effects on rolling contact fatigue performance

The effects of surface and near surface tensile stresses on rolling contact fatigue initiation are discussed based upon measurement of residual stresses and observations of bearings run under both full lubrication (high lambda) and thin film (low lambda) conditions Previous work considers the appl The effects of ultrasonic deep rolling (UDR) on the fatigue behavior of pre-corroded 7A52 aluminum alloys were investigated By means of X-Ray diffraction stress measurements and scanning electron microscopy (SEM) residual stress and fractograph of 7A52 aluminum alloys with and without UDR treatment were analyzed The results indicated that the UDR produced compressive residual stresses

Rolling/Sliding Contact Fatigue Life Physics and

2020-2-18TECHNOLOGY AREA(S): Air Platform OBJECTIVE: Develop a standalone software package that can: (1) generate a physics based rolling contact fatigue model which accurately predicts both subsurface and surface initiated failure modes and (2) accurately predicts rotorcraft engine and drive system rolling element bearing life and durability based upon the generated model

The effects of ultrasonic deep rolling (UDR) on the fatigue behavior of pre-corroded 7A52 aluminum alloys were investigated By means of X-Ray diffraction stress measurements and scanning electron microscopy (SEM) residual stress and fractograph of 7A52 aluminum alloys with and without UDR treatment were analyzed The results indicated that the UDR produced compressive residual stresses

Effect of Fillet Rolling Load on the Fatigue Performance of a Micro-Alloy Steel Diesel Engine Crankshaft To cite this article: Gl evik and Rza Grbz 2017 J Phys : Conf Ser 843 012044 View the article online for updates and enhancements Related content Fatigue performance of blade steel T552 in a corrosive environment

2017-9-27intermediate fatigue life are: (1) shot-peening and (2) surface rolling Both methods use local plastic deformation one by the pressure of the impact of small balls the other by the pressure of narrow rolls Surface rolling is widely used in the production of threads It is very economical as a forming operation for bolts and screws as well as

2019-5-17Wear and rolling contact fatigue (RCF) are two of the most crucial subjects 10 11 Due to the improvement of wear resistance of ferrite–pearlite steel by optimizing chemical composition and adopting strengthening methods 12 the failure caused by wear is rare to happen while RCF becomes more common and represents one of the main failure causes

Bearing size

The performance of each component contributes to or determines the performance and life of the bearing Consider these aspects: Rolling contact fatigue (RCF) on the rolling elements and raceways – this is the primary aspect that dictates bearing life in most applications taking into account the possible effects of rolling contact fatigue

2004-6-23rod rolling-contact-fatigue(RCF) tester The as-ground silicon nitride rods (Ra 0 18 mm) exhibited neither wear nor spalling in the RCF tests while the ground-and-lapped silicon nitride rods (Ra 0 08 mm) showed no wear but occasional spalling failure w6x The rolling contact fatigue performance of ceramicyceramic contact

2020-2-18Rolling contact fatigue has been the subject of significant investigation since the early 1940s [4 5] In order to improve RCF behavior heat treatments have been commonly used to induce compressive residual stresses within the material A number of investigators have studied the effects of compressive residual stresses on rolling contact fatigue

2016-5-16effects of influential parameters such as residual stresses on fatigue behavior and methods of their production in crankshafts were discussed The review also included a comparison of crankshaft material and manufacturing process technologies in terms of their durability performance as well as assessment procedures used for crankshafts

2018-12-17n rolling contact fatigue (RCF) cracks usually initiate from inclusions beneath the surface and they propagate to form flakes [1 2] Although nonmetallic inclusions are known to have a detrimental effect on the fatigue performance of high-strength steels the commercial production of steels with very high cleanliness is unrealistic

2019-10-9Effects of residual stress and material gradients produced by induction hardening on rolling contact fatigue Hoa Ngan NGUYEN ABSTRACT This research was conducted to provide a better understanding of the effects of induction hardening on rolling contact fatigue (RCF) using a finite element analysis The finite element

Abstract A review of some of the recent work on the mechanism of rolling contact fatigue (RCF) is presented Topics covered include the appearance and classification of RCF and the processes of strain localization texture development microstructural change crack formation crack shape and propagation and through-fracture It is concluded that a significant barrier to progress is the poor

Li Meng Beibei Zhu Chen Xian Xiaoyan Zeng Qianwu Hu Dengzhi Wang Comparison on the wear properties and rolling contact fatigue damage behaviors of rails by laser cladding and laser-induction hybrid cladding Wear 10 1016/j wear 2020 203421 (203421) (2020)

The Acute Effects of Foam Rolling on Fatigue

The purpose of this study was to examine the effects of self-myofascial release (MFR) via foam rolling immediately following strenuous activity on acute fatigue-related impairments of muscular performance Healthy male (n = 16) and (n = 9) subjects visited the laboratory three separate times During visit 1 subjects were familiarized with performance testing procedures and the foam

2019-12-2Review of the damage mechanism in wind turbine gearbox bearings under rolling contact fatigue Yun-Shuai SU 1 Shu-Rong YU 1 () Shu-Xin LI 1 2 () Yan-Ni HE 1 1 School of PetroChemical Engineering Lanzhou University of Techno-logy Lanzhou

Predicting fatigue performance in concentrated contacts under thin film (or mixed) lubrication conditions has historically involved various empirical approaches Typically a lubrication parameter is used in an experimentally derived equation to predict the expected rolling contact performance Howev

The effects of deep-nitriding and following shot peening on microhardness rolling contact fatigue property of 32Cr3MoVA steel were investigated and Scanning Electron Microscope (SEM) was employed to evaluate the failure surface of rolling contact fatigue specimens The fatigue results indicate that the depth of deep-nitrided layer is about 0 75 mm and following shot peening can improve the

2017-3-18Microstructural and Material Quality Effects on Rolling Contact Fatigue of Highly Elastic Intermetallic NiTi Ball Bearings Christopher DellaCorte S Adam Howard Fransua Thomas and Malcolm K Stanford National Aeronautics and Space Administration

Results reported here comparing vented and unvented bearing housings in rolling contact fatigue (RCF) tests with a linear perfluoropolyalkylether (PFPAE) lubricant and VIM-VAR M50 steel at 316C and a stress of 4 8 GPa clearly show that significantly more wear corrosion and fluid breakdown occur in the closed system than in the open system

2004-6-23on the RCF performance Rolling contact fatigue is a significant factor in the failure of components in rolling/sliding contact Although sintered ceramics have provided improvements in RCF life of components in rolling/sliding contact e g hybrid ceramic bearings the

CiteSeerX - Document Details (Isaac Councill Lee Giles Pradeep Teregowda): Abstract: Accelerated rolling contact fatigue four-ball tests were performed on Hot Isostatically Pressed (HIPed) silicon nitride/steel contacts under lubricated condition using a PLINT TE92/HS Microprocessor Controlled Rotary Tribometer at a maximum compressive stress of 6 58GPa and at a speed of 10 000 rpm for

Predicting fatigue performance in concentrated contacts under thin film (or mixed) lubrication conditions has historically involved various empirical approaches Typically a lubrication parameter is used in an experimentally derived equation to predict the expected rolling contact performance Howev