水轮机顶盖螺栓疲劳强度的影响因素研究  

Study on Influencing Factors of Fatigue Strength of Head Cover Bolts of Hydraulic Turbine

作　　者：葛新峰[1] 张敬 祝双桔 张雷[3] 赵雷 王金亮[4] 徐旭 郑圣义[1] GE Xin-feng;ZHANG Jing;ZHU Shuang-ju;ZHANG Lei;ZHAO Lei;WANG Jin-liang;XU Xu;ZHENG Sheng-yi(College of Energy and Electrical Engineering,Hohai University,Nanjing 210098,China;Chongqing Shipping Construction Development Co.,Ltd,Chongqing 401121,China;Yellow River Water Conservancy Research Institute,Zhengzhou 450003,China;Huanghe Wanjiazhai Water Multi-purpose Dam Project Co.,Ltd,Taiyuan 036499,China)

机构地区：[1]河海大学能源与电气学院,江苏南京210098 [2]重庆航运建设发展有限公司,重庆401121 [3]黄河水利科学研究院,河南郑州450003 [4]黄河万家寨水利枢纽有限公司,山西太原036499

出　　处：《水电能源科学》2021年第10期177-180,共4页Water Resources and Power

摘　　要：螺栓应力幅是决定螺栓疲劳强度的直接因素,螺栓应力幅越小,螺栓的疲劳强度越大。为了研究螺栓应力幅的影响因素,通过有限元方法对某顶盖及螺栓进行了整体建模和结构受力分析,提取了不同螺栓和法兰组合形式下螺栓的应力幅。结果表明,单法兰型式螺栓疲劳强度优于双法兰型式,下法兰型式螺栓疲劳强度优于上、中法兰型式;加厚双法兰结构法兰上板、下板、筋板厚度及上下板间距均可提高螺栓疲劳强度;增大螺栓头支撑直径和螺栓与法兰的接触面积,可提高螺栓的疲劳强度。The stress amplitude of bolt is the direct factor to determine the fatigue strength of bolt.The smaller the stress amplitude of bolt is,the greater the fatigue strength of bolt is.In order to study the influencing factors of the stress amplitude of bolt,this paper carries out the overall modeling and structural stress analysis of a certain head cover and bolt by finite element method,and extracts the stress amplitude of bolts under different bolt and flange combinations.The results show that the fatigue strength of single flange bolt is better than that of double flange bolt,and that of lower flange bolt is better than that of upper and middle flange bolt;The fatigue strength of double flange bolt can be improved by thickening the thickness of upper plate,lower plate,rib plate and spacing between upper and lower plates as well as increasing the support diameter of bolt head and the contact area between bolt and flange.

关 键 词：顶盖 螺栓 法兰 应力幅 疲劳寿命 

分 类 号：TK733.3[交通运输工程—轮机工程]