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Dissertations / Theses on the topic 'Fatigue wear'

Author: Grafiati

Published: 28 June 2021

Last updated: 29 July 2025

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1

Watkins, Shaun Gareth. "Wear fatigue in nickel superalloys." Thesis, Swansea University, 2015. https://cronfa.swan.ac.uk/Record/cronfa43108.

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To date, work to assess the progression of wear and the effects of wear damage on low cycle fatigue has tended to be focused on specific components and their operating conditions. Although effective in the short term to solve today’s problems, these efforts often deliver insufficient understanding of the overall design space limits to have much influence of future component design. Therefore, the following research attempts to understand how wear damage progresses and how it impacts on fatigue performance in order to develop more accurate lifing models to predict the behaviour and life of real

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2

Alwahdi, Farag Abdullah Mohamed. "Wear and rolling contact fatigue of ductile materials." Thesis, University of Sheffield, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.421003.

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3

Sato, Meiji. "Wear and rolling contact fatigue of rail steels." The Ohio State University, 1991. http://rave.ohiolink.edu/etdc/view?acc_num=osu1335372747.

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4

Walker, David. "Wear of alumina-on-alumina hip prostheses : indentation, fatigue." Thesis, The University of Sydney, 1996. https://hdl.handle.net/2123/27592.

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A compressive fatigue testing apparatus was constructed and used to model the wear of alumina-on-alumina hip prostheses via asperity contact. A ball indenter was used to indent flat alumina specimens which has similar mechanical properties, and initial contact stress versus the number of cycles until wear initiation or to gross wear were plotted for two different grainsized aluminas.

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5

Dirks, Babette. "Simulation and Measurement of Wheel on Rail Fatigue and Wear." Doctoral thesis, KTH, Spårfordon, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-168023.

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The life of railway wheels and rails has been decreasing in recent years. This is mainly caused by more traffic and running at higher vehicle speed. A higher speed usually generates higher forces, unless compensated by improved track and vehicle designs, in the wheel-rail contact, resulting in more wear and rolling contact fatigue (RCF) damage to the wheels and rails. As recently as 15 years ago, RCF was not recognised as a serious problem. Nowadays it is a serious problem in many countries and ''artificial wear'' is being used to control the growth of cracks by preventive re-profiling and gri

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6

Iida, Yusuke. "The effects of magnetic fields on rolling contact fatigue wear." Thesis, Brunel University, 2007. http://bura.brunel.ac.uk/handle/2438/7405.

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The thesis describes the effects of the magnetic field in rolling contact tests of steel by using a two-disc machine and the investigation of its mechanism from contact stress analysis by using FEM and the agnetisation of a ferromagnetic substance. In the tests, two contact kinematic conditions, that is pure rolling and 10% rolling with sliding together with 1.1 and OAT [Tesla] of horizontal static magnetic fields created by permanent magnets were pplied. The results of optical and scanning electron microscopy observations show that finer wear particles and smoother worn surfaces are produced

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Leiro, Alejandro. "Wear and fatigue properties of isothermally treated high-Si steels." Licentiate thesis, Luleå tekniska universitet, Materialvetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26642.

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In recent years steels containing Si contents of 1,5% or more have been isothermally transformed in order to obtain a microstructure consisting of bainitic ferrite laths and retained austenite. The refined microstructure and presence of retained austenite has allowed the manufacture of steels with high tensile strength and considerable elongation. The work in this thesis is motivated by the need for more knowledge, especially regarding wear and fatigue properties before they can be used in engineering applications.In this work the rolling-sliding wear resistance and fatigue strength of ausferr

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8

Cuddon, Alan. "The wear of materials in an ash conditioner." Master's thesis, University of Cape Town, 1989. http://hdl.handle.net/11427/17665.

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Includes bibliographical references.<br>The abrasive nature of fly ash handled in large coal-fired power stations results in unacceptable material and maintenance costs in ash-water mixing plant. Wear testing has been carried out in situ using a variety of generic materials. A ranking order of wear performance has been established both as a function of material and operating costs, and it has been demonstrated that impressive cost savings can be effected by the use of ceramic-coated steel mixing blades. The performance of such composites has been found to be sensitive to the design and method

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9

Meyer-Rödenbeck, G. D. "An abrasive-corrosive wear evaluation of some aluminium alloys." Master's thesis, University of Cape Town, 1989. http://hdl.handle.net/11427/18784.

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This investigation evaluates the abrasive-corrosive wear behaviour of aluminium alloys with the aim of establishing a data base of performance and guide lines for material optimisation. Wear test apparatus and standard tests developed by previous research programmes were utilised (Noel and Allen, 1981; Barker, 1988). Further tests were then devised for a more detailed characterisation of wear behaviour. Tests conducted showed that aluminium alloys have approximately a quarter to half the abrasion resistance of mild steel. Poor microfracture properties of Al-Si cast alloys were observed as a re

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10

Fordyce, E. P. "The unlubricated sliding wear behaviour of austempered ductile irons." Master's thesis, University of Cape Town, 1989. http://hdl.handle.net/11427/21955.

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Bibliography: pages 85-89.<br>A study has been made of the unlubricated sliding wear behaviour of austempered ductile irons under conditions of sliding velocity and load. The load was varied between 0.9 and 2.8 MPa, whilst the sliding velocity range was between 0.5 and 2.0 ms⁻¹. Two commercial grades of spheroidal graphite irons, SG42 and SG60 were austempered between 250⁰C and 400⁰C. A distinction in the wear behaviour was found with metallic type wear dominating at the lower sliding velocities and an oxidative type wear being evident at the higher sliding velocities. It was however found tha

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11

Kim, Kyungmok. "The investigation of fretting wear and fretting fatigue of coated systems." Thesis, University of Oxford, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.432361.

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12

Madge, Jason John. "Numerical modelling of the effect of fretting wear on fretting fatigue." Thesis, University of Nottingham, 2009. http://eprints.nottingham.ac.uk/10681/.

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This thesis reports the development of a method for predicting the fretting fatigue life of a system which takes into consideration the material removed as a result of fretting wear. The first implementation is based on a critical plane, multiaxial fatigue model and a damage accumulation framework. The model is applied to both ‘cylinder on flat’ and ‘rounded edge punch on flat’ geometries, for which experimental data from the literature is used for comparison. The method is able to predict a number of key experimentally observed phenomena, which existing approaches are unable to do. The depend

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13

Tyfour, Wa'il Radwan Ali. "Interaction between wear and rolling contact fatigue in pearlitic rail steels." Thesis, University of Leicester, 1995. http://hdl.handle.net/2381/34715.

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The work presented in this thesis is aimed at investigating the interaction between wear and rolling contact fatigue, which are two of the most serious forms of deterioration caused by the wheel on rail contact stresses. Wheel-rail contact conditions were simulated by a two disc contact using the LEROS (LEicester university ROlling-Sliding wear testing machine). Investigation of the wear behaviour of BS11 pearlitic rail steel showed that steady state wear behaviour is established after a certain number of rolling-sliding cycles. Contact surface failure by ratchetting (accumulation of unidirect

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14

Hogg, Michael Christopher. "Fretting wear and fatigue in taper junctions of modular orthopaedic implants." Thesis, The University of Sydney, 2015. http://hdl.handle.net/2123/15378.

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Multi-component, or modular, implants have a number of advantages over monoblock implants, but also a number of disadvantages related to micromotion and fretting at the taper interface. Depending on the fretting regime, either fatigue or wear damage may occur, resulting in greatly reduced fatigue lives and the production of metallic wear debris. Current revision rates of hip implants with replaceable necks are double those with fixed necks. To improve the understanding of taper performance and identify factors that can reduce wear and fatigue damage, 3-D finite element modelling of a taper co

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15

Riches, Alison Mary. "Aspects of the wear behaviour of zirconia sliding against silicon carbide." Thesis, University of Surrey, 1999. http://epubs.surrey.ac.uk/843354/.

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The development of a high speed pin-on-disc wear testing rig has been undertaken and it has enabled the wear behaviour of zirconia sliding against silicon carbide to be examined. Sliding wear experiments were conducted for zirconia pins and silicon carbide discs under both water-lubricated and unlubricated conditions. Under water-lubricated conditions, tests at a relative sliding speed of 6 m s-1 showed that wear was geometry dependent and the exact alignment of the pin was crucial. At this speed it was possible, with pins polished in-situ on the rig, to achieve hydrodynamic lubrication (HDL)

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16

Wilson, Andrew David. "Wear and fatigue studies of surface engineered ferrous and non-ferrous aerospace alloys." Thesis, University of Hull, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.264952.

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17

Hu, Qinghua. "Fretting wear and fretting fatigue behaviour of a SiC particle reinforced aluminium alloy." Thesis, University of Nottingham, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326537.

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18

Spangenberg, Ulrich. "Reduction of rolling contact fatigue through the control of the wheel wear shape." Thesis, University of Pretoria, 2017. http://hdl.handle.net/2263/62796.

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Heavy haul railway operations permit the transport of huge volumes at lower cost than other modes of transport. The low cost can only be sustained if the maintenance costs associated with such railway operations are minimised. The maintenance costs are mainly driven by wheel and rail damage in the form of wear and rolling contact fatigue (RCF). Low wear rates in the wheel-rail interface have resulted in an increase in the prevalence of rail RCF, thereby increasing rail maintenance costs. The aim of this study is to develop an approach to reduce rail RCF on South Africa’s iron ore export line b

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19

Kienle, Ulrich F. B. "A laboratory simulation of adhesive wear of high speed reciprocating components in water powered mining equipment." Master's thesis, University of Cape Town, 1989. http://hdl.handle.net/11427/22575.

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Bibliography: pages 117-120.<br>A high-speed reciprocating sliding wear test rig was used to examine the metal on metal surface interactions of materials under consideration for application in water powered stoping equipment. The suitability of this test rig was investigated by implementing a test programme covering self-mated stainless steel and stainless steel-on-bronze couples. These couples were examined under water lubricated conditions in a broad test matrix, covering sinusoidal peak velocities of 1, 5 and 10 m/s; loads of 5, 10 and 20N and surface roughness values ranging from 0.2 to 0.

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20

Müller, Ruan. "Characterising the stress-life response of mechanical formed AISI-1008 steel plate components." Thesis, Nelson Mandela Metropolitan University, 2012. http://hdl.handle.net/10948/d1008102.

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The main purpose of this research project was to determine the fatigue-life behaviour of AISI 1008 sheet steel which has been mechanically formed to a radius of curvature of 120mm and then to correlate the fatigue-life behaviour to that of the parent or “as manufactured” material. During the forming process it was felt important to induce plastic strain through stretch-bending by clamping the sides of a plate sample’s (width) edges in the bending fixture before being bent by a single acting mechanical press. It was determined through actual testing that there was a decrease in fatigue-life whe

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21

Singh, Aparna Ph D. Massachusetts Institute of Technology. "Effect of nano-scale twinning on the fracture, fatigue and wear properties of copper." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/69669.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2011.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 143-154).<br>Grain refinement in materials has been one of the most common strategies for improving the strength of materials. However this comes at the price of reduced ductility, fracture toughness and stable fatigue crack propagation life. It has been shown

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22

Varadarajan, Bhadri Narayanan. "MICROMECHANICS OF DEBOND GROWTH AND INTERFACIAL WEAR UNDER FATIGUE LOADING IN A TRANSPARENT CERAMIC COMPOSITE." University of Cincinnati / OhioLINK, 2000. http://rave.ohiolink.edu/etdc/view?acc_num=ucin975352464.

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23

Hong, Hyun-Soo. "A metallurgical study of the oxidational theory of mild wear in stainless steel and surface modified stainless steel." Diss., Georgia Institute of Technology, 1986. http://hdl.handle.net/1853/19597.

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24

Kubiak, Krzysztof. "Quantification de la fissuration d'un contact soumis à des sollicitations complexes en fretting wear et fretting fatigue." Ecully, Ecole centrale de Lyon, 2006. http://bibli.ec-lyon.fr/exl-doc/TH_T2062_kkubiak.pdf.

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Le but de cette étude est la détermination de la durée de vie en l’amorçage et en propagation d’un acier XC38 (EA1N) utilisé comme matériau pour les essieux-axes de TGV soumis à des sollicitations complexes de fretting fatigue. Cette étude est plus précisément orientée sur la prédiction de l’amorçage des fissures en fonction de charges appliquées et la prédiction de la condition d’arrêt de propagation des fissures. Conformément à cette analyse, l’étude expérimentale se divisera en deux grandes parties : l’une aborde la problématique de la condition d’amorçage alors que l’autre traite des phéno

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25

Araujo, cardoso Raphael. "Études numériques sur la modélisation du fretting fatigue." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLN004/document.

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Ce travail a été entrepris dans le cadre d’une coopération internationale entre l’Université de Brasilia, l’Agence spatiale brésilienne (AEB), l’ENS Paris-Saclay et le groupe SAFRAN. L’objet principal de cette coopération est l’étude du fretting-fatigue, problème de contact associé à des charges de fatigue qui réduisent considérablement la durée de vie des composants en raison de la concentration élevée de contraintes, de l’usure et des conditions de chargement non proportionnelles. En ce qui concerne les coûts de calcul élevés impliqués dans l’évaluation des applications industrielles, l’un d

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26

Shrestha, Sanjay. "Wear behavior of Ti-6Al-4V for Joint Implants manufactured by Electron Beam Melting." Youngstown State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1495471138802038.

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27

Yuen, Dick Kwan Kenneth. "Brake disc life prediction for material evaluation and selection : the application of finite element and fatigue analysis to the prediction of crack initiation in brake discs during operation." Thesis, University of Bradford, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363977.

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28

Reddy, Venkatarami. "Modelling and analysis of rail grinding and lubrication strategies for controlling rolling contact fatigue (RCF) and rail wear." Thesis, Queensland University of Technology, 2004. https://eprints.qut.edu.au/15864/1/Venkatarami_Reddy_Thesis.pdf.

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Rails play a significant role in transport of goods and passengers. In Australia railway transport industry contributes 1.6% of GDP with goods and services worth $AUD 8 billion each year which includes $ AUD 0.5 billion per year in exports (Australasian Railway Authority Inc, 2002). Rail track maintenance plays an important role in reliability and safety. The Office for Research and Experiments (ORE) of the Union International des Chemins de Fer (UIC) has noted that maintenance costs vary directly (60-65 per cent) with change in train speed and axle load. It was also found that the increase

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Reddy, Venkatarami. "Modelling and analysis of rail grinding and lubrication strategies for controlling rolling contact fatigue (RCF) and rail wear." Queensland University of Technology, 2004. http://eprints.qut.edu.au/15864/.

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Rails play a significant role in transport of goods and passengers. In Australia railway transport industry contributes 1.6% of GDP with goods and services worth $AUD 8 billion each year which includes $ AUD 0.5 billion per year in exports (Australasian Railway Authority Inc, 2002). Rail track maintenance plays an important role in reliability and safety. The Office for Research and Experiments (ORE) of the Union International des Chemins de Fer (UIC) has noted that maintenance costs vary directly (60-65 per cent) with change in train speed and axle load. It was also found that the increase

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Athukorala, Asitha Chandimal. "Investigation of wear and ratcheting response of head-hardened Australian rail steel under conditions of rolling contact fatigue." Thesis, Queensland University of Technology, 2016. https://eprints.qut.edu.au/95626/9/Asitha_Athukorala_Thesis.pdf.

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The work in this thesis comprehensively investigates the effects of non-uniform material behaviour exhibited by head-hardened Australian rail steel on ratcheting, wear and rolling-contact fatigue. As a result, this research develops novel approaches to characterising rolling-contact fatigue utilising wear debris and surface replication. Furthermore, calibration of material parameters was conducted to obtain a unified material model to elucidate the non-uniform mechanical behaviour of rail steel. All these methods draw attention to the need to refine track maintenance and re-railing practices r

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Larsson, Jesper. "Wear mark evolution and numerical study of impact stresses in stainless steel flapper valves." Thesis, KTH, Materialvetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-199301.

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Compressors that are used in refrigerators and air conditioners usually have flapper vales made of martensitic stainless steel to control the flow of the refrigerant in the system. During service the flapper valves are affected by both bending and impact fatigue in the very high cycle fatigue (VHCF) range with billions of cycles until failure. Due to the VHCF, it is time consuming and expensive to test the performance of the flapper valves. One approach to improve the valve testing could be to combine traditional sample testing with the finite element method (FEM). In this paper, FEM was used

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Crozatier, Mathilde. "Étude de la durabilité d'un matériau composite bobiné sous chargements sévères." Thesis, Paris, ENSAM, 2017. http://www.theses.fr/2017ENAM0008/document.

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Les matériaux composites sont très étudiés depuis des décennies. En effet, l'alliance entre légèreté et résistance de ces structures entraîne le développement de leur utilisation. Leur caractérisation reste un point essentiel dans la plupart des études.Ce travail s’inscrit dans le projet Sollicitern qui vise à concevoir un camion d’hydrocurage en matériaux composites, financé par un fond unique interministériel. L’objectif est d’étudier la durabilité du matériau composite retenu sous chargements sévères. Elle permettra ainsi d’alimenter les modèles numériques des partenaires industriels afin d

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Mussa, Abdulbaset. "A study on wear characteristics of high strength steels under sliding contact." Licentiate thesis, Karlstads universitet, Institutionen för ingenjörsvetenskap och fysik (from 2013), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-77660.

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In the last decades, significant improvements regarding the design, materials and technology of rock drills have been made. Likewise, in sheet metal forming, forming tools experience very high contact pressures when processing high strength steel sheets. In both applications components operate under extremely tough contact conditions that result in an accelerated component failure. Enhancements on mechanical properties of components material subjected to extreme contact conditions are highly required in order to withstand the application loads and prevent severe wear. The present thesis was fo

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Agudelo, Juan Ignacio Pereira. "Analysis of the microstructure transformation (wel formation) in pearlitic steel used in relevant engineering wear systems." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/3/3151/tde-04092018-131559/.

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In this thesis, the behavior of pearlitic steel was characterized under controlled wear conditions in the laboratory and service conditions in two ore mining stages, comminution and transportation. The thesis consists in three experimental chapters, divided according to the tribosystems analyzed. On all the chapters Electro Microscopy techniques for the microstructural analysis were employed. Scanning Electron Microscopy (SEM), Focused Ion Beam (FIB-SEM), Electron Backscatter Diffraction (EBSD) and Transmission Electron Microscopy (TEM) were used. The first experimental chapter shows the anal

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Hasan, Mushfiq. "Investigation of micropitting and wear in rolling/sliding contacts operating under boundary lubrication conditions." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-87215.

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Kahlin, Magnus. "Fatigue Performance of Additive Manufactured Ti6Al4V in Aerospace Applications." Licentiate thesis, Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-137233.

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Additive Manufacturing (AM) for metals includes is a group of production methodst hat use a layer-by-layer approach to directly manufacture final parts. In recent years, the production rate and material quality of additive manufactured materials have improved rapidly which has gained increased interest from the industry to use AM not only for prototyping, but for serial production. AM offers a greater design freedom, compared to conventional production methods, which allows for parts with new innovative design. This is very attractive to the aerospace industry, in which parts could be designed

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Gu, Chongjie. "Modeling of two-body fatigue wear of cylinder liner in internal combustion engines during the break-in period and its impact on engine lubrication." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/111760.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2017.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 104-108).<br>Internal combustion engines are widely utilized in modem automobiles. Around 10% of the total fuel energy is dissipated to heat due to mechanical friction, among which 20% is caused by the contact between the cylinder liner and the piston rings. The wear of cylinder liner not only leads to surface damage, but also results in the change of liner lubrication conditions. Therefore, a large number of tes

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Gu, Chongjie. "Modeling of two-body fatigue wear of cylinder liner in internal combustion engines during the break-in period and its impact on engine lubrication." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/111760.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2017.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 104-108).<br>Internal combustion engines are widely utilized in modem automobiles. Around 10% of the total fuel energy is dissipated to heat due to mechanical friction, among which 20% is caused by the contact between the cylinder liner and the piston rings. The wear of cylinder liner not only leads to surface damage, but also results in the change of liner lubrication conditions. Therefore, a large number of tes

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Solano, Alvarez Wilberth. "Microstructural degradation of bearing steels." Thesis, University of Cambridge, 2015. https://www.repository.cam.ac.uk/handle/1810/249201.

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The aim of the work presented in this thesis is to clarify one of the most fundamental aspects of fatigue damage in bearings steels through critical experiments, in particular whether damage in the form of cracks precedes hard “white-etching matter" formation, which is carbon supersaturated nanoscaled ferrite. Heat treatments have been designed to create four different crack types and distributions: scarce martensite plate cracks, fine grain boundary cracks, abundant martensite plate cracks, and surface cracks. Subsequent rolling contact fatigue experiments showed that the amount of hard white

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Silva, Paula Fernanda da. "Desgaste e fadiga térmica de ligas \'aço matriz + NbC\'." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-13032007-170403/.

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Utilizou-se o conceito de ?aço matriz + NbC? para produzir ligas com a matriz do aço rápido M2 ( 0,5%C ? 2%W ? 3%Mo ? 4,6%Cr ? 1%V) e variadas frações volumétricas de carbonetos de nióbio. Adicionou-se 2,5 e 5% de nióbio e carbono estequiométrico para a obtenção de carbonetos NbC e titânio (0,1%) para modificação da morfologia dos carbonetos NbC. Os carbonetos NbC apresentaram-se como carbonetos eutéticos com morfologia de escrita chinesa, como carbonetos primários com a morfologia de cruz de malta e como carbonetos eutéticos e primários com morfologia poligonal, estes últimos modificados com

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Fernandes, Frederico Augusto Pires. "Produção e caracterização de camadas nitretadas e nitrocementadas por plasma nos aços UNS S31603, S31254 e S41425." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/88/88131/tde-14032012-122709/.

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A produção de superfícies funcionais sobre componentes, para a obtenção de melhores resistências ao desgaste, à corrosão e à fadiga constitui-se num persistente desafio tecnológico. Os processos termoquímicos de nitretação e nitrocementação por plasma são técnicas de engenharia de superfície usadas para aumentar a dureza superficial e resistência ao desgaste de aços inoxidáveis, sem deteriorar suas resistências à corrosão. O presente trabalho teve como objetivo a avaliação da influência das temperaturas de nitretação e nitrocementação por plasma na estrutura das camadas produzidas nos aços ino

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Ferré, Romain. "Etude expérimentale et modélisation de la durabilité d'un contact représentatif de l'interface aube / disque de soufflante grenaillé soumis à des chargements de fretting / fatigue / usure." Thesis, Ecully, Ecole centrale de Lyon, 2013. http://www.theses.fr/2013ECDL0012.

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Ce travail porte sur l’étude du risque d’amorçage de fissure en fretting/fatigue du contact aubes/disque de soufflante en alliage de titane Ti-6Al-4V d’un turboréacteur civil. De part les vibrations du moteur et le passage du flux d’air, le contact aube/disque est sujet à de microdéplacements: le fretting. Ce problème complexe concerne des zones en contact de faibles dimensions subissant des pressions de contact importantes et des micro-déplacements associées à des structures soumises à des chargements eux-mêmes complexes. Des essais de fretting simple, fretting précontraint et fretting fatigu

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Chemkhi, Mahdi. "Nanocristallisation superficielle couplée à la nitruration plasma pour augmenter les propriétés de fatigue et d’usure d’alliages métalliques." Thesis, Troyes, 2014. http://www.theses.fr/2014TROY0038/document.

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Le couplage des traitements de surface mécaniques et thermochimiques a fait l’objet de nombreuses études ces dernières années. L’objectif d’un tel couplage est l’amélioration des cinétiques de diffusion d’espèces chimiques résultant en une augmentation des profondeurs de diffusion, et/ou une diminution de la température du traitement thermochimique sur les matériaux prétraités mécaniquement. Dans cette thèse, le procédé SMAT (Surface Mechanical Attrition Treatment) de nanocristallisation superficiel par déformation plastique sévère a été combiné avec la nitruration plasma sur un acier inoxydab

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Forsström, William. "Utredning av frekvensregleringens påverkan på mekanisk utrustning i en kaplanturbin." Thesis, Uppsala universitet, Elektricitetslära, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-247261.

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As a consequence of increasing wind power installations in the Nordic grid the last years, the need for regulating power has become larger. In the Nordic grid, regulating power is mainly provided by hydro power. One part of the regulating power is called frequency control, which ensures that the grid frequency is stable and close to 50 Hz. However, setting the turbine into frequency controlled operation may cause stress and wear of the components in the mechanical control system. Frequency controlling implies large and frequent servo forces and longer travelling distance of the sliding bearing

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Wang, Yu. "Mechanical properties and microstructure of laser sintered and starch consolidated iron-based powders." Doctoral thesis, Karlstad : Faculty of Technology and Science, Materials Engineering, Karlstads universitet, 2008. http://www.diva-portal.org/kau/abstract.xsql?dbid=1593.

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Rec, Matouš. "Návrh testovacího stavu pro stanovení opotřebení u kontaktu železničního kola a kolejnice." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-445166.

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This diploma thesis focuses on the issue of a wear of a railway wheel and a rail. The wear of the components depends on a number of parameters including the contact stress, the contact pressure and the contact surface dimensions. Among the factors determining these parameters belongs primarily the wheel driving gauge, the rail profile and the load of the contact area. Furthermore, the material from which the wheels and rail are made, the roughness and hardness of the functional surfaces and the residual stress in the material have a significant impact on the wear. All the parameters mentioned

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Fayolle, Caroline. "Influence de la dispersion de la silice sur les propriétés viscoélastiques et mécaniques des élastomères renforcés." Thesis, Lyon 1, 2015. http://www.theses.fr/2015LYO10059/document.

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L'objectif de ce travail est d'étudier l'influence de l'état de dispersion de la silice sur les propriétés viscoélastiques et mécaniques des élastomères chargés silice pour l'application pneumatique. En effet, il est montré qu'une grande partie de la résistance au roulement dépend de la dissipation d'énergie de l'élastomère chargé. De plus, les propriétés mécaniques pourraient intervenir dans les propriétés ultimes telles la propagation de fissure en fatigue et l'usure : l'étude de ces différentes propriétés est donc primordiale. La première partie s'attèle donc à l'identification des leviers

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Mohammadi, Ramona. "Verifieringsmetod för flexibla avgasledande element - Felmodsanalys." Thesis, KTH, Maskinkonstruktion (Inst.), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-192488.

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Detta examensarbete utfördes på Scania CV AB och behandlar delar i lastbilens avgassystem som utsätts för korrosion och nötning. Huvudmålet med detta arbete är att utveckla en provmetod för livslängdsundersökning av flexibla slangar. En serie tester utfördes för att förstå grundorsakerna till brott och en FE-analys utfördes för att verifiera resultaten till dessa prov. En stor del av den flexibla slangen blir stel på grund av höga avgastemperaturer och som leder till plastisk deformation av slangen. Men de tre första lindningarna som ligger närmast motorn behåller sin flexibilitet på grund av

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Lidholm, Oskar, and Daniel Lundgren. "Metodik för identifiering av T-stycke med risk för termisk utmattning." Thesis, Uppsala universitet, Institutionen för fysik och astronomi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-227433.

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Thermal fatigue is a serious problem in todays power plants. A large amount of damages around the world circles around that subject. The damage can come from the mechanism of two flows mixing with different temperatures in a T-junction. It is a fundamental prerequisite that these T-junctions are frequently tested for damages. An amount of criterias steers the rate of testings. This guide/document will provide the process of rating the T-junctions resistance with valid information and ease the course. If a T-junction is stated as very sensetive for thermal fatigue, it will be graded with a low

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Al-Haddad, Ala'A. "Characterisation and performance of fibre-reinforced composite restorations." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/characterisation-and-performance-of-fibrereinforced-composite-restorations(bdcc1685-a341-4b8a-9e4a-542467f4b321).html.

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In the modern era of metal-free minimally-invasive dentistry, there is a growing tendency toward using metal-free restorative alternatives that provide not only excellent aesthetics but also enable superior durability. Fibre-reinforced composite (FRC) is one cost-effective alternative that fulfils the requirements of aesthetics and durability, and offers favourable physico-mechanical properties. Many FRC applications are well-documented in the literature, such as crowns and fixed partial dentures (FPD); however, their clinical implementation is still limited, owing to the lack of significant k

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