全文下载：2012040405
张明， 刘小强， 焦桔萍， 张卫锋， 韩荣娟
（青岛科技大学 机电工程学院，山东 青岛 266061）
摘要: 采用ANSYS有限元分析软件，通过建立合适的有限元模型，在温度场分析的基础上，模拟出气体介质中电火花表面强化的应力场情况，并对应力场产生的原因及应力在工件内部的分布及其变化情况进行了分析。结果表明：在电火花表面强化过程中，电火花放电产生的非均匀瞬态温度场导致了热应力；强化区域的局部熔化及热膨胀受到周围较冷区域的束缚，在工件内部产生了压缩应力，冷却后，伴随着强化区域的收缩，原来的压应力逐渐转化为拉应力；热量在不同方向上的传播速度不同，这也导致了不同方向上的热应力不同。
关键词: ANSYS； 有限元； 电火花强化； 应力
中图分类号: TG 156.99文献标志码： A
Analysis on the Stress Field of Electrical Discharge Surface Strengthening in Gas Medium
ZHANG Ming, LIU Xiao-qiang, JIAO Ju-ping, ZHANG Wei-feng, HAN Rong-juan
(College of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao 266061, China )
Abstract: A suitable Finite Element model is built by the ANSYS software and the stress field of electrical discharge surface strengthening in gas medium is simulated on the basis of temperature field analysis. Then the cause, distribution and change of stress field in the workpiece also is analyzed. The results show that non-uniform transient temperature field generated by electrospark discharge leads to heat stress in the process of electrospark surface strengthening. Because the local melt and thermal expansion in strengthening region is shackled by surrounding cooler regions, compressive stress is generated in the workpiece. The original compressive stress gradually becomes tensile stress along with the strengthening region shrinks after it cools. The heat has different propagation velocity in different directions, which leads to different thermal stress in the different directions.
Key words: ANSYS; Finite Element; electrical discharge strengthening; stress
收稿日期：2011-12-14
作者简介： 张明(1960—)，男,教授,博士.
