Thematische Bibliographien / Fatigue wear

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Auswahl der wissenschaftlichen Literatur zum Thema „Fatigue wear“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 3. Februar 2022

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Zeitschriftenartikel zum Thema "Fatigue wear"

Miyoshi, Dr Kazuhisa. „Fretting fatigue and wear“. Tribology International 36, Nr. 2 (Februar 2003): 69. http://dx.doi.org/10.1016/s0301-679x(02)00133-0.

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Goryacheva, I. G., F. I. Stepanov und E. V. Torskaya. „Fatigue Wear Modeling of Elastomers“. Physical Mesomechanics 22, Nr. 1 (Januar 2019): 65–72. http://dx.doi.org/10.1134/s1029959919010107.

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Berthier, Y., L. Vincent und M. Godet. „Fretting fatigue and fretting wear“. Tribology International 22, Nr. 4 (August 1989): 235–42. http://dx.doi.org/10.1016/0301-679x(89)90081-9.

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Kimura, Yoshitsugu, Masami Sekizawa und Akio Nitanai. „Wear and fatigue in rolling contact“. Wear 253, Nr. 1-2 (Juli 2002): 9–16. http://dx.doi.org/10.1016/s0043-1648(02)00077-7.

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HATTORI, Toshio. „Fretting Fatigue Analysis Considering Wear Process“. Proceedings of the JSME annual meeting 2004.1 (2004): 537–38. http://dx.doi.org/10.1299/jsmemecjo.2004.1.0_537.

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Furue, Harumi. „Durability (creep, stress relaxation, fatigue, wear).“ Kobunshi 35, Nr. 7 (1986): 654–57. http://dx.doi.org/10.1295/kobunshi.35.654.

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Karmakar, S., U. R. K. Rao und A. Sethuramiah. „An approach towards fatigue wear modelling“. Wear 198, Nr. 1-2 (Oktober 1996): 242–50. http://dx.doi.org/10.1016/0043-1648(96)06984-0.

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Reid, C. N., J. Fisher und P. H. Jacobsen. „Fatigue and wear of dental materials“. Journal of Dentistry 18, Nr. 4 (August 1990): 209–15. http://dx.doi.org/10.1016/0300-5712(90)90114-t.

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Omar, M. K., A. G. Atkins und J. K. Lancaster. „The adhesive-fatigue wear of metals“. Wear 107, Nr. 3 (Februar 1986): 279–85. http://dx.doi.org/10.1016/0043-1648(86)90230-9.

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Hejwowski, Tadeusz, und Mirosław Szala. „Wear-Fatigue Study of Carbon Steels“. Advances in Science and Technology Research Journal 15, Nr. 3 (01.09.2021): 179–90. http://dx.doi.org/10.12913/22998624/140200.

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Dissertationen zum Thema "Fatigue wear"

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 engine components. In order to do this, a survey of the internal Rolls-Royce database and public literature on wear damage on components from ex-service and current service engines was performed. Information relating to the wear scar morphologies in the reports was extracted as well as physically measuring and analysing wear damage on worn components within the Rolls- Royce failure investigation department. The wear damage was then replicated onto Udimet720Li laboratory fatigue specimens by a means of altering the pad pressure and pad sliding distance to produce a range of wear damage in order to carry out fatigue testing. Fatigue testing of the damaged specimens allowed fatigue knockdown factors to be calculated to determine the impact of wear on the fatigue life. A fretting fatigue rig was also designed and built for this research to focus on in-situ fretting fatigue at high temperatures of 600°C.

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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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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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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 grinding of, respectively, the wheels and rails. This can be used because a competition exists between wear and surface initiated RCF: At a high wear rate, RCF does not have the opportunity to develop further. Initiated cracks are in this case worn off and will not be able to propagate deep beneath the surface of the rail or wheel. When wheel-rail damage in terms of wear and RCF can be predicted, measures can be taken to decrease it. For example, the combination of wheel and rail profiles, or the combination of vehicle and track, can be optimised to control the damage. Not only can this lead to lower maintenance costs, but also to a safer system since high potential risks can be detected in advance. This thesis describes the development of a wheel-rail life prediction tool with regard to both wear and surface-initiated RCF. The main goal of this PhD work was to develop such a tool where vehicle-track dynamics simulations are implemented. This way, many different wheel-rail contact conditions which a wheel or a rail will encounter in reality can be taken into account. The wear prediction part of the tool had already been successfully developed by others to be used in combination with multibody simulations. The crack prediction part, however, was more difficult to be used in combination with multibody simulations since crack propagation models are time-consuming. Therefore, more concessions had to be made in the crack propagation part of the tool, since time-consuming detailed modelling of the crack, for example in Finite Elements models, was not an option. The use of simple and fast, but less accurate, crack propagation models is the first step in the development of a wheel-rail life prediction model. Another goal of this work was to verify the wheel-rail prediction tool against measurements of profile and crack development. For this purpose, the wheel profiles of trains running on the Stockholm commuter network have been measured together with the crack development on these wheels. Three train units were selected and their wheels have been measured over a period of more than a year. The maximum running distance for these wheels was 230,000 km. A chosen fatigue model was calibrated against crack and wear measurements of rails to determine two unknown parameters. The verification of the prediction tool against the wheel measurements, however, showed that one of the calibrated parameters was not valid to predict RCF on wheels. It could be concluded that wheels experience relatively less RCF damage than rails. Once the two parameters were calibrated against the wheel measurements, the prediction tool showed promising results for predicting both wear and RCF and their trade-off. The predicted position of the damage on the tread of the wheel also agreed well with the position found in the measurements.

QC 20150526

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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 in the presence of the magnetic field. For the generation of the finer wear particles, it is considered necessary that the subsurface crack initiation point is moved towards the surface due to the magnetic field. Wear amounts of the discs are lowered III the magnetic fields under the pure rolling conditions. However, at 100/0 rolling with sliding, the wear amounts are increased in the magnetic fields even though finer particles and smoother surfaces are observed. Both tendencies are unified by calculating the number of cycles required to generate wear particles, which are reduced due to the magnetic field's presence. For these mechanisms, it is considered that domain walls near the contact region are caught by dislocations when the specimen is agnetised and part of the energy for magnetisation activates the dislocation movement resulting in crack initiation.

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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 ausferritic (carbide free bainitic) steels have been investigated. The dry rolling-sliding tribological behavior of 60SiCr7 steel, with 1.65% of Si was investigated in austempered conditions. The obtained ausferritic microstructure contained laths in the sub-micron range. It was found that the retained austenite content decreased and the hardness increased with lower austempering temperatures, and these changes resulted in decreasing the wear rate.The wear behavior of nano-structured ausferritic steels was investigated using the same rolling-sliding conditions as the previous study. If steels of the same hardness are compared, the wear rate was reduced by half in nano-structured steels in relation with the results obtained previously for the 60SiCr7 steel. Initial hardness was an important property in reducing rolling-sliding wear. Surface hardness after wear was inversely proportional to the wear rate. It was found that the increased plasticity obtained from the transformation of retained austenite into martensite (TRIP effect), present in these steels can be beneficial for the wear resistance.The effect of austempering 55Si7 spring steel on its fatigue strength was also investigated. Three heat treatments were done, isothermal transformation at 300 and 350°C respectively and quenching and tempering at 460°C. The samples were tested in rotating-bending fatigue. It was found that by austempering at 300°C the endurance limit was improved by approximately 25% in comparison with the other two heat treatments. The improved fatigue life was mainly due to the carbide-free microstructure. The transformation of austenite into martensite improves fatigue strength, but this depends on the stability of the retained austenite. With the current work some insight has been gained on the behavior of carbide-free bainitic steels in wear and fatigue. The future work will include high resolution techniques in order to further investigate in-depth both the wear and fatigue mechanisms. In addition, other wear modes will be investigated, particularly pure sliding.

Godkänd; 2012; 20120521 (andbra); LICENTIATSEMINARIUM Ämnesområde: Konstruktionsmaterial/Engineering Materials Examinator: Professor Braham Prakash, Institutionen för teknikvetenskap och matematik, Luleå tekniska universitet Diskutant: PhD Peter Hedström, Kungliga Tekniska högskolan, Stockholm Tid: Onsdag den 20 juni 2012 kl 14.30 Plats: E231, Luleå tekniska universitet

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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.
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 of application. To optimise materials selection, a family of tungsten carbide-cobalt cermets together with a number of structural ceramics were tested in situ. The modes of wear can be related to material constitution. By ranking the performance of these candidate materials, value based materials selection and design for use can be applied.

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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.
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 that an increase in the load resulted in an earlier onset of the oxidative type wear regime, for a specific sliding velocity. On austempering these spheroidal graphite irons the mechanical properties as well as the sliding wear resistance increased dramatically. Furthermore, the austempered irons' outperformed a series of steels of much higher hardness by factors between 2 and 28 times under the same conditions. At the lower velocity of testing the outstanding wear resistance is attributed to the austempered iron's unique microstructure of acicular ferrite and retained austenite and a partial transformation of austenite to martensite. However, at the higher sliding velocity the exceptional wear resistance is derived from a development of an tribologically protective oxide film together with the formation of a hardened white layer. The development of the work hardened layer is linked to the high carbon in the matrix of these irons. The work hardened layer leads to a similar wear rate prevailing for all irons austempered from a specific parent iron. The synergism of variation in load, sliding velocity and wear counterface together with the effect of initial microstructure has been explain in terms of simple wear models.

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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 result of coarse and brittle silicon rich phases contained in the aluminium matrix. Non heat-treatable wrought alloys exhibit ductile micro-deformation characteristics whilst heat-treatable alloys, having the best abrasion resistance, possess better combinations of strength, hardness and toughness. Tests with combined corrosion and wear showed that most aluminium alloys are subject to pitting corrosion due to localised differences in electrode potentials at constituent sites. Higher series alloys with a large number of constituent particles exhibit higher pitting densities. Due to the high electrode potentials of silicon phases and copper and zinc solid solutions, the alloys LM6+Sr, 2014 and 7075 have poor corrosion resistance and are subject to localised and pitting attack. As a consequence the alloys 2014, 7075 and LM6+Sr show a decrease in wear performance under abrasive-corrosive conditions. In contrast the good corrosion resistance of the alloys 5083, 6261 and 7017 provide a significant improvement in wear performance under conditions of long corrosion periods with light abrasive intervals. This study concludes that the abrasion resistance of wrought alloys may be optimised by designing an alloy with a good combination of tensile strength, fracture toughness and hardness together with an intermediate microstructural size distribution of second phase particles in the aluminium matrix. Ageing of heat treatable alloys improves abrasion resistance significantly, peak hardness and strength conditions resulting in optimum abrasion properties.

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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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Bücher zum Thema "Fatigue wear"

Tribo-fatigue: Wear-fatigue damage and its prediction. Berlin: Springer, 2005.

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Sosnovskiĭ, L. A. Surprises of Tribo-fatigue. Minsk: Magic Book, 2009.

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Salem, Jonathan, Edwin R. Fuller, Tatsuki Ohji und Andrew Wereszczak, Hrsg. Corrosion, Wear, Fatigue, and Reliability of Ceramics. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2008. http://dx.doi.org/10.1002/9780470456347.

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International Conference on Wear of Materials (13th 2001 Vancouver, B.C.). Wear of materials. Herausgegeben von Rigney David A und Bayer R. G. 1935-. Amsterdam: Elsevier, 2001.

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Abdel Wahab, Magd, Hrsg. Proceedings of the 7th International Conference on Fracture Fatigue and Wear. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-0411-8.

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Abdel Wahab, Magd, Hrsg. Proceedings of the 8th International Conference on Fracture, Fatigue and Wear. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-9893-7.

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Miyoshi, Kazuhisa. Preliminary study on fatigue strengths of fretted Ti-48Al-2Cr-2Nb. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 2002.

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Miyoshi, Kazuhisa. Preliminary study on fatigue strengths of fretted Ti-48Al-2Cr-2Nb. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 2002.

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International Symposium on Corrosion and Wear of Metals (1997 Sudbury, Ont.). Corrosion and wear of metals: Proceedings of the International Symposium on Corrosion and Wear of Metals, Sudbury, Ontario, Canada, August 17-20, 1997. Herausgegeben von Elboujdaïni M. 1953-, Lai G. Y, Sastri V. S und Conference of Metallurgists (36th : 1997 : Sudbury, Ontario). [Montreal]: Metallurgical Society of CIM = Société de la métallurgie de l'ICM, 1997.

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C-MRS International Conference (1990 Beijing, China). Mechanical properties materials design: Proceedings of the symposia J, Fatigue and fracture behavior in materials, K, Recent advances of tribomaterials, and M, Microstructures and materials design of the C-MRS International 1990 Conference, Beijing, China, 18-22 June 1990. Herausgegeben von Wu Boqun und Chinese Materials Research Society. Amsterdam: North-Holland, 1991.

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Buchteile zum Thema "Fatigue wear"

Gleß, M., V. Fafoutis, G. Repphun, C. G. Provatidis, D. Bartel und L. Deters. „Fatigue Life in Rolling Contacts with Rough Surfaces“. In Friction, Wear and Wear Protection, 473–78. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527628513.ch60.

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Gold, P. W., T. Wolf und M. Plogmann. „Effects of PVD-coatings on Fatigue of Roller Bearings“. In Friction, Wear and Wear Protection, 568–74. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527628513.ch73.

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Eiss, N. S., und J. R. Potter. „Fatigue Wear of Polymers“. In Polymer Wear and Its Control, 59–66. Washington, D.C.: American Chemical Society, 1985. http://dx.doi.org/10.1021/bk-1985-0287.ch004.

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Sosnovskiy, Leonid A. „Active Systems. Wear-Fatigue Damage“. In Foundations of Engineering Mechanics, 119–86. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/978-3-540-27027-0_2.

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Sosnovskiy, Leonid A. „Methods of Wear-Fatigue Tests“. In Foundations of Engineering Mechanics, 187–212. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/978-3-540-27027-0_3.

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Schalk, Thomas, Karl-Heinz Lang und Detlef Löhe. „Fretting Fatigue of Engineering Ceramics“. In Corrosion, Wear, Fatigue, and Reliability of Ceramics, 101–10. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2009. http://dx.doi.org/10.1002/9780470456347.ch11.

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Tallian, Tibor E. „Profilometric Roughness and Contact Fatigue“. In Approaches to Modeling of Friction and Wear, 152–54. New York, NY: Springer New York, 1988. http://dx.doi.org/10.1007/978-1-4612-3814-0_24.

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Chow, T. S. „A Fatigue-Abrasive Wear Mechanism for Polymeric Surfaces“. In Polymer Wear and Its Control, 67–74. Washington, D.C.: American Chemical Society, 1985. http://dx.doi.org/10.1021/bk-1985-0287.ch005.

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Dubensky, Ellen, Robert Newman, Aleksander J. Pyzik und Amy Wetzel. „Friction and Wear Behavior of AIBC Composites“. In Corrosion, Wear, Fatigue, and Reliability of Ceramics, 117–29. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2009. http://dx.doi.org/10.1002/9780470456347.ch13.

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Lewinsohn, C. A., H. Anderson, M. Wilson, T. Lillo und A. Johnson. „Corrosion Resistance of Ceramics in Vaporous and Boiling Sulfuric Acid“. In Corrosion, Wear, Fatigue, and Reliability of Ceramics, 1–10. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2009. http://dx.doi.org/10.1002/9780470456347.ch1.

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Konferenzberichte zum Thema "Fatigue wear"

Lin, Zhen. „Abrasive Wear and Fatigue Wear“. In 2016 2nd Workshop on Advanced Research and Technology in Industry Applications (WARTIA-16). Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/wartia-16.2016.238.

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Lunev, A. G., M. V. Nadezhkin, A. V. Bochkareva, S. V. Kolosov und L. B. Zuev. „Ultrasonic criteria of carbon steel fatigue wear“. In MECHANICS, RESOURCE AND DIAGNOSTICS OF MATERIALS AND STRUCTURES (MRDMS-2018): Proceedings of the 12th International Conference on Mechanics, Resource and Diagnostics of Materials and Structures. Author(s), 2018. http://dx.doi.org/10.1063/1.5084396.

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Li, W., und Y. B. Guo. „Residual Stress and Fatigue Properties of AISI H13 Steel by Sustainable Dry Milling“. In ASME 2012 International Manufacturing Science and Engineering Conference collocated with the 40th North American Manufacturing Research Conference and in participation with the International Conference on Tribology Materials and Processing. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/msec2012-7363.

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Dry machining is a cluster of sustainable manufacturing processes to eliminate the negative environmental effect of machining coolants. It is critical to ensure that product quality cannot be sacrificed for achieving sustainability. The progress of tool flank wear during hard milling adversely affects surface integrity and, therefore, fatigue life of machined components. This paper focuses on the influence of tool flank wear on residual stress and fatigue properties in dry end milling AISI H13 tool steel (50 ± 1 HRC) using PVD coated tools. The effects of flank wear (VB = 0, 0.1, and 0.2 mm) on residual stresses at three different feeds were studied. Four-point bending fatigue tests were performed on the samples machined at five levels of tool flank wears (VB = 0, 0.05, 0.10, 0.15, 0.20 mm) and surface fatigue initiations of the fatigued samples were identified by the fractographic method.

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Chen, Cheng-Yo, und Steve A. Will. „Design of the Baldpate Tower for Fatigue and Wear“. In Offshore Technology Conference. Offshore Technology Conference, 1999. http://dx.doi.org/10.4043/10917-ms.

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Christiner, Thomas, Wilfried Eichlseder, Istvan Gódor, Johannes Reiser, Franz Trieb und René Stuehlinger. „Fretting Fatigue and Wear: Experimental Investigations and Numerical Simulation“. In SAE 2011 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2011. http://dx.doi.org/10.4271/2011-01-0199.

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Gemilang, Gilang M., Philippa A. S. Reed und Adam J. Sobey. „Fatigue Approaches for Mooring Chains Subjected to Wear Degradation“. In ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/omae2019-96386.

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Abstract There are currently 365 FPSOs in service around the world. These vessels all use mooring lines to maintain position and provide stability, keeping the vessel and cargo safe. However, more than 21 failures have occurred between 2001 and 2011 and approximately 50% of the reported failures occurred in the first 3 years of 20-year design life. Each mooring line failure represents the potential for serious environmental and economic consequences. Based on industry surveys, the most common failure mode is fatigue failure. In the current offshore standards, the surface degradation due to wear and corrosion is modelled as a diameter loss at a standards rate. To assess whether the uniform reduction in chain diameter suggested in the offshore standards is able to explain the early chain failures seen in service, this paper incorporates two wear rates into a fatigue life calculation; one wear rate is taken from DNV-OS-E301 and is compared against one taken from NORSOK M-001. Three fatigue life estimation approaches: tension, nominal stress and hotspot, are used to compare the differences in fatigue method. The stress in the chain is calculated using an analytical model, which is verified against an FE model. The effect of wear degradation on the ultimate strength of the chain is calculated based on the minimum breaking load. The results show that the diameter loss rates suggested in the offshore standards are not able to explain the early mooring chain failures seen in the past and that the reduction of diameter cannot solely explain the early failures seen in service. The hotspot approach, not often used in mooring line predictions, is best able to predict these shorter lives, as it offers more accurate fatigue predictions by considering high peak stresses compared to standard methods such as tension and nominal stress approaches.

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Ayers, Ray R., und Saltuk B. Aksu. „Cyclic fatigue and wear in deepwater polyester mooring systems“. In OCEANS 2009. IEEE, 2009. http://dx.doi.org/10.23919/oceans.2009.5422303.

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Yan, Yu-Tao, Yuan-Jun Xu und Xiao-Lin Qian. „Analysis of Influencing Factors for Sliding Wear-Fatigue Damage Interaction“. In 2015 International Conference on Material Science and Applications (icmsa-15). Paris, France: Atlantis Press, 2015. http://dx.doi.org/10.2991/icmsa-15.2015.6.

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Lucek, John W. „Rolling Wear of Silicon Nitride Bearing Materials“. In ASME 1990 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1990. http://dx.doi.org/10.1115/90-gt-165.

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Rolling-contact fatigue test methods were used to measure the wear performance of several silicon nitride materials. Sintered, hot pressed and hot isostatically pressed materials exhibited wear rates ranging over three orders of magnitude. Hot isostatically pressed materials had the lowest wear rates. Despite the disparity in wear performance, all materials tested had useful rolling-contact fatigue lives compared to steel. Fatigue life estimates, failure modes, and rolling wear performance for theses ceramics are compared to M-50 steel. This work highlights the rapid contact stress reductions that occur due to conformal wear in rolling-contact fatigue testing. Candidate bearing materials with unacceptably high wear rates may exhibit useful fatigue lives. Rolling contact bearing materials must possess useful wear and fatigue resistance. Proper performance screening of candidate bearing materials must describe the failure mode, wear rate, and the fatigue life. Guidelines for fatigue testing methods are proposed.

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Greene, Rawley B., und Jamie J. Kruzic. „Fatigue Behavior, Bridging Stresses, and Fatigue Reliability in Silicon Nitride Ceramics“. In ASME 2011 International Manufacturing Science and Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/msec2011-50056.

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Silicon nitride ceramics doped with rare-earth oxides exhibit excellent hardness, toughness, and strength at elevated temperatures making them attractive materials for replacing cemented carbides in a variety of manufacturing applications such as cutting and rolling tools. One recent example is the application of rolling of high strength alloy wires from steels and nickel-based super-alloys where cemented carbide rolls suffer wear and thermal fatigue cracking, leading to a degradation of wire quality. [1] Furthermore, it has been shown that under moderate loading silicon nitride rolls can give >10 times longer life and improved wire surface quality. [1] However, it has also been shown that the rolls can suffer fatigue failure at higher loadings, for example when rolling wires with high deformation resistance such as the super alloy wire Nicrofer S7020. [1–2] Accordingly the aim of this study is the develop a design tool for predicting the fatigue failure of silicon nitride ceramics. The silicon nitrides with favorable mechanical properties have microstructures with elongated β-phase grains and a glassy intergranular film. The weak film encourages intergranular fracture allowing the formation of grain bridges across the crack wake which helps to reduce the stress intensity felt at the crack tip, Ktip. [3]

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Berichte der Organisationen zum Thema "Fatigue wear"

Donovan, James A. Fatigue, Fracture and Wear Properties of Rubber. Fort Belvoir, VA: Defense Technical Information Center, Januar 1989. http://dx.doi.org/10.21236/ada204743.

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Bogdanoff, John L., und Frank Kozin. B-Model Approach to Fatigue, Fatigue Crack Growth, and Wear for Durability Assessment. Fort Belvoir, VA: Defense Technical Information Center, Juli 1985. http://dx.doi.org/10.21236/ada171851.

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Alsem, Daniel Henricus. Mechanisms for fatigue and wear of polysilicon structural thinfilms. Office of Scientific and Technical Information (OSTI), Januar 2006. http://dx.doi.org/10.2172/910596.

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Atela, Martin, Atela, Martin, Ojebode, Ayobami Ojebode, Ayobami, Aina, Omotade Aina, Omotade und Agbonifo, John Agbonifo, John. Demanding Power: Struggles over Fuel Access in Nigeria. Institute of Development Studies (IDS), August 2021. http://dx.doi.org/10.19088/ids.2021.054.

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Why do some fuel protests in Nigeria lead to a response from government, but others are barely noticed? What are the politics behind government response and who are the winners and losers? Using a multi-method approach, this study focuses on the period between 2007 and 2017 to investigate the dynamics of fuel protest in Nigeria to ask how, and under which conditions, struggles over energy access in Nigeria produce accountability and empowerment. The findings suggest that accountability and empowerment outcomes of the struggles over fuel access in Nigeria are severely limited by the very conditions that define the state as fragile: weak institutions, elite capture, widespread corruption, and a citizenry that is protest-fatigued and disempowered. This could be true of other fragile and conflict-affected settings. Therefore, frameworks that open up the civic space for dialogues between the government and citizens may produce better outcomes than protests.

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