Study on Fatigue Performance of Stainless Steel Spot Welded Structures for Rail Vehicles
Journal Title: Urban Mass Transit - Year 2024, Vol 27, Issue 5
Abstract
Objective To enhance the fatigue resistance of stainless steel vehicle carbodies and obtain fatigue characteristic curves of spot welded joints, thereby guiding fatigue analysis and structural design of stainless steel spot welded rail vehicles, it is necessary to study the fatigue performance of stainless steel spot welded structures for rail vehicles. Method Summarizing the types of spot welded joints in an existing vehicle model, stainless steel resistance spot welding butt joint specimens and arc breakdown welding butt joint specimens are fabricated based on the characteristics of spot welded joints. According to the fatigue failure principles of spot welding and metal materials, finite element analysis and experimental methods are used to experimentally verify and compare the fatigue performance of stainless steel spot welded joints. Result & Conclusion ΔF-N curves for 12 different types of spot welded joints are obtained, through failure analysis, the cracking of the specimens originated from the surface of the heat-affected zone of the weld seam is detected, and the initiation of fatigue cracking is related to transgranular crack-like defects on the steel plate surface. The influence of welding type and plate thickness parameters on the fatigue life of joints is summarized: for the same plate thickness combination, selecting the arc breakdown welding method would result in a higher fatigue life of the joint; for joints with the same welding type, those with larger plate thickness demonstrate better fatigue performance. If the thickness of one plate is larger than the other in comparison to another type of joint, the one with a larger difference in plate thickness will have a longer fatigue life under low load amplitude. However, if a certain limit is exceeded, the one with a smaller difference in plate thickness will have a longer fatigue life.
Authors and Affiliations
Juxing LIANG, Jia SUN
Keywords
Related Articles
- EP ID EP735628
- DOI 10.16037/j.1007-869x.2024.05.025
- Views 32
- Downloads 0
Permanent Shaft Repair Technology for Damaged Shield Segments in Operating Metro Tunnels
[Objective] During the drilling construction of ground surface dewatering shaft in a metro operational interval shield tunnel, the tunnel segments were damaged due to being pierced, resulting in sudden water hazards to i...
Lightning Test and Simulation Research for Medium-speed Maglev Train
Objective When medium-speed maglev trains operate on elevated tracks, the carbody is susceptible to lightning strikes. If composite materials are adopted for medium-speed maglev train carbody, damage or even penetration...
Basic and Alternative Route Determination in Interlocking Table and Conflicting Signal Verification for Urban Rail Transit Depot
[Objective] As the standard for debugging, opening, acceptance, and subsequent use of computer interlocking devices, the interlocking table plays a crucial role in improving operation efficiency, extending equipment life...
Harmonic Detection and Suppression Method for High-speed Maglev Trains Based on Adaline Algorithm
[Objective] In order to reduce the impact of high-speed maglev harmonics on traction network, and to ensure the normal operation of high-speed maglev trains, it is necessary to study the harmonic characteristics of the h...
VR Simulation Modeling for Intervention of Urban Rail Transit Station Staff Behavior on Passenger Emergency Evacuation Path Choice
Objective To effectively reflect the real-time impact of urban rail transit station staff behavior on evacuation, and to solve the problem that the adoption of predefined static path method for evacuation route planning...