Fatigue Failure Analysis And Safety Evaluation Of Typical Structure Of High-speed Railway Catenary

With the continuous construction of China’s high-speed railway,as of 2018,the total mileage of the high-speed rail business exceeded 29 thousand kilometer,exceeding the total2/3 mileage of the world’s high-speed rail.Under such a huge railway catenary system,all kinds of fault occurs frequently.So fatigue failure analysis and safety assessment for catenary system structure can make the catenary reliable security a big improvement.Catenary structural damage caused by metal fatigue failure is a failure that catenary often appear.This paper introduces the theory of fatigue failure,and Goodman,Gerber and Soderberg fatigue life curve,metal S-N curve,Miner theory,rain-flow counting method.And based on ANSYS Workbench software with the above knowledge,build droppers model,mesh,set the relevant conditions,static analysis and fatigue analysis.Static analysis shows that maximum force appears where the side of the wires contact,and the minimum outside the droppers line.Fatigue analysis shows that the position of the line near the clamp pressure pipe is the part that has the shortest the fatigue life,which is 1.5876×10~6 times,the fatigue life of the position of the contact between the side of the wire is also relatively short,prone to fatigue damage,the position outside the droppers line has the longest fatigue life.Through the above analysis,the paper summarizes processes of fatigue analysis using ANSYS software and finish its details.Finally fatigue test is introduced,which is compared with fatigue analysis using software.This article also introduces the concept of safety assessment,meaning purpose.I introduce qualitative and quantitative evaluation of the safety evaluation including comparative safety check list,preliminary hazard analysis,fault tree analysis and fuzzy mathematical appraise,etc.I draw the fault tree by the fault tree analysis with catenary contact suspension failure as the top event of the fault tree drawn,and summarize the various potential reasons failure from catenary contact suspension failure.