Damage Tolerance of Induction-Hardened S38C Railway Axles Subjected With Foreign Object Damage at Low Temperature
Abstract
The safety of high-speed railway axles is threatened by defects, including inclusions, corrosion pits, fretting damage and foreign object impact damage. Temperature is an important factor influencing the damage mechanism and the subsequent fatigue behavior of railway axles. Previous work mainly focuses on the damage tolerance of railway axles with impact damage at room temperature, while giving less consideration on low temperature. To illustrate the influence of low temperature on the formation of impact damage on induction-hardened S38C railway axles, specimens were kept at -40 ℃ and then shot by projectiles made of tungsten steel at varying velocities. The micro-macro morphologies of impact damage were observed by optical microscope and scanning electronic microscope. The fatigue behavior of damaged specimens was evaluated by four-point bending fatigue test.
Shun-Peng Zhu
Professor
Ph.D, Professor, Doctoral Supervisor, PIF Fellow of Politecnico di Milano, Italy since April 2016 and research associate at University of Maryland, United States from 2010 to 2011. His research which has been published in scholarly journals and edited volumes, over 100 peer-reviewed book chapters, journals and proceedings papers, explores the aspects: Fatigue assessment; Probabilistic Physics of Failure modeling; reliability and risk analysis; Multi-physics damage modeling and life prediction under uncertainty; Multi-scale uncertainty quantification and propagation; Bayesian inference and Fuzzy sets; Probability-based life prediction/design for engineering components/materials. Dr. Zhu also studies advanced numerical methods for uncertainty quantification in engineering. He received the Award of Merit of European Structural Integrity Society (ESIS)-TC12 in 2019, Most Cited Chinese Researchers (Elsevier) in the field of Safety, Risk, Reliability and Quality since 2018, 2nd prize of the National Defense Science and Technology Progress Award of Ministry of Industry and Information Technology of China in 2014, Polimi International Fellowship in 2015, Hiwin Doctoral Dissertation Award in 2012, Best Paper Awards of several international conferences and Elsevier Outstanding Reviewer Status. He serves as guest editor, editorial board member of several international journals and Springer book series, Organizing Committee Co-Chair of the International Conference on Quality, Reliability, Risk, Maintenance, and Safety Engineering (QR2MSE 2013), TPC Member of ICMR 2015, ICMFM XIX 2018-2020 and IRAS 2019.