Browsing by Author "Ferreira, Luis A.A."
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- Wear and surface residual stress evolution on twin-disc tests of rail/wheel steelsPublication . Batista, António Castanhola; Peixoto, Daniel F.C.; Nobre, João P.; Coelho, Luís Manuel de Jesus; Ramos, Diogo Mesquita; Ferreira, Luis A.A.; Castro, Paulo M.S.T. deTwin disc tribological tests were performed in wheel and rail materials, with specimens taken from a Spanish AVE train wheel and a UIC60 rail, in a program intended to characterize their contact fatigue behavior. The X-ray diffraction technique was used to characterize the residual stress distribution at the initial and damaged stages, as well as in intermediate stages, since existing residual stresses in the surface layers of the railways steels and its evolution during contact loading can have a major influence on crack initiation and propagation.
- X-ray diffraction residual stress measurements for assessment of rolling contact fatigue behaviour of railway steelsPublication . Batista, António Castanhola; Nobre, João P.; Peixoto, Daniel F.C.; Ferreira, Luis A.A.; Castro, Paulo M.S.T. de; Coelho, Luís Manuel de JesusRolling contact fatigue twin-disc tests were performed on rail/wheel steels from Spanish high velocity trains (AVE). Residual stress profiles were determined using X-ray diffraction before and after cyclic loading. The evolution of residual stress profiles, due to cyclic loading, was analysed in order to study how they affect the rolling contact fatigue behaviour of these materials. This study is included in a major project where other related phenomena and materials’ properties have been studied.