中国铁道科学2018，Vol.39Issue(2)：137-143,7.DOI:10.3969/j.issn.1001-4632.2018.02.17
转向架安全吊装结构的断裂原因及改进对策
Fracture Reason for Safety Hoisting Structure of Bogie and Its Improvement Measure
摘要
Abstract
Many fracture problems occurred in the bolt hole of the bolster safety hoisting structure of 209P type passenger car bogie.According to the force analysis of safety hoisting structure,the fracture was analyzed by physical and chemical tests.The result indicates that the fracture is fatigue fracture,which initiates from the stress concentrated corner at the edge of bolt hole.The simulation model of safety hoisting structure was established using the finite element software ANSYS and the stress was analyzed.The result indicates that the force at the edge of bolt hole is little under normal working condition,and the fracture is mainly related to dynamic stress.Such dynamic tests as modal test,the dynamic stress test of the line and vibration acceleration test were carried through to further analyze fracture reason.Improvement measure was put forward and the application assessment was carried out.Results show that the first order mode 92 Hz of the safety hanging seat is similar to the main frequency 90 Hz of the line,which leads to the vibration amplification of the safety hoisting structure during train operation.The amplified vibration makes the bolt hole of the safety hanging seat endure a larger vertical alternating dynamic stress,which causes the crack at the weak part of bolt hole to initiate and expand continuously until fracture.Under the premise of ensuring the carrying capacity of safety hoisting structure,the safety hanging of steel strip structure is changed to the safety hanging of the wire rope structure.Similar fracture problems can be eliminated by changing the modal of safety hoisting structure.关键词
安全吊装结构/安全吊座/安全吊/断裂/疲劳/动应力/振动放大/振动模态Key words
Safety hoisting structure/Safety hanging seat/Safety hanging/Fracture/Fatigue/Dynamic stress/Vibration amplification/Vibration mode分类
交通工程引用本文复制引用
张相宁,李建锋,刘东亮,贾尚帅,李明高,孙晖东,郭涛,高峰..转向架安全吊装结构的断裂原因及改进对策[J].中国铁道科学,2018,39(2):137-143,7.基金项目
国家重点研发计划项目(2016YFB1200403) （2016YFB1200403）
中国铁路总公司科技研究开发计划项目(2016J002-D) （2016J002-D）
