齿轮激光冲击强化数值模拟中有限元网格划分的研究  

Investigation on Finite Element Meshes in Numerical Analysis of Gear Laser Shock Processing

作　　者：张兴权[1] 郑如[1] 戚晓利[1] 冯建有[1] 陈六三[1] 何广德 

机构地区：[1]安徽工业大学机械工程学院,马鞍山243002 [2]安徽中鼎密封件股份有限公司,宁国242300

出　　处：《机械科学与技术》2013年第12期1829-1834,共6页Mechanical Science and Technology for Aerospace Engineering

基　　金：国家自然科学基金项目(51175002);安徽省自然科学基金项目(090414156);安徽工业大学研究生创新研究基金项目(2011026)资助

摘　　要：由于渐开线轮齿形状的复杂性,现有网格划分的方法难以适应轮齿激光脉冲冲击强化的模拟过程中网格的划分,本文中提出了一种新的网格划分方法。在分析齿廓特征的基础上,先将轮齿的端面齿廓进行合理分割成不同的规则的区域,再在不同区域内用不同的网格密度生成平面单元,然后通过拖拉方法生成适合激光冲击波传播的体单元,相比于已有的网格划分方法,该方法在网格密度、单元形态、长宽比、单元与激光压力加载方向一致性等方面得到了较好地改善,有效地避免了不合理的网格几何形状,获得较为准确的残余应力。试验结果证明了该方法的正确性,并得出齿面网格尺寸为0.125 mm时最合适求解。Owing to the complicate configuration of cylindrical gear tooth, the present method of mesh gear tooth is difficult to apply to simulate the stress induced by laser shock processing, so a new mesh technique is presented to mesh the gear tooth into the regular three-dimensional finite elements. On the basis of analyzing the tooth profile feature, the end surface of gear tooth is divided firstly into different regions, and then these regions are meshed into the plane elements with different density controlled. Finally, the solid elements can be generated by the drag meth- od, which is suitable for the laser shock waves propagation. Comparing with the known mesh methods, the new technique has clear improvement in grid density, elements form, length-width ration and the same direction of ele- ments, and effectively avoids the abnormal shape of elements, which can ensure calculating successfully and obtain a relatively accurate residual stresses. Moreover, an experiment of gear tooth laser shock processing is performed to validate the mesh method and simulation accuracy＇, and the mesh size 0. 125 mm is selected for further evaluation.

关 键 词：激光脉冲 齿轮 有限元法 网格密度 残余应力 

分 类 号：TN249[电子电信—物理电子学]