Fatigue strength assessment of railway axles considering small-scale tests and damage calculations

Small scale fatigue tests aimed at determining the S-N diagram and the Miner Index to be adopted for fatigue damage assessment Portugal Small scale fatigue tests aimed at determining the S-N diagram and the Miner Index to be adopted for fatigue damage assessment testcs performed on steel grades EA4T and EA1N adopted by the European EN13103/13104 standards with both constant and vari- of railway axles were carried out within the frame of the frame of the research activities of EU funded EURAXLES project. Fatigue CeFEMA, Department of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001 Lisboa, of railway axles were carried out within the frame of the frame of the research activities of EU funded EURAXLES project. Fatigue able amplitude loading are reported. The variable amplitude loading fatigue tests were carried out by using loading spectra derived tests performed on steel grades EA4T and EA1N adopted by thePoEruturogaplean EN13103/13104 standards with both constant and vari- tests performed on steel grades EA4T and EA1N adopted by the European EN13103/13104 standards with both constant and vari- from actual load measurements of fatigue bending moment in railway axles under significant service conditions. The consistent able amplitude loading are reported. The variable amplitude loading fatigue tests were carried out by using loading spectra derived able amplitude loading are reported. The variable amplitude loading fatigue tests were carried out by using loading spectra derived version of Miner’s rule (according to the FKM-Guideline) with an allowable damage sum D = 0.3 adopted in combination with from actual load measurements of fatigue bending moment in railway axles under significacrnit service conditions. The consistent from actual load measurements of fatigue bending moment in railway axles under significant service conditions. The consistent 2.5A%bsptrearcetntile (p2.5%) of the S-N curve derived experimentally with small specimens proved to be adequate as design criterion, version of Miner’s rule (according to the FKM-Guideline) with an allowable damage sum Dcrit = 0.3 adopted in combination with version of Miner’s rule (according to the FKM-Guideline) with an allowable damage sum Dcrit = 0.3 adopted in combination with thus enabling the transferability of small scale fatigue tests to full scale railway axles that would lead to improved fatigue resistance 2.5% percentile (p2.5%) of the S-N curve derived experimentally with small specimens proved to be adequate as design criterion, 2.5% percentile (p2.5%) of the S-N curve derived experimentally with small specimens proved to be adequate as design criterion, ofDrauirliwnagytahxeliersowpiethrantieown,demsoigdnesr.n aircraft engine components are subjected to increasingly demanding operating conditions, thus enabling the transferability of small scale fatigue tests to full scale railway axles that would lead to improved fatigue resistance thus enabling the transferability of small scale fatigue tests to full scale railway axles that would lead to improved fatigue resistance.