On the residual life assessment of high-speed railway axles due to induction hardening

Abstract

Surface hardening treatment can significantly increase the hardness of axle surface and introduce negative residual stress field into the axle. This work proposed an integrated stress rebuilding strategy of unit pressure and proportional integral approach to conduct the residual life prediction of an induction hardened axles and a load spectrum. A large crack aspect ratio a/c = 0.9 at the transition was used to predict the residual lifetime. It is well found that the hardened layer can provide a considerable fatigue resistance. Moreover, the critical stress region transfers to the inside of the axle or beneath the hardening layer rather than the free surface. Due to compressive residual stress, the evolved crack shape of hardened axles is completely different from original axles, showing a large aspect ratio. Totally, surface strengthened axles can acquire a prospective extended residual life. ARTICLE HISTORY

Experimental and numerical study on fretting wear and fatigue of full-scale railway axles

“…In such a case, the surface interaction between the crack surfaces was modelled via the self-contact algorithm, and both tangential and normal behaviours of the crack surfaces were guaranteed. The CoF between the crack surfaces was set as 0.60 [38], whilst a hard contact algorithm was used to describe the normal behaviour. Therefore, the compressive pressure could be effectively transferred through the crack surfaces, by which the crack closure can be well simulated.…”

A new critical plane-energy model for multiaxial fatigue life prediction of turbine disc alloys

“…In general, stress-based parameters are mainly applied for HCF life prediction, and contrariwise, strain-based parameters for lowcycle fatigue (LCF) life prediction [33][34][35][36][37][38][39][40][41][42]. Therefore, energy-based damage parameters are becoming more popular in recent researches due to its good ability for both HCF and LCF life prediction.…”

Critical plane–based multiaxial fatigue life prediction of turbine disk alloys by refining normal stress sensitivity

“…[15][16][17] In the process of multiaxial fatigue life estimation, how to relate the stress-strain response to the crack initiation process that occurs in the material is still the most essential part for fatigue design and reliability assessment of engineering components. [18][19][20][21][22][23][24][25][26][27][28] Until now, a large amount of critical plane approaches for damage modeling and life prediction under multiaxial loadings have been developed, including the models proposed by Wang-Brown (WB), 29,30 Fatemi-Socie (FS), 31 and Smith-Watson-Topper (SWT). 32 Brown and Miller 33 introduced a plane with the maximum shear strain (MSS) as the critical plane and modified the normal strain item on the same plane.…”

“…15–17 In the process of multiaxial fatigue life estimation, how to relate the stress–strain response to the crack initiation process that occurs in the material is still the most essential part for fatigue design and reliability assessment of engineering components. 18–28…”