of the cam shaft under contact conditions. SN curve data is supplied as input and loads are applied on the cam lobes in six load steps. Each load step file is saved and the results are captured for individual load steps. The cumulative usage factor shows very near value of fatigue life suggesting a better material requirement for longer life. Contact pressure estimations are also carried out. This results shows a higher stress development indicating the requirement for high yield and tensile strength material to prevent wear out of the cam.
机译：应力和变形在结构/机器设计中起着非常重要的作用。适当的应力设计可防止结构故障并延长系统寿命。由于基于计算机的有限元技术的进步，可以轻松分析问题，并可以在短时间内将设计更改为要求。在本工作中，分析了凸轮轴组件的应力和变形条件。使用Hyper网格对凸轮轴进行建模并进行六角网格划分，以实现更高的精度。导入网格物体并进行结构安全条件分析。最初针对给定的设计规格计算柱塞载荷。然后计算反作用力，该反作用力将通过凸轮轴作用在轴承上。分析了凸轮轴的从动（柱塞）载荷引起的疲劳寿命。 Ansys疲劳模块用于在接触条件下估算凸轮轴的寿命。提供SN曲线数据作为输入，并以六个载荷步长将载荷施加到凸轮凸角上。保存每个加载步骤文件，并捕获各个加载步骤的结果。累积使用系数显示出非常接近的疲劳寿命值，表明更长的使用寿命需要更好的材料要求。还可以进行接触压力估算。该结果显示出较高的应力发展，表明需要高屈服和抗张强度的材料来防止凸轮磨损。

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