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Effect of specimen geometry on fatigue crack growth rates for the railway axle material EA4T

: Varfolomeev, I.; Luke, M.; Burdack, M.


Beretta, S.:
Damage tolerance of railway axles : Result of a TC24 meeting held at Politecnico di Milano, Dipartimento di Meccanica, on 13 - 14th October 2008
Amsterdam: Elsevier, 2011 (Engineering fracture mechanics 78.2011, Nr.5)
TC24 Meeting <2008, Milano>
Konferenzbeitrag, Zeitschriftenaufsatz
Fraunhofer IWM ()

This paper presents experimental results on fatigue crack growth propagation for the EA4T steel widely employed in the manufacturing of railway axles. Apart from standard M(T) and C(T) specimens, the investigations include bending tests on cylindrical bars and rectangular plates containing semi-elliptical surface cracks, geometries representative of surface flaws in components. The results give an evidence of the crack growth rate dependency upon the geometry and loading conditions of cracked specimens. The paper also concludes that fatigue crack growth rates correlate with crack tip plasticity, even within low and middle stress intensity factor ranges. Some remarks are provided with respect to the significance of the results for assessing residual lives of railway axles under in-service conditions.