Static And Dynamic Analysis Of High Speed Railway WJ-7 Fastening

Ballastless track is the main form of the track structure in China and most countries in the world high-speed railway fastener technology is the key technology of ballastless track structure,its working principle is to use a self fastening elastic elastic deformation buckle pressure,relieve the mechanical vibration and impact,to prevent the occurrence of rail longitudinal and transverse displacement of structure rail and rail effectively for a long time together as a whole.High speed railway fastener of short service life and maintenance cost of fastener is an urgent need to solve the problem of high iron operation.In order to better and faster development of high-speed railway,it is necessary to carry out in-depth research on ballastless track fastener fatigue durability.The paper includes an elastic bar fastener insulation block,a detailed finite element model of WJ-7 iron plate and bolt,the static and dynamic analysis.The elastic strip is a key component of the fastener function,also no fatigue breakage in ballast less track fastener and the most frequent maintenance and replacement parts,the elastic stress variation analysis and calculate the fatigue life.The study shows that the WJ-7 fastener installation bolt pressure required should be 30kN;the elastic force is very complex.The location of each main force characteristics of different straight sections elastic inner arm after bending limbs inside the Mises stress and shear stress maximum,elastic and bolt contact normal stress maximum,elastic maximum Mises stress than normal installation in place of growth of 1.3%,the installation of railway rail vertical displacement control at 0.5mm?-1mm is conducive to the elastic strip used for a long time.The curve road bomb Mises stress increased 3.8%more than normal installation in place;curve right,on the left side of the rail fastening elastic rod impact force is larger than the right,to improve the service condition,the left rail fastener bolt pre pressure may be appropriate to adjust little.The article on the fastening system model of modal analysis,the results show that the vibration frequency of 1?10 mode the fastener is greater than 300Hz,fastening elastic rod with the track structure not resonance.The application of vehicle track coupling theory,elastic dynamic time history analysis Mises maximum stress ratio maximum Mises analysis of changes in the static displacement of rail stress increases by 7.6%,the train speed more quickly due to the impact load is bigger,more a great influence on stress elastic fatigue life.The elastic bar in the static and dynamic analysis of the most dangerous points are more than 5 million times,can meet the requirements of relevant standards;the first elastic fatigue damage location of elastic bar Under the action of dynamic force,the fatigue life of the elastic strip under the action of the force is reduced sharply,which has good theoretical significance and engineering application prospect.