基于格点型有限体积法的活塞高周疲劳分析  

Analysis of piston’s high-cycle fatigue based on cell-vertex finite volume method

作　　者：龚京风 徐宗著 宣领宽[2] Gong Jingfeng;Xu Zongzhu;Xuan Lingkuan(College of Automobile and Traffic Engineering, Wuhan University of Science and Technology, Wuhan 430065, China;National Key Laboratory on Ship Vibration and Noise, China Ship Development and Design Center, Wuhan 430064, China)

机构地区：[1]武汉科技大学汽车与交通工程学院,湖北武汉430065 [2]中国舰船研究设计中心船舶振动噪声重点实验室,湖北武汉430064

出　　处：《武汉科技大学学报》2022年第3期204-212,共9页Journal of Wuhan University of Science and Technology

基　　金：国家自然科学基金资助项目(51909197).

摘　　要：针对柴油机活塞高周疲劳问题,基于格点型有限体积方法(CV-FVM)建立高周疲劳数值模型,并采用C开发求解程序。使用该程序计算矩形孔板的最大等效应力和疲劳寿命,并与有限元法计算值及其他文献的研究结果进行对比,验证了本文模型的正确性。利用该数值模型进行燃气压力作用下某活塞的高周疲劳性能分析,其结果与有限元法的计算结果相一致。分析表明,在机械载荷作用下,活塞的von Mises等效应力与疲劳寿命成反比,最小疲劳寿命出现在活塞销孔上表面内侧,与最大等效应力所处区域一致,因此预测活塞高周疲劳寿命时要重点关注销孔位置的应力情况。In order to analyze high-cycle fatigue properties of diesel engine pistons,a numerical model of high-cycle fatigue was established based on cell-vertex finite volume method(CV-FVM),and the solver was developed by using C language.The program was used to calculate the maximum equivalent stress and fatigue life of a rectangular orifice plate,and the results were compared with those of finite element method and other literatures,which verified the correctness of the proposed model.Then the numerical model was used to analyze the high-cycle fatigue performance of a piston under gas pressure,and the results were in good agreement with those of finite element method.The analysis shows that von Mises equivalent stress of the piston under mechanical load is inversely proportional to its fatigue life.The minimum fatigue life is located inside the upper surface of the piston pin hole which is exactly the region of the maximum equivalent stress.Therefore,the stress of pin hole should be paid more attention to when predicting the piston’s high-cycle fatigue life.

关 键 词：格点型有限体积法 活塞 高周疲劳 疲劳寿命 数值模型 等效应力 

分 类 号：TK422[动力工程及工程热物理—动力机械及工程]