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28
Sep
2023
Technical Reports
Enhancing the Safety of Coupler Knuckles
Subject
Rolling Stock
Keywords: Coupler, knuckle, failure, fatigue, fracture, life calculation, load case combination, stress, tensile strength, train operation
Abstract: The primary objective of this research was to validate the finite element (FE) stress levels obtained during previous research through physical testing of a selected knuckle...
Report Number
DOT/FRA/ORD-23/32
Office
RDI-22
28
Sep
2023
Technical Reports
Bearing Grease Degradation Related to Water and Roller Bluing
Subject
Rolling Stock
Keywords: Coupler, knuckle, failure, fatigue, fracture, life calculation, load case combination, stress, tensile strength, train operatio Roller bearings, water-etch, non-verified bearing failure, testing, rolling stock, lube stain, grease
Abstract: The Federal Railroad Administration sponsored a team from Transportation Technology Center, Inc. to conduct two investigations to improve the safety of roller bearing...
Report Number
DOT/FRA/ORD-23/33
Office
RDI-22
21
Sep
2023
Technical Reports
Vertical Split Rim: Causes and Prevention
Subject
Rolling Stock
Keywords: Vertical split rim, VSR, wheel cracks, finite element analysis, FEA, residual stress, fatigue damage models, finite element, FE
Abstract: Vertical split rim (VSR) is a serious railway wheel failure mode that requires further research. Visual clues are not usually present until the crack propagates through the rim...
Report Number
DOT/FRA/ORD-23/30
Office
RDI-22
15
Sep
2023
Technical Reports
Vehicle Dynamics Models for Derailment Incident Investigation
Subject
Rolling Stock
Keywords: Derailment, freight car dynamics, vehicle dynamics, VAMPIRE simulations, vehicle track interaction, wheel rail interaction
Abstract: When investigating a train derailment, vehicle/track interaction (VTI) using vehicle dynamics simulations of the key vehicles in the derailed train can help identify specific...
Report Number
DOT/FRA/ORD-23/27
Office
RDI-22
5
Sep
2023
Technical Reports
Torsional Strength and Stiffness of a Passenger Car Coupling System
Subject
Rolling Stock
Keywords: Full Scale Testing, H couplers, Coupler Torsion, Torsional Transmission
Abstract: Between September 2019 and June 2022, the Federal Railroad Administration (FRA) sponsored a research team from Sharma & Associates to model and test the torsional strength...
Report Number
DOT/FRA/ORD-23/24
Office
RDI-22