X-Ray Diffraction Residual Stress Measurements for Assessment of Rolling Contact Fatigue Behaviour of Railway Steels

Abstract

Abstract. Rolling 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.

Rapid evaluation of fatigue limit on thermographic data analysis

“…So it is a very hard task to use traditional methods to optimize fiber proportion and ply scheme of composites. Therefore, various theories and rapid methods have been developed to estimate fatigue limit in a short time for both metallic materials and composites, such as X-ray method [4][5][6][7], acoustic emission method [8][9][10][11], mechanical analysis method [12][13][14][15], simulation method [16][17][18][19], and infrared thermographic method. Among that, the thermography method which is based on self-heating phenomena is most widely used in engineering applications, such as Luong's method [20][21][22][23] and Risitano's method [24][25][26][27][28].…”