Дисертації з теми "Fire Loading"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся з топ-50 дисертацій для дослідження на тему "Fire Loading".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Переглядайте дисертації для різних дисциплін та оформлюйте правильно вашу бібліографію.
Pirzadeh, Davoud [Verfasser]. "Analysis of framed structures under fire loading / Davoud Pirzadeh." Wuppertal : Universitätsbibliothek Wuppertal, 2019. http://d-nb.info/1190649608/34.
Повний текст джерелаJeffers, Ann E. "A Fiber-Based Approach for Modeling Beam-Columns under Fire Loading." Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/38692.
Повний текст джерелаPh. D.
Fogle, Emily Johanna. "Compression Failure of Aluminum Plates Exposed to Constant Heat Flux." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/33011.
Повний текст джерелаMaster of Science
Tsolakis, Thomas. "Thermal response analysis of process vessels in the presence of fire loading." Thesis, Imperial College London, 1997. http://hdl.handle.net/10044/1/8858.
Повний текст джерелаAb, Kadir Mariyana Aida. "Fire resistance of earthquake damaged reinforced concrete frames." Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/7969.
Повний текст джерелаArthur, Katherine Marie. "Predicting the Failure of Aluminum Exposed to Simulated Fire and Mechanical Loading Using Finite Element Modeling." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/32670.
Повний текст джерелаMaster of Science
Manu, Christopher Corneliu. "Finite element analysis of stress rupture in pressure vessels exposed to accidental fire loading." Thesis, Kingston, Ont. : [s.n.], 2008. http://hdl.handle.net/1974/1295.
Повний текст джерелаKolaks, Jeremy. "Fuel loading and fire behavior in the Missouri Ozarks of the Central Hardwood Region /." free to MU campus, to others for purchase, 2004. http://wwwlib.umi.com/cr/mo/fullcit?p1420928.
Повний текст джерелаEscobedo, Montoya Francisco Javier 1969. "Fire frequency effects on fuel loading in pine-oak ecosystems of the Madrean Province." Thesis, The University of Arizona, 1998. http://hdl.handle.net/10150/291850.
Повний текст джерелаSummers, Patrick T. "Predicting Compression Failure of Fiber-reinforced Polymer Laminates during Fire." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/32770.
Повний текст джерелаMaster of Science
Miah, Md Jihad. "The effect of compressive loading and cement type on the fire spalling behaviour of concrete." Thesis, Pau, 2017. http://www.theses.fr/2017PAUU3015/document.
Повний текст джерелаThe research presented in this thesis seeks to examine and understand the mechanism of fire spalling role played by the external compressive loading during heating. Concrete cube (200 x 200 x 200 mm3) and slab (800 x 800 x 100 mm3) specimens made with CEM II and CEM III cements (B40-II and B40-III: fc28days ≈ 40 MPa) were exposed to ISO 834-1 fire curve under different levels of external uniaxial (for cube) and biaxial (for slab) compressive stress. Additionally, the effect of external compressive loading (confining pressure and uniaxial load) on the residual gas permeability of concretes have been investigated. In order to better analyse the experimental results and to provide more insight into the mechanism behind the fire spalling behaviour of concrete, numerical computations were carried out by using the existing thermo-mechanical model implemented in a finite element code CAST3M. The experimental results have clearly shown that the loaded specimens (uniaxial and biaxial) are more prone to spalling than unloaded specimens, with increasing amounts of spalling for higher values of applied compressive stress. Part of the tests, but not all have shown that B40-II (3% of slag) exhibited higher spalling than the B40-III (43% of slag).From this study on two ordinary concretes, it highlights that a certain level of external compressive stress (uniaxial or biaxial) was necessary to induce spalling. A possibility is that the applied compressive stress prevents the creation of cracks naturally due to thermal mismatch between cement paste and aggregates and thermal gradients. For unloaded specimen, the creation of cracks increases the permeability and naturally prevents the pore pressure to exceed a value that favours spalling.During a real fire, concrete structural members are always loaded or restrained. The presence of compressive loading during heating significantly increases the compressive stress (decreases the tensile stress) and the magnitude of pore pressure, which increase the risk of fire spalling. Then, the applied compressive stress is a very important key factor that the fire resistance design of concrete structures should take into account when considering spalling. Hence, it is recommended that the fire spalling test should not be carried out only on unloaded specimens, especially for the ordinary concrete
Mansour, Khalid A. "Fires in large atmospheric storage tanks and their effect on adjacent tanks." Thesis, Loughborough University, 2012. https://dspace.lboro.ac.uk/2134/12196.
Повний текст джерелаHammond, Sean LaRoy. "Mapping Fire Fuels Through Detection of Canopy Biomass Loading In Juniper, Sagebrush, and Gambel Oak Communities." DigitalCommons@USU, 2012. https://digitalcommons.usu.edu/etd/1194.
Повний текст джерелаКрутиголова, Богдан Іванович, та Bohdan Krutyholova. "Медичний реабілітаційний цент в місті Одеса з комп’ютерним моделюванням пожежної стійкості". Thesis, Тернопільський національний технічний університет імені Івана Пулюя, 2017. http://elartu.tntu.edu.ua/handle/123456789/19286.
Повний текст джерелаВиконано аналіз та порівняння відомих методів і нормативних документів щодо дослідження вогнестійкості будівельних конструкцій та розроблено проект медичного реабілітаційного центру з врахуванням забезпечення пожежної стійкості. Шляхом комп’ютерної симуляції пожежі одержано розподіл теплового навантаження на об’єкт, концентрації шкідливих газів (CO, CO2), задимленості. Виявлено розподіл температур на поверхні та по товщині несучих елементів конструкції при пожежі, виконано оцінку їх впливу на НДС елементів конструкції.
In this graduation paper the analysis and comparison of the known methods and regulations regarding research of fire resistance of structures were performed. Project of the the medical rehabilitation center was developed taking into account it’s structures fire resistance. Through computer simulations of fire the distributions of heat loadings on the object, concentration of harmful gases (CO, CO2) and smoke were received. Temperature distribution on the surface and the thickness of bearing structural elements during a fire was discovered and the estimation of their influence on the stress-strain state of designed elements was performed.
Boyd, Steven Earl. "Compression Creep Rupture of an E-glass/Vinyl Ester Composite Subjected to Combined Mechanical and Fire Loading Conditions." Diss., Virginia Tech, 2006. http://hdl.handle.net/10919/29896.
Повний текст джерелаPh. D.
Lacković, Luka [Verfasser], and Joško [Akademischer Betreuer] Ožbolt. "Behavior of concrete structures subjected to static and dynamic loading after fire exposure / Luka Lacković ; Betreuer: Joško Ožbolt." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2021. http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-ds-117011.
Повний текст джерелаShakespear, Alan Wyatt. "Fuel Response to Mechanical Mastication of Pinyon-Juniper Woodlands in Utah." BYU ScholarsArchive, 2014. https://scholarsarchive.byu.edu/etd/4317.
Повний текст джерелаGalgamuwe, Arachchige Pabodha Galgamuwa. "Ecological restoration of an oak woodland in Kansas informed with remote sensing of vegetation dynamics." Diss., Kansas State University, 2017. http://hdl.handle.net/2097/38196.
Повний текст джерелаDepartment of Horticulture, Forestry, and Recreation Resources
Charles J. Barden
Recurrent, landscape-level fires played an integral part in the development and persistence of eastern oak (Quercus spp.) forests of the United States. These periodic surface fires helped secure a competitive position for oaks in the regeneration pool by maintaining a desirable species composition and forest structure. This historical fire regime was altered with the European settlement of North America, and fire suppression within forestlands became a standard practice since 1930s. With decades of fire suppression, mature oak-dominated woodlands have widely converted to shade-tolerant tree species. Prescribed fire has successfully been used to enhance oak regeneration in eastern forests. However, oak woodland restoration within the forest-prairie ecotone of the Central plains has not been systematically studied. Fuel beds under shade-tolerant species are often less conducive to fire. Therefore, monitoring fuel loading (FL) and its changes are essential to inform management decisions in an oak regeneration project. Rapid expansion of eastern redcedar (Juniperus virginiana/ERC) is another ecological issue faced by land managers throughout North America’s midcontinent forest-prairie ecotone. Hence, it is worthy to monitor ERC expansion and effects on deciduous forests, to inform oak ecosystem restoration interventions within this region. Therefore, the main objectives of this dissertation were three-fold: (1) understand the effects of prescribed burning and mechanical thinning to encourage oak regeneration; (2) investigate the initial effects of an oak regeneration effort with prescribed fire and mechanical thinning on FL; and (3) monitor the spatio-temporal dynamics of ERC expansion in the forest-prairie ecotone of Kansas, and understand its effects on deciduous forests. The first two studies were conducted on a 90-acre oak dominated woodland, north of Manhattan, Kansas. The experimental design was a 2 (burn) x 2 (thin) factorial in a repeated measures design. The design structure allowed four treatment combinations: burn only (B), thin only (T), burn and thin combined (BT), and a control (C). Burning and thinning treatments were administered in spring 2015. Changes in the FL estimates after the burn treatment revealed that the BT treatment combination consumed more fuel and burned more intensely compared to the B treatment. This observation was reflected in vegetation responses. The thinning reduced the canopy cover significantly, but under enhanced light environments, both oaks and competitive species thrived when no burn was incorporated. In contrast, burn treatments controlled the competitive vegetation. Hence, the most promising results were obtained when both fire and thinning were utilized. The remote sensing study documented the expansion of ERC in three areas of eastern Kansas over 30 years. The use of multi-seasonal layer-stacks with a Support Vector Machines (SVM) supervised classification was found to be the most effective approach to map ERC distribution. Total ERC cover increased by more than 6000 acres in all three study areas investigated in this study between 1986 and 2017. Much of the ERC expansion was into deciduous woodlands. Therefore, ERC control measures should be incorporated into oak woodland restoration efforts within the forest-prairie ecotone of Kansas.
Harrell, Charles Wesley III. "Effects of prescribed burning, mechanical and chemical treatments to curtail rhododendron dominance and reduce wildfire fuel loads." Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/31512.
Повний текст джерелаMaster of Science
Pearce, Christopher Deane. "Effectiveness of Treatments to Reduce Rhododendron maximum and Promote Tree Seedling Regeneration in the Southern Appalachians." Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/41885.
Повний текст джерелаMaster of Science
Tillová, Jana. "Studium chování betonů při působení vysokých teplot." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-225881.
Повний текст джерелаAdamec, Tomáš. "Zvýšení životnosti zápalníku palné zbraně s pomocí explicitního řešiče." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-443722.
Повний текст джерелаŽák, Michal. "Studium vlastností cementových betonů při působení vysokých teplot." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-240106.
Повний текст джерелаMagnusson, Mikael S. "Interfibre Joint Strength under Mixed Modes of Loading." Doctoral thesis, KTH, Hållfasthetslära (Inst.), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-145669.
Повний текст джерелаEn av de viktigaste mekanismerna for den lastbarande formagan hos pappersmaterial ar brottegenskapernahos berfogarna. For att eektivt skraddarsy sadana materials egenskaper genom kemiskoch/eller mekanisk behandling samt for att forsta hur sadana modieringar paverkar egenskapernapa en mikroskopisk niva ar provning av individuella ber-ber-kors en allmant anvand metod. Belastningeni en berfog vid sadan provning ar dock generellt komplicerad och ytterligare kunskapom hur berfogars mekaniska egenskaper skall utvarderas ar onskvard. I Artikel A, presenterasen metod for tillverkning samt mekanisk provning av isolerade ber-kors vid tva olika typer avbelastning. Vidare undersoks hur torktrycket, torkmetoden samt graden av malning inverkar pafogstyrkan. Resultaten visar att brottlasten for en globalt akande belastning var omkring 20 % avbrottlasten for prov utforda med den konventionella skjuvande belastningen samt att styrkan hosindividuellt tillverkade berkors ar fordelade enligt en Weibull fordelning. I Artikel B, presenterasen numerisk metod for utvardering av fogstyrke-matningar med avseende pa kraft- och momentresultanternai gransytan mellan brerna. Metoden anvands for att studera belastningsmoden hosber-kors i tva principiellt olika lastfall. Resultaten visar att for ett typiskt berfogsprov, kan intelastkomponenterna, vid sidan av skjuvning, generellt forsummas da de ar starkt beroende avber-korsets geometri. I Artikel C, jamfors fogstyrkematningar under fyra principiellt olika lastfall; akande, skjuvande, rivande samt biaxiellt. De experimentella last-forskjutningskurvorna, samtde beraknade lastmoderna anvands for att undersoka vilket tillskott pa information de foreslagnalastfallen kan ge i hansyn till fogstyrkan hos massabrer. I Artikel D, undersoks en polymers (somabsorberats pa berytorna) inverkan pa saval berniva som pa natverksniva. Fiberfogstyrkan matsexperimentellt och eekten av den kemiska tillsatsen jamfors pa mikroskopisk niva (ber-kors) medtidigare uppmatt eekt pa makroskopisk niva (ark). Rontgentomogra och bildanalys anvands foratt undersoka de strukturella skillnaderna som uppstar i de brosa natverken vid absorption av enpolyamin och resultaten visar att antalet berfogar per berlangdenhet samt att medelkontaktareanokade. Resultaten visar ocksa att medianen av berfogsstyrkan okade med 18 %. Dessa eekter sammantagetar anledningen till varfor polyaminer, sasom PAH, ar sa eektiva for att oka torrstyrkanhos pappersmaterial. I Artikel E, karakteriseras skadebeteendet hos individuella berfogar franett omfattande antal matningar. Ett brottkriterium infors i den numeriska utvarderingsmetoden foratt studera skadebeteendet. Kanslighetsanalys och inverkan av brottparametrarna studeras ocksafor att ge indikationer pa hur egenskaperna kan skraddarsys for att optimera berfogstyrkan.
QC 20140527
BiMaC Innovation
Shah, Syed Kamran Ayub. "Response of fibre metal laminates to blast loading." Thesis, Imperial College London, 2012. http://hdl.handle.net/10044/1/11188.
Повний текст джерелаArora, Hari. "Blast loading of fibre reinforced polymer composite structures." Thesis, Imperial College London, 2012. http://hdl.handle.net/10044/1/9625.
Повний текст джерелаLoach, Simon C. "Repeated loading of fine grained soils for pavement design." Thesis, University of Nottingham, 1987. http://eprints.nottingham.ac.uk/13693/.
Повний текст джерелаSyed, Mohsin Sharifah Maszura Binti. "Behaviour of fibre-reinforced concrete structures under seismic loading." Thesis, Imperial College London, 2012. http://hdl.handle.net/10044/1/17804.
Повний текст джерелаZamperini, Silvia. "Effects of cyclic loading on fibre reinforced titanium metal matrix composites." Thesis, University of Birmingham, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.289709.
Повний текст джерелаGhoor, Ismail B. "The response of concave singly curved fibre reinforced moulded sandwich and laminated composite panels to blast loading." Master's thesis, University of Cape Town, 2018. http://hdl.handle.net/11427/27811.
Повний текст джерелаLeong, Kok Hoong. "Damage accumulation in cross-ply polymer matrix composite laminates under mechanical loading." Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.241115.
Повний текст джерелаGuerrero, Garcia José Manuel. "Micromechanical modelling of hybrid unidirectional composite materials under fibre tensile loading." Doctoral thesis, Universitat de Girona, 2020. http://hdl.handle.net/10803/669043.
Повний текст джерелаEn aquesta tesi, es desenvolupa un model micromecànic per predir el procés de ruptura a tracció de materials compostos unidireccionals híbrids i no híbrids sotmesos a càrregues longitudinals. Derivat d’això, la influència que diferents paràmetres tenen, en el procés de ruptura de materials híbrids, és investigada. Els resultats demostren que el model captura qualitativament el procés de trencament en materials compostos. A més, afegir plasticitat a la matriu i efectes dinàmics en el model permet millorar les prediccions del model comparat amb resultats experimentals. També es demostra que la mida del material té una influència significativa en les propietats híbrides, i que la dispersió de les fibres en el material híbrid té una gran importància en el trencament i el desenvolupament de dany. Per tant, aquesta tesi dóna un pas endavant cap a la inclusió de compostos híbrids en el disseny comercial i la generació de materials més optimitzats
Seidalinova, Ainur. "Monotonic and cyclic shear loading response of fine-grained gold tailings." Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/46531.
Повний текст джерелаMohammadi, Hosinieh Milad. "Behaviour of High Performance Fibre Reinforced Concrete Columns under Axial Loading." Thèse, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/30726.
Повний текст джерелаMagnusson, Mikael S. "Testing and Evaluation of Interfibre Joint Strength under Mixed-Mode Loading." Licentiate thesis, KTH, Hållfasthetslära (Inst.), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-116700.
Повний текст джерелаDe brottmekaniska egenskaperna hos fiberfogar är nyckeln för uppbyggnaden av styrka hos fibrösa material såsom papper och kartong. För att effektivt skräddarsy sådana materials egenskaper genom kemisk eller mekanisk behandling och för att förstå hur sådana modifieringar påverkar egenskaperna på en mikroskopisk nivå är provning av individuella fiber-fiber-kors en allmänt använd metod. Belastningen i en fiberfog vid provning av individuella fiber-fiber kors är dock generellt mycket komplicerad och ytterligare kunskap om hur fiberfogars mekaniska egenskaper skall utvärderas är önskvärd. I Artikel A, presenteras en metod för samtidig tillverkning av flera fiber-fiber kors samt en metod för mekanisk provning av dessa med olika typer av belastning. Metoden tillämpades för att studera styrkan av fiber-fiber-kors med olika geometri och vid två olika lastfall. En undersökning av hur torktrycket, torkmetoden samt graden av malning inverkar på fogstyrkan presenteras. De uppmätta brottlasterna skalades med olika karakteristiska längder för fogen; nominell överlapparea samt fogens längd och bredd. Resultaten visade att ingendera av normaliseringsmetoderna reducerade variationskoefficienten (av medelvärdet av styrkan) samt att brottlasten för en globalt fläkande belastning var omkring 20 % av brottlasten för prov utförda med den konventionella skjuvande belastningen. I Artikel B, presenteras en metod för utvärdering av mätningar av styrkan hos fiberfogar med hänseende på kraft- och moment- resultanterna i gränsytan mellan fibrerna. Metoden används för att studera belastningsmoden hos fiber-fiber--kors provade i två principiellt olika lastfall. Resultaten visar att för ett typiskt fiberfogsprov av isolerade fiber-fiber-kors med långa fria fibersegment, så kan inte belastningsmoderna vid sidan av skjuvning försummas och att de är starkt beroende av fiber-fiber-korsets geometri. För att kunna jämföra fiberfogar av olika storlek och kvantifiera förhållandet mellan normal- och skjuvbelastningen i fogen skalades de resulterande krafterna och momenten med tvärsnittsstorheter baserade på en approximation av fogareans utformning.
QC 20130125
BiMaC Innovation
Kolle, Boris. "Behaviour of steel fibre reinforced high performance concrete under biaxial loading conditions." Thesis, University of Glasgow, 2006. http://theses.gla.ac.uk/715/.
Повний текст джерелаVolschenk, Gideon. "The response of aluminium and glass fibre FMLS subjected to blast loading." Master's thesis, University of Cape Town, 2015. http://hdl.handle.net/11427/13755.
Повний текст джерелаKölle, Boris. "Behaviour of steel fibre reinforced high performance concrete under biaxial loading conditions." Connect to e-thesis, 2006. http://theses.gla.ac.uk/715/.
Повний текст джерелаPh.D. thesis submitted to the Department of Civil Engineering, University of Glasgow, 2006. Includes bibliographical references. Print version also available.
Mohamed, Galal F. A. "Modelling damage and fracture of fibre metal laminates subject to blast loading." Thesis, University of Sheffield, 2012. http://etheses.whiterose.ac.uk/2114/.
Повний текст джерелаPinheiro, Fabiola M. R. "Effects of forest fires and clear-cutting on mercury loading to boreal lakes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0034/MQ64431.pdf.
Повний текст джерелаJradi, Layal. "Study of the influence of fine particles on the properties of liquefaction of sands." Thesis, Paris Est, 2018. http://www.theses.fr/2018PESC1053/document.
Повний текст джерелаSince the last 50 years, the study of the phenomenon of liquefaction of saturated sandy soils has been a topic of extensive laboratory research. Most of the earlier research has focused on the liquefaction of clean sands assuming that the presence of fines resists the development of pore water pressure as well as the risk of liquefaction. However, natural sand is found in nature under the form of a mixture of sand and fines and, the influence of these fines on the liquefaction risk of this type of material is still unclear. In fact, we could find contradictory results in the literature review of the effect of fine particles on the sand liquefaction phenomenon. In this context, the main objective of this study is to clarify and quantify the influence of fine particles (plastic and non-plastic) present in a sandy matrix on the initiation and development of the liquefaction phenomenon .We’ve focused, in particular, on the nature of fine particles (plastic/non-plastic), their proportion in the matrix, the matrix compactness condition and initial stress state (state consolidation). For this purpose, with the aid of a new triaxial servo-hydraulic device, a series of monotonic and cyclic tests were done in order to clarify this effect. Experimental results show that the increase in non-plastic fines increases the resistance to liquefaction of the mixture under both monotonic and cyclic loading. However, this trend is reversed for the mixtures containing plastic fines. Finally a comparison has been established between the behavior of these soils under undrained monotonic and cyclic shearing in terms of evaluation of the initiation of instability phenomenon and other mechanical parameters
Teo, Wern Sze. "The performance of carbon-fibre composite joints : pre-bond moisture and loading rate effects." Thesis, Imperial College London, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.501293.
Повний текст джерелаBurrell, Russell P. "Performance of Steel Fibre Reinforced Concrete Columns under Shock Tube Induced Shock Wave Loading." Thesis, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/23516.
Повний текст джерелаKrashanitsa, Roman Yurievich. "An Inverse Computational Approach for the Identification of the Parameters of the Constitutive Model for Damaged Ceramics Subjected to Impact Loading." Diss., Tucson, Arizona : University of Arizona, 2005. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu%5Fetd%5F1390%5F1%5Fm.pdf&type=application/pdf.
Повний текст джерелаStuhlinger, Martin Ernst. "The influence of mixing ratio on the fatigue behaviour of fibre reinforced polymers." University of the Western Cape, 2013. http://hdl.handle.net/11394/5041.
Повний текст джерелаStatement of the problem: Fibre reinforcement of polymethyl methacrylate (PMMA) denture base material is known to improve the strength, as well as the fatigue behavior, of the material. The powder liquid (P/L) ratio of PMMA is often changed to modify the handling properties of the material. Little is known about the effect of this deviation from manufacturer’s guidelines on the fatigue behaviour of the fibre reinforced product. Purpose: This study compared the flexural strength (FS) of PMMA reinforced with glass fibre using different P/L ratios, before and after cyclic loading. Methods and materials: Three groups, with 50 glass fibre reinforced (everStick nonimpregnated fibers) heat-cured PMMA resin (Vertex Rapid Simplified) specimens each, were prepared using a custom-made template (dimensions 10x9x50mm). Each group had a different P/L ratio: the control group (100%) had the manufacturer’s recommended ratio; the 90% and 80% groups had reduced P/L ratios (by weight).Twenty five specimens from each group were subjected to a 3-point bending compression test using a universal testing machine. The remaining 25 specimens from each group were subjected to cyclic loading (104 cycles) before compression testing. The (FS) was calculated using the highest force (Fmax) before specimen failure. Flexural strength was calculated using the equation: FS=3WL/2bd2. Within each group, median FS values before and after cyclic loading were compared by means of a non-parametric analysis of variance. The Aligned Ranks Transform method was used for the analysis. Statistical significance was set at p=0.05. Results: The Fmax (N) of the control (100%), 90% and 80% groups fatigued and unfatigued were 100%: 1665 (fat), 1465 (unfat); 90%: 1679 (fat), 1548 (unfat) and 80%: 1585 (fat), 1467 (unfit) respectively. There was no significant interaction between Mix ratio and Fatigue state, and the 80% mix had a significantly higher mean than either the 90% or 100% mix (with differences of about 0.3 units for both). The Fatigued state had a higher mean than the Un- fatigued state by about 6.0 units. Using FS (MPa) it was found that the fatigued 80% mix specimens had the highest value. The FS MPa of the control (100%), 90% and 80% groups fatigued and un-fatigued were 64.3, 60.6; 66.9, 65.6 and 70.2, 69.3 respectively. The fact that fatiguing strengthened the specimens merits further research. When observing the broken specimens it was found that there was a complete debonding of the fibres and the PMMA. Conclusion and clinical relevance: a) Fibre: The benefit of using glass fibre bundles to reinforce prostheses fabricated using heat cured PMMA is questionable due to problems with bonding between the fibre bundles and the heat cured PMMA resin. b) Fatiguing: An average person chews 107 times during a 3 year period. A limited period of average masticatory forces should not have a detrimental effect on prostheses made from heat cured PMMA resin. c) Mix ratio: Within the normal parameters of laboratory techniques the mix ratio of PMMA resin had no significance on the fracture resistance of the prostheses. Due to the high cost of the fibres used for the reinforcement and the limited success and insignificant results achieved in this study, this researcher cannot recommend using Stickbond or Stick fibers for the reinforcement of dentures made with heat cured PMMA resin.
Schreiber, Sascha K. "Punching shear capacity of slab-column connections with steel-fibre reinforcement under lateral cyclic loading." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ60493.pdf.
Повний текст джерелаBateman, Samuel. "Hollow core fibre-based gas discharge laser systems and deuterium loading of photonic crystal fibres." Thesis, University of Bath, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.648951.
Повний текст джерелаDo, Tan Manh. "Excess pore water pressure generation in fine granular materials under cyclic loading -A laboratory study." Licentiate thesis, Luleå tekniska universitet, Geoteknologi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-83517.
Повний текст джерелаKhusru, Shovona. "High performance hybrid structural column with rubberised concrete under axial compressive loading." Thesis, Queensland University of Technology, 2022. https://eprints.qut.edu.au/233665/1/Shovona_Khusru_Thesis.pdf.
Повний текст джерелаKhalighi, Yashar. "A study of bond between fibre reinforced polymer and concrete under quasi static and impact loading." Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/12345.
Повний текст джерела