Investigation on Finite Element Meshes in Numerical Analysis of Gear Laser Shock Processing
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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。Abstract: 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 method,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 elements,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.
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Key words:
- calculations /
- computer simulation /
- efficiency /
- finite element method /
- gear teeth
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[1] Guagliano M,Riva E,Guidetti M. Contact fatigue failure analysis of shot-pcened gears[J].ENGINEERING FAILURE ANALYSIS,2002,(09):147-158. [2] 张兴权,何广德,戚晓利. 激光冲击强化对齿轮接触疲劳的影响[J].中国激光,2007,(12):3187-3191. [3] Gulshan S,Ramana V G,David S S. MedeIing and parameter design of a laser shock peening process[J].Intemational Journal for Computational Methods in Engineering Science and Mechanice,2011,(05):233-253. [4] 顾守丰,连小珉,丁能根. 斜齿轮弯曲强度三维有限元分析模型的建立及其程序实现[J].机械科学与技术,1996,(02):167-171. [5] 顾守丰,连小珉,颜磊. 斜齿轮轮齿三维有限元网格自动生成及细化[J].清华大学学报(自然科学版),1996,(08):37-82. [6] 刘更,沈允文. 内、外啮合斜齿轮三维有限元网格自动生成原理及其程序实现[J].机械工程学报,1992,(05):20-25. [7] 丁能根. 斜齿轮三维有限元网格和接触单元的自动生成[J].合肥工业大学学报,2003,(05):1094-1097 [8] Zouari S,Maatar M,Fakhfakh T. Three-dimensional analyses by finite element method of a spur gear:effect of cracks in the teeth foot on the mesh stiffness[J].Journal of Failure Analysis and Prevention,2007,(06):475-481. [9] 张兴权,何广德,汪世益. 激光喷丸强化对调质40Cr钢组织及耐磨性的影响[J].材料热处理学报,2011,(05):138-142. [10] Graham H,Lloyd A H,Fritz H. Surface prestressing to improve fatigue strength of component by laser shot peening[J].Optics and Laser in Engineering,2000.327-337. [11] Ding K,Ye L. Three-dimensional dynamic finite element analysis of multiple laser shock peening processes[J].SURFACE ENGINEERING,2003,(05):351-358. [12] Benzley S E,Penye,Merkleyk. A comparison of all-hexahedral and all-tetrshedral finite element meshes for elastic and elasto-plastic analysis[A].Albuquerque:New Mexico,Sandia National Laboratories,1995.179-191. [13] 胡永祥,姚振强. 激光冲击强化有限元仿真时间步长选择方法[J].上海交通大学学报,2006,(10):1743-1747. [14] Peyre P,Fabbro R,Merrien P. Laser shock proeeesing of aluminum alloys,Application to high cycle fatigue behaviour[J].Material Science and Engineering,1996.102-113. [15] Ocana J L,Morales M,Molpeceres C. Numerical simulation of surface deformation and residual stresses fields in laser shock processing experiments[J].Applied Surface Science,2004.242-248.
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