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Teses / dissertações sobre o tema "Failure envelopes"

Autor: Grafiati
Publicado: 4 de junho de 2021
Última modificação: 7 de fevereiro de 2022

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1

Dharmasaroja, Atipong. "Efficient modelling of failure envelopes and load patterns in aircraft structures." Thesis, Queen's University Belfast, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.695327.

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Due to the dynamically-varying nature of aircraft loading scenarios, a large number of global load cases are generated which must be analysed in a Global Finite Element Model (GFEM) to obtain the internal load paths going into each substructure. Analysing all load cases is often not possible due to computational constraints, so that substantial engineering judgement in load case down-selection is required. One innovation developed by QUB to reduce the number of load cases is to use Singular Value Decomposition (SVD) to derive a smaller set of characteristic loads which represent all the global
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2

Meng, Qiuhong. "Bearing capacity failure envelopes of foundations with skirts subjected to combined loading." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for bygg, anlegg og transport, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-23367.

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The bearing capacity of the foundation is reduced in combination with horizontal loads and moments, and can be further reduced when torsion moment is applied. Therefore, torsion moment must be taken into account when calculating the loading capacity. This is particularly relevant for offshore foundations (underwater structures), since torsion is often of considerable size.The aim of this thesis is to make a numerical study of a rectangular mudmat foundation subjected to vertical loading, horizontal loading and torsion moment. The numerical calculations were mainly calculated by the finite elem
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3

Saied, Ramadan Omar. "Failure envelopes for filament wound composite tubes in water at elevated temperatures." Thesis, University of Newcastle Upon Tyne, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.402279.

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4

Supachawarote, Chairat. "Inclined load capacity of suction caisson in clay." University of Western Australia. School of Civil and Resource Engineering, 2007. http://theses.library.uwa.edu.au/adt-WU2007.0188.

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This thesis investigates the capacity and failure mode of suction caissons under inclined loading. Parametric finite element analyses have been carried out to investigate the effects of caisson geometry, loading angle, padeye depth (i.e. load attachment point), soil profile and caisson-soil interface condition. Displacement-controlled analyses were carried out to determine the ultimate limit state of the suction caissons under inclined load and the results presented as interaction diagrams in VH load space. VH failure interaction diagrams are presented for both cases where the caisson-soil int
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5

Reyes, Esteves Rocio Guadalupe, and Esteves Rocio Guadalupe Reyes. "Modeling Approaches to Determination of Appropriate Depth and Spacing of Subsurface Drip Irrigation Tubing in Alfalfa to Ensure Soil Trafficability." Thesis, The University of Arizona, 2017. http://hdl.handle.net/10150/625691.

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A major design issue in the implementation of a Subsurface Drip Irrigation (SDI) system for extensively crops such as alfalfa (i.e. crops that cover the entire surface as opposed to row crops), is the determination of the appropriate depth of placement of the drip line tubing. It is important to allow necessary farming operations with heavy equipment at harvesting times while still providing adequate water to meet the crop water requirements. It is also a need to ensure appropriate spacing between the dripline laterals to assure reasonable lateral irrigation uniformity for plant germination.
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6

Eriksson, Daniel, and Tobias Gasch. "Load capacity of anchorage to concrete at nuclear facilities : Numerical studies of headed studs and expansion anchors." Thesis, KTH, Betongbyggnad, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-40820.

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The aim of this thesis was to study the load bearing capacity of anchor plates, used for anchorage to concrete located at nuclear facilities. Two different type of anchor plates were examined, which together constitute the majority of the anchor plates used at Forsmark nuclear facility in Sweden. The first is a cast-in-place anchor plate with headed studs and the second is a post-installed anchor plate which uses sleevetype expansion anchors. Hence, anchors with both a mechanical or a frictional interlock to the concrete were examined. The main analysis tool was the finite element method, thro
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7

Olliff, Derrick K. "Characterizing the failure envelope of a conductive adhesive." Thesis, Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/19093.

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8

Maghsoudloo, Arash. "Nonlinearity Of The Residual Shear Strength Envelope In Stiff Clays." Master's thesis, METU, 2013. http://etd.lib.metu.edu.tr/upload/12615551/index.pdf.

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During shearing of stiff clays, plate-shaped clay particles are parallel-oriented in the direction of shear reaching the minimum resistance of &ldquo<br>residual shear strength&rdquo<br>. The residual shear strength envelopes of stiff clays are curved, but for practical purposes represented by linear envelopes. This study investigates the nonlinearity of the residual shear strength envelope using experimental evidence (i) from laboratory reversal direct shear tests on two stiff clays (Ankara clay and kaolinite) at 25 to 900 kPa effective normal stresses and (ii) from laboratory data collected
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9

Crosby, Jessica Renee. "Expanding the Performance Envelope of the Total Artificial Heart: Physiological Characterization, Development of a Heart Failure Model, And Evaluation Tool for Mechanical Circulatory Support Devices." Diss., The University of Arizona, 2014. http://hdl.handle.net/10150/344221.

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Heart failure (HF) affects an estimated 5.8 million Americans, accounting for near 250,000 deaths each year. With shortages in available donor hearts, mechanical circulatory support (MCS) has emerged as a life-saving treatment for advanced stage HF. With growth in MCS use, a clinical and developmental need has emerged for a standard characterization and evaluation platform that may be utilized for inter-device comparison and system training. The goal of this research was to harness SynCardia's total artificial heart (TAH) to meet this need. We first sought to characterize the TAH in modern phy
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10

Jin, Zhuang. "Numerical investigation of caisson foundations in sand under combined monotonic loadings for offshore wind turbines." Thesis, Ecole centrale de Nantes, 2019. http://www.theses.fr/2019ECDN0002/document.

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Cette thèse de doctorat porte sur la réponse des fondations caisson dans du sable pour les éoliennes en mer soumises à des chargements monotones et cycliques combinés. Le processus de défaillance et l’enveloppe de rupture (diagramme de capacité portante) d’une fondation en caisson dans du sable soumise à des chargements monotones combinés sont premièrement étudiés à l’aide du modèle constitutif de Mohr-Coulomb. La méthode Lagrangian-Smoothed Particle Hydrodynamics Combinée (CLSPH) est adoptée pour prendre en compte les grandes déformations et les limites de l'approche sont mises en évidence. U
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11

Hoang, Thi Than Nhan. "Étude du comportement d'un milieu rocheux fracturé : application à la réalisation du tunnel de St Béat (France 31)." Thesis, Paris Est, 2010. http://www.theses.fr/2010PEST1066/document.

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La conception des ouvrages de génie civil dans les massifs rocheux fracturés nécessite une connaissance de leur comportement lors des travaux. Les ma ssifs fracturés sont généralement très complexes et représentés par des matrices et des discontinuités rocheuses. Cette thèse a pour objectif d'étudier le comportement mécanique du massif du futur tunnel de St Béat. La thèse est divisée en trois parties. Nous étudions tout d'abord les phénomènes prépondérants et les facteurs agissant sur le comportement mécanique des massifs rocheux. Dans la seconde partie, nous effectuons séparément des études e
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12

Uguen, Alexandre. "Influence de l'endommagement plan sur le comportement hors-plan des composites stratifiés et des assemblages collés." Thesis, Brest, 2017. http://www.theses.fr/2017BRES0004/document.

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Les matériaux composites sont utilisés dans le domaine maritime depuis des dizaines d’années que ce soit par exemple pour les éoliennes offshore ou encore les navires militaires étant donné leurs propriétés intrinsèques avantageuses pour de telles applications (faible masse, faible signature magnétique ...). Jusqu’ici les composites employés sont surtout composés de fibres de verre et de matrice polyester. Cependant, les demandes croissantes de navires toujours plus légers et rapides conduisent peu à peu les industriels à se tourner vers les composites à haute performance composés de fibres de
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13

Kobeissi, Alaa. "Caractérisation mécanique des matériaux composites à partir d'un essai de traction biaxiale intégrant l'effet des chemins de déformation." Thesis, Rennes, INSA, 2019. http://www.theses.fr/2019ISAR0021.

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Les matériaux composites à fibres continues sont largement utilisés dans la plupart des applications d'ingénierie en raison de leurs propriétés mécaniques spécifiques élevées. Les essais uniaxiaux sont principalement utilisés pour la caractérisation de ces matériaux en raison de leur simplicité et de leur faible coût. Cependant, ces essais ne sont pas adaptés pour caractériser le comportement du matériau soumis à un état de contrainte multiaxiale. Pour mieux caractériser leur comportement, des essais biaxiaux ont été développés. Pam1i les différentes techniques de traction biaxiale, l'essai de
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14

Girardello, Vinícius. "Comportamento de ensaios de arrancamento de placas embutidas em camadas de solo-cimento-fibra." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2014. http://hdl.handle.net/10183/103823.

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Fundações diretas submetidas a carregamentos de compressão vertical têm sido frequentemente ensaiadas e seus comportamentos já são bem conhecidos no ramo de projeto de fundações. Fundações submetidas à tração têm crescido em importância devido ao aumento de perspectivas de uso de fontes de energia renováveis tais como turbinas de energia eólica e não renováveis tais como plataformas petrolíferas, bem como torres de transmissão de energia, cujas cargas de tração podem ser de grande importância. Contudo, esforços de tração em fundações é ainda um tema não consolidado que merece atenção tanto qua
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15

Bjurström, Henrik, and Johan Lasell. "Capacity assessment of a single span arch bridge with backfill : A case study of the Glomman Bridge." Thesis, KTH, Civil and Architectural Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10065.

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<p> </p><p>The aim of this Master Thesis is to assess the load carrying capacity of the Glomman Bridge outside of the Swedish city Örebro. The Glomman Bridge is an unreinforced concrete single span arch bridge with backfill. The bridge was constructed in 1923 on assignment from the Swedish National Railways (SJ).</p><p>The failure criteria used in this thesis is that the bridge collapses when any cross section in the concrete arch reaches its ultimate capacity. In reality, the bridge may manage heavier loads than this. When the capacity is reached in a cross section, a hinge is formed and the
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16

Silvani, Carina. "Solos artificialmente cimentados em célula cúbica : isotropia a pequenas deformações e na ruptura." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2017. http://hdl.handle.net/10183/157899.

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O solo é base de praticamente todas as obras de Engenharia Civil e em algumas situações este não apresenta condições de suportar o carregamento imposto. Tal problema pode ser solucionado com técnicas de estabilização. A estabilização com cal é uma técnica clássica, porém não apresenta um método racional de dosagem e uma superfície de falha tridimensional conhecida. Entretanto este quadro vem alterando-se por meio de pesquisas que buscam utilizar o coeficiente porosidade/teor volumétrico de cal para dosar solo-cal. Assim, esta pesquisa tem como objetivo avaliar a influencia do coeficiente n/(Li
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17

Otoupalík, Jan. "Vibrace valivých ložisek." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230797.

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The thesis deals with vibrations caused by geometric defect and fatigue damage of rolling element bearing. Hardware for vibration measurement is tested on 25 new pieces of NJ 304. Second part of the thesis examines if measuring of bearing vibration can help to detect a geometric defect. Geometric defects are detected according to a spectrum of vibration but the results are not absolutely exact. The possibility to detect geometric defects by measuring vibration has not been proven. The end of project tests diagnostic methods for rolling element bearings. The bearing defect was simulated to demo
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18

Chen, Ting-Jung, and 陳婷容. "Failure Envelopes of Anisotropic Open-cell Foams Under Multiaxial Stresses." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/9ed9x5.

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碩士<br>國立成功大學<br>土木工程學系碩博士班<br>92<br>Open-cell foams are typically used as core materials in lightweight sandwich panels which are always subjected to a general state of multiaxial stresses. Thus, the mechanical properties and the failure criteria corresponding to different failure mechanisms for open-cell foams under multiaxial stresses are essential and important to the structural integrity of lightweight sandwich panels. Since open-cell foams are normally anisotropic due to processing, their mechanical properties will be affected by their cell geometry, namely the anisotropy ratio. In thi
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19

Silva, Rivera Moisés Israel. "A database tool to support building envelope failure diagnosis." Thesis, 2003. http://spectrum.library.concordia.ca/2398/1/MQ91115.pdf.

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This thesis' objective is to develop a tool to support the diagnostic process during a building envelope investigation. Access to the files of the Quebec Home Builder's Association (APCHQ) allowed information on residential building envelope failures in Quebec to be collected and organized into a computer database. Analysis of the database information pointed to water infiltration as the most frequent failure in the first 5 years of life of the houses. Inappropriate design accounted for 43% of the problems, 25% were due to deficient workmanship, and 11% to wrong detailing. The database built
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