A B S T R A C T A new surface induction hardening technology was designed for the purpose of increasing the resistance of railway wheelsets to fatigue damage. This paper gives a detailed presentation of the technological aspects of induction hardening of axles. The increased fatigue resistance in hardened surfaces compared with standard heat treatment of EA4T steel was verified using tensile test specimens, press-fitted wheel seat/axle joints at 1:3 scale and press-fitted wheel/axle joints at actual size. The 70% increase in the fatigue limit of induction hardened EA4T steel specimens compared with material subjected to standard heat treatment clearly demonstrates the effectiveness of this technology.A = parameter A 5 = ductility B = parameter C = parameter d = axle body diameter D = wheel seat diameter f = loading frequency f i = frequency HV30 = hardness i = test level M = bending moment q = notch sensitivity parameter R = aspect ratio R e = yield strength R fL = fatigue limit for the smooth specimen R fE = fatigue limit for notched specimen R m = tensile strength R 0 = the lowest level of stress ŝ = standard deviation W o = modulus of resistance of the test specimen section δ = difference in stress between neighbouring test levels Δ = parameter depending on A, B, C ε_ = strain rate I N T R O D U C T I O NDemands for higher reliability and safety of railway vehicles have brought intensive research of degradation processes in railway wheelsets 1-3 and new approaches to wheelset design. 4 Extremely high repeated contact stresses between wheels and rails cause rolling contact fatigue. 1,2 A very serious form of damage to wheel seats is fretting fatigue, caused by small-amplitude oscillatory movement of wheels in press-fitted seat/axle joints. 3
This papers deals with the new design of resilient wheels with high radial elasticity comparing another designs. The aim of this new wheel design is to increase passenger comfort and noise reduction during service of tram cars in cities. Tyre of the wheel is designed also as brake disc. In this paper will be describe also results of laboratory test of the wheel stiffness and comparison with previous wheel generation including other wheel parameters. Because primary role of the wheel is done by rubber segments also its results will be described.
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