scholarly journals Parametric sizing study for the design of a lightweight composite railway axle

2021 ◽  
pp. 113851
Author(s):  
P.J. Mistry ◽  
M.S. Johnson ◽  
S. Li ◽  
S. Bruni ◽  
A. Bernasconi
Keyword(s):  
Railway Axle

scholarly journals Effects of segment-structured DLC film on the fretting wear of railway axle journal bearings

2019 ◽  
Vol 6 (1) ◽  
pp. 18-00446-18-00446 ◽  
Author(s):  
Yoshiaki OKAMURA ◽  
Daisuke SUZUKI ◽  
Kazuki IKOMA ◽  
Takafumi NAGATOMO ◽  
Hiroshi UTSUNOMIYA
Keyword(s):  
Journal Bearings ◽  
Fretting Wear ◽  
Dlc Film ◽  
Railway Axle

The Strain Analysis at the Broadening Stage of the Hollow Railway Axle by Multi-Wedge Cross Wedge Rolling

2014 ◽  
Vol 494-495 ◽  
pp. 457-460 ◽  
Author(s):  
Bin Hu ◽  
Xue Dao Shu ◽  
Peng Hui Yu ◽  
Wen Fei Peng
Keyword(s):  
Production Efficiency ◽  
Strain Analysis ◽  
Cross Wedge Rolling ◽  
Forming Process ◽  
Element Analysis ◽  
Forming Mechanism ◽  
Railway Axle ◽  
The Finite Element Analysis ◽  
Scientific Significance ◽  
Deform 3D

The paper is based on the newest hollow railway axle, which utilizes the Pro/E designed multi-wedge cross wedge rolling (MCWR) model, utilizes the finite element analysis software DEFORM-3D to complete the numerical simulation about the whole stage of the hollow railway axle forming process, and analyzes the strain rule at the broadening stage of the hollow railway axle, especially conducts a detailed research on forming character into the strain rule at the multi-wedge transition stage, and finally gets the strain forming mechanism of the hollow railway axle at the broadening stage. The result of the research on the strain rule poses great scientific significance on enhancing the product quality and the production efficiency of the hollow railway axle, and improving the theory of multi-wedge cross wedge rolling.

scholarly journals Methodology for estimation of residual stresses in hardened railway axle

2019 ◽  
Vol 23 ◽  
pp. 185-190
Author(s):  
Pavol Dlhý ◽  
Jan Poduška ◽  
Pavel Pokorný ◽  
Luboš Náhlík ◽  
Rostislav Fajkoš ◽  
...  
Keyword(s):  
Residual Stresses ◽  
Railway Axle

scholarly journals Railway Axle Condition Monitoring Technique Based on Wavelet Packet Transform Features and Support Vector Machines

Sensors ◽  
2020 ◽  
Vol 20 (12) ◽  
pp. 3575 ◽  
Author(s):  
María Jesús Gómez ◽  
Cristina Castejón ◽  
Eduardo Corral ◽  
Juan Carlos García-Prada
Keyword(s):  
Condition Monitoring ◽  
Wavelet Packet ◽  
Wavelet Packet Transform ◽  
Support Vector ◽  
Good Reliability ◽  
Railway Axle ◽  
Monitoring Technique ◽  
The Status ◽  
Minimum Number ◽  
Diagnosis Model

Railway axles are critical to the safety of railway vehicles. However, railway axle maintenance is currently based on scheduled preventive maintenance using Nondestructive Testing. The use of condition monitoring techniques would provide information about the status of the axle between periodical inspections, and it would be very valuable in the prevention of catastrophic failures. Nevertheless, in the literature, there are not many studies focusing on this area and there is a lack of experimental data. In this work, a reliable real-time condition-monitoring technique for railway axles is proposed. The technique was validated using vibration measurements obtained at the axle boxes of a full bogie installed on a rig, where four different cracked railway axles were tested. The technique is based on vibration analysis by means of the Wavelet Packet Transform (WPT) energy, combined with a Support Vector Machine (SVM) diagnosis model. In all cases, it was observed that the WPT energy of the vibration signals at the first natural frequency of the axle when the wheelset is first installed (the healthy condition) increases when a crack is artificially created. An SVM diagnosis model based on the WPT energy at this frequency demonstrates good reliability, with a false alarm rate of lower than 10% and defect detection for damage occurring in more than 6.5% of the section in more than 90% of the cases. The minimum number of wheelsets required to build a general model to avoid mounting effects, among others things, is also discussed.

Phase proportions, carbon equivalent, mechanical properties and their effect on material cost of railway axle steels

MRS Advances ◽  
2018 ◽  
Vol 3 (37) ◽  
pp. 2169-2181
Author(s):  
D.E.P. Klenam ◽  
L.H. Chown ◽  
M.J. Papo ◽  
L.A. Cornish
Keyword(s):  
High Speed ◽  
Hsla Steel ◽  
Weight Fraction ◽  
Carbon Steels ◽  
Carbon Equivalent ◽  
Medium Carbon ◽  
Railway Axle ◽  
Material Costs ◽  
Material Cost ◽  
Hsla Steels

AbstractCommuter trains with solid axle configuration are produced from medium carbon steel due to cost restrictions. High-speed trains have hollow axle configuration for reduced weight and are made from high strength low-alloy (HSLA) steels. The HSLA steels have higher amounts of C, Cr, Ni, Mo, V and Nb, and are more expensive than medium carbon steels. The effects of phase proportions, carbon equivalent (CE), yield strength and ultimate tensile strength (UTS) on material costs of existing railway axle steels were studied using Thermo-Calc. Medium carbon rail axle steels had higher Fe3C phase proportions than the HSLA steel rail axle grades. Higher affinity of Cr, Mo and V for C than Fe resulted in decreased cementite proportions. The HSLA steels had yield strengths above 370 MPa, and UTS above 750 MPa, with increased material cost above $3300 per ton. A scattered distribution was observed for the pearlite weight fraction and material costs, with most between $3200 and $3400. The yield and tensile strengths increased with increasing carbon equivalent and pearlite weight fraction. The data aided the selection and design of alloys with better mechanical and corrosion properties at reduced material cost.

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