球面接触面积对扣件T形螺栓应力的影响  

Influence of Sphere Contact Area on Stress of T-shape Bolt in Fastener

作　　者：王敏 李子睿[2] 马晓华 WANG Min LI Zirui MA Xiaohua(Beijing Urban Construction Design ＆ Development Group Co.,Ltd., Beijing 100081, China China Academy of Railway Sciences, Beijing 100081 , China)

机构地区：[1]北京城建设计发展集团股份有限公司,北京100081 [2]中国铁道科学研究院,北京100081

出　　处：《铁道建筑》2016年第12期102-104,共3页Railway Engineering

摘　　要：利用有限元方法建立数值计算模型,模拟北京地铁14号线扣件系统T形螺栓的实际工作状态,并通过改变螺栓轴向约束面积模拟球面的实际接触面积,分析T形螺栓在不同边界条件下螺栓根部的最大等效应力分布,对比T形螺栓屈服极限应力,分析不同约束面积对T形螺栓强度的影响。根据数值计算结果得出结论:随着轴向约束面积的减小,T形螺栓根部最大等效应力逐渐增大,当轴向约束面积小于球面1/3时,螺栓根部最大等效应力超过螺栓强度极限,此时螺栓发生屈服破坏。The numerical calculation model was established by using the finite element method to simulate the T-shape bolt actual working state of fastening system in Beijing metro line No.14,the maximum equivalent stress distribution of T-shape bolt root under different boundary conditions was studied through simulating the actual sphere contact area which was changed with bolt axial restraint area,and influence of different restraint area on the strength of T-shape bolt was analyzed by comparing the yield ultimate stress of T-shape bolt.The numerical calculation results showthat the maximum equivalent stress of T-shape bolt root increases gradually with the decrease of the axial restraint area,the maximum equivalent stress of T-shape bolt root is beyond the bolt strength limit when the axial restraint area is less than one third of the sphere area and the yield failure of bolt happens at the same time.

关 键 词：T形螺栓 约束面积 球面接触面积 应力 有限元 

分 类 号：U213.53[交通运输工程—道路与铁道工程]