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Dissertations / Theses on the topic 'Impact shear'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Lease, Adam R. "Insulation Impact on Shear Strength of Screw Connections and Shear Strength of Diaphragms." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/44783.

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Several thousand tests throughout the world have been conducted on the shear strength of screw connections in cold-formed steel, however, little to no research has been conducted on how various thicknesses of insulation placed between two sheets of steel, such as a steel panel and structural supporting member, affects a screw's shear strength. Elemental tests were conducted as part of this study at Virginia Tech where rolled fiberglass insulation was placed between two pieces of steel connected by self-drilling screws and tested to failure. The results were compared to the North American Spe

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2

Mjöberg, Mårten, and Axel Stenfors. "CPTu Configuration Impact on Evaluated Undrained Shear Strength." Thesis, KTH, Jord- och bergmekanik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-279465.

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This thesis evaluates the commonly used geotechnical probing method CPTu, on how different probe configurations impact the resulting evaluated undrained shear strength in soft clay deposits, in comparison to each other and laboratory methods. This is done by performing field investigations on Lindefältet, Södermanlands län, Sweden. Comparison is done on the two Swedish manufacturers of CPTu probes, by different calibration limits, filter types and whether overloading the probe over the calibration limit affects the evaluated undrained shear strength registered. The main conclusions are that on

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3

Boakye-Yiadom, Solomon. "Microstructural evolution of adiabatic shear bands in steel by impact." Materials Science And Engineering A, 2014. http://hdl.handle.net/1993/24095.

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This research, is initiated to systematically study the microstructure of AISI 4340 steel prior to impact, after impact and after post-impact annealing to determine the effect of the pre-deformation microstructure on the nucleation and initiation of ASBs, and the mechanism of evolution of ASBs during impact. This study used state-of-the-art microstructural characterization techniques such as the FIB and STEM/HRTEM to reveal that initial microstructural inhomogeneity produces nucleation sites for the initiation of ASBs during impact. It was observed that double misfit interfaces and boundary la

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4

Stevens, John Boyet. "Finite Element Analysis of Adiabatic Shear Bands in Impact and Penetration Problems." Thesis, Virginia Tech, 1996. http://hdl.handle.net/10919/36650.

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We study axisymmetric deformations of depleted uranium (DU) and tungsten heavy alloy (WHA) rods impacting at normal incidence both a rigid, planar target and a thick, deformable steel target. Each deformable material is modeled as elastic thermoviscoplastic; the flow stress increases with an increase in the effective plastic strain and effective plastic strain-rate but decreases with a rise in the temperature. An objective of this work is to ascertain when and where a shear band, defined as a narrow region of rapid, intense plastic deformation, forms in each material subject to impact loading.

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5

Mahjoub-Moghaddas, Hamid. "Tensile and shear impact strength of concrete and fibre reinforced concrete." Thesis, Cardiff University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.261439.

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6

Cui, Xiaoyu. "Drop-weight Impact Behaviour of a Shear Thickening Fluid in a Finite Volume." Thesis, The University of Sydney, 2021. https://hdl.handle.net/2123/25941.

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This thesis aims to study and explore the drop-weight impact-induced solidification process of an STF, consisting of 58 vol% styrene/acrylate particles in ethylene glycol, in a finite volume. The study begins with the characterisation of the mechanical behaviours (i.e., rheological and confined compression behaviours) of the STF. Low-velocity drop-weight impact experiments are conducted to investigate the effect of the STF’s dimensions in a finite volume on the impact behaviour of the STF. It is found that the impact behaviour is related to both the depth and the diameter of the STF. A new mo

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7

Ruiz, Daniel John. "Mechanical behaviour of materials at high rates of strain : a study of the double notch shear test." Thesis, University of Oxford, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.280611.

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8

Núñez, Pezo Eduardo Antonio. "Impact of shear in computing p-y curves for a RC pile." Tesis, Universidad de Chile, 2013. http://www.repositorio.uchile.cl/handle/2250/114479.

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Ingeniero Civil<br>Estudios realizados por Stewart et al, 2007, y posteriormente por Lemnitzer et al, 2013, han mostrado que para una pila con restricción al giro en el cabezal (Fixed Head) los desplazamientos por esfuerzo de corte pueden llegar a contribuir en un 40% de los desplazamientos totales, a nivel de terreno, y sugieren que el efecto de corte influye en la determinación de curvas p y. De esta forma, se ha utilizado un modelo de interacción corte flexión para estimar el efecto del corte en la determinación de las curvas p y, modelo inicialmente propuesto por Massone et al, 200

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9

O'Connor, Bernard. "High strain deformation and ultimate failure of HIPS and ABS polymers." Thesis, Cranfield University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245417.

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10

Armstrong, Victoria. "The impact of shear rate and prolonged sitting on endothelial function in children." Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/63446.

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Prolonged sitting has been shown to impair endothelial function in children, yet the mechanisms underlying this remain unclear. In adults, there is a decline in endothelial function, indexed using flow-mediated dilation (FMD), after 1 hour of sitting. When localized heating was used to increase shear stress, the sitting-induced reduction in FMD can be prevented, confirming this decline was shear-stress mediated. The relationship between FMD and shear stress is weaker in children and whether limb heating increases shear stress and FMD in children is unknown. We therefore examined the time-cours

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11

Muller, Christopher Dustin. "Shear Forces, Floc Structure and their Impact on Anaerobic Digestion and Biosolids Stability." Diss., Virginia Tech, 2006. http://hdl.handle.net/10919/28768.

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This study was conducted to address the controlling factors of biosolids stability as they relate to mesophilic anaerobic digestion, dewatering processes and digestion enhancement by wet sludge disintegration technologies. The working hypothesis of this study is that digestion performance; nuisance odor generation and the degree of digestion enhancement by wet sludge disintegration are directly related to anaerobic floc structure and its interaction with shearing forces. Mesophilic digestion was studied in two modes of operation, convention high rate and internal recycle mode to enhanced dig

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12

Bell, A. P. "Finite element analysis of shear band failure with particular reference to circular plate impact." Thesis, City University London, 1989. http://openaccess.city.ac.uk/7410/.

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This thesis addresses the problem of the numerical simulation of the shear band or 'plugging' mode of failure in metallic solids. Particular reference is made to the normal impact between blunt projectiles and circular plates of thin to intermediate thickness. The thesis presents a two dimensional axisymmetric and plane strain finite element computer program related to the Lagrangian reference frame. A four node element with one point quadrature and associated stabilisation is utilised, and is shown to be superior to standard isoparametric implementations when applied within an explicit time i

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13

Cheng, Jialun. "Striker Shape Effect on Low-velocity Impact Energy Absorption of a Shear Thickening Fluid." Thesis, University of Sydney, 2020. https://hdl.handle.net/2123/22694.

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This thesis aimed to systematically investigate striker shape effect on the mechanical behaviours and energy absorption capabilities of a shear thickening fluid (STF) under low-velocity impact tests. STF is a non-Newtonian colloidal suspension system with a preferable energy absorption capability under both low-velocity and high-velocity impact. This study’s STF consisted of 58.8 vol. % styrene/acrylate co-polymer particles in an ethylene glycol medium. First, rheology tests and scanning electron microscope tests were implemented to study the shear thickening behaviour and submicron-configura

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Ramirez, Amanda Christine. "Microstructural properties associated with adiabatic shear bands in Ti-6A1-4V deformed by ballistic impact." To access this resource online via ProQuest Dissertations and Theses @ UTEP, 2008. http://0-proquest.umi.com.lib.utep.edu/login?COPT=REJTPTU0YmImSU5UPTAmVkVSPTI=&clientId=2515.

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15

Gurbuz, Tuba. "Impact performance and mitigation of reinforced concrete columns." Thesis, Queensland University of Technology, 2018. https://eprints.qut.edu.au/122182/1/Tuba_Gurbuz_Thesis.pdf.

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This thesis studies the behavior of RC columns vulnerable to vehicular impacts and develops an appropriate retrofitting technique to mitigate the adverse effects of the impact. The findings of this research will inform new designs and retrofitting of existing designs to enhance their safety and protect the structures they support

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16

Chiu, Jack. "The Effect of Ballistic Impact on Adhesively-Bonded Single Lap Joints in the Shear Mode." Thesis, The City College of New York, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10743329.

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<p> Adhesive bonding is a common, robust, and inexpensive method of joining materials. Of particular interest is the behavior under shear loading, where adhesive bonding excels compared to alternative joining methods. However, while the quasi-static response of these joints is well understood, the dynamic behavior is largely unknown. </p><p> To this end, a series of experiments were devised and performed where two bars are adhesively bonded using a simple lap joint and subjected to a high-speed impact from a steel slug. These tests were configured to, as much as possible, isolate the type

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Laha, Animesh. "Development and impact performance analysis of shear thickening fluid treated 2D and 3D fabric structures." Thesis, IIT Delhi, 2017. http://localhost:8080/xmlui/handle/12345678/7250.

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18

Mohammadi, Aragh Mahdi [Verfasser], and Hans [Akademischer Betreuer] Burchard. "The impact of advection schemes on lateral shear and baroclinic instability / Mahdi Mohammadi Aragh. Betreuer: Hans Burchard." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2015. http://d-nb.info/1066898391/34.

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19

Soleimani, Sayed Mohamad. "Sprayed glass fiber reinforced polymers in shear strengthening and enhancement of impact resistance of reinforced concrete beams." Thesis, University of British Columbia, 2006. http://hdl.handle.net/2429/31069.

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Shear failure of reinforced concrete (RC) beams is often sudden and catastrophic. A timely shear strengthening of deficient RC beams is therefore critical in view of maintaining public safety. In this dissertation, the effectiveness of externally bonded sprayed glass fiber reinforced polymer (Sprayed GFRP) in shear strengthening of RC beams under both quasi-static and impact loading was investigated. Direct comparisons were drawn with hand-applied, site-impregnated FRP fabric. To study RC beams under impact loads, a unique test setup was developed. In this setup, both the striking hamme

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20

DaBreo, Jamin. "Impact of gravity loads on the lateral performance of cold- formed steel frame/ steel sheathed shear walls." Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=114511.

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Canadian seismic design provisions for cold-formed steel framed/steel sheathed shear walls have been developed from previous research at McGill University with the intent of being incorporated into the Canadian section of the North American Lateral Design Standard for Cold-Formed Steel Framing (AISI S213), and ultimately to provide guidelines for design of these systems in the National Building Code of Canada and CSA-S136 Specification.In this previous research, a limited number of shear walls displayed unfavourable damage due to twisting deformations of the chord-studs and by local buckling.

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21

Bark, David Lawrence Jr. "The hemodynamics during thrombosis and impact on thrombosis." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37258.

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Atherothrombosis can induce acute myocardial infarction and stroke by progressive stenosis of a blood vessel lumen to full occlusion. The goal of this research is to determine what shear rates are pertinent to an occluding blood vessel, the rate of thrombus growth relative to wall shear rates, and to develop a predictive model for estimating length of time to thrombus occlusion for a given atherosclerotic lesion. Computational studies of severely stenotic idealized vessels were performed to investigate the wall shear rates that may exist. The study shows that maximum shear rates in severe sh

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22

Perret, Emeline. "Transport of moderately sorted gravels at low bed shear stress : impact of bed arrangement and fine sediment infiltration." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1223/document.

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Le but de cette thèse est de comprendre la dynamique des graviers au sein des rivières alpines à faible contrainte en utilisant des expériences en laboratoire. Ces rivières sont souvent composées d’une large gamme de sédiments, allant des argiles aux galets. Ces différentes classes sédimentaires peuvent interagir entre elles, ce qui peut rendre difficile l’estimation du transport solide. Des expériences en laboratoire ont été conduites en écoulements instationnaires dans un canal de 18m de long et 1m de large. Deux types de lits ont été étudiés : lits unimodaux et bimodaux. Une attention parti

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23

Darkwah, Joseph. "Protein stability : impact of formulation excipients and manufacturing processes in protein-based pharmaceuticals." Thesis, De Montfort University, 2017. http://hdl.handle.net/2086/16284.

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Presently, over 300 proteins or peptide based therapeutic medicines have been approved by the FDA owing to advances in protein engineering and technology. However, majority of these protein-based medications are unstable or have limited shelf life when in aqueous form. During pre-formulation and manufacturing, various technological processes including mixing, dissolving, filling (through pipes) can produce strong mechanical stresses on proteins. These stresses may cause the protein molecule to unfold, denature or aggregate. To improve stability upon formulation, they may be manufactured as fre

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24

Stenberg, Christina. "Cross-linkers, rheology modifiers and lubricants: impact on water retention and rheology of coating colours at various shear rates." Thesis, Karlstads universitet, Institutionen för ingenjörs- och kemivetenskaper, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-45881.

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25

Pawelko, Romain. "Étude des phénomènes thermiques associés à des sollicitations mécaniques à grande vitesse." Thesis, Paris 10, 2018. http://www.theses.fr/2018PA100058/document.

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Lorsqu'un matériau est soumis à une sollicitation mécanique rapide, une partie de l'énergie mécanique est convertie en énergie thermique et une autre partie est stockée dans le matériau (energy of cold work). Dans le cas où la vitesse de déformation est très élevée, il peut se produire un phénomène de localisation accompagné d'une élévation importante de la température. Celle-ci peut atteindre localement des valeurs proches de la température de fusion du matériau. Ce phénomène appelé cisaillement adiabatique possède de nombreuses applications : usinage à grande vitesse, balistique, projection

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26

German, Guy. "Yield-stress drops." Thesis, University of Edinburgh, 2010. http://hdl.handle.net/1842/3792.

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The behaviour of viscoplastic drops during formation and detachment from a capillary nozzle, free-fall, impact on a solid substrate and subsequent spreading are investigated experimentally by high-speed imaging. Drop dynamic behaviour is an integral component of many contemporary industrial processes ranging from fuelinjection systems in combustion engines to spray coating, agrochemical and pharmaceutical delivery, fire extinguishment and ink-jet printing. Yield-stress fluids are commonly used nowadays in products ranging from mayonnaise to hair-gel. It is hoped that through understanding the

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27

Cassinotto, Christophe. "Diagnostic et évaluation de la gravité des maladies chroniques du foie : impact de l’elastographie par ondes de cisaillement « supersonic shear imaging »." Thesis, Bordeaux, 2016. http://www.theses.fr/2016BORD0231/document.

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Les maladies chroniques du foie constituent un problème majeur de santé publique. L’évaluation précise du degré de fibrose hépatique apporte au clinicien une estimation du pronostic dès la prise en charge initiale de ces patients, mais permet également la réalisation d’une surveillance évolutive, et intervient dans la décision et le choix d’un traitement. L’évaluation noninvasive de la fibrose hépatique par élastographie a permis de révolutionner la prise en charge des malades atteints d’une maladie chronique du foie. L’objectif de notre travail est d’évaluer les performances diagnostiques d’u

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28

Andersson, Nyberg Adrian. "Combining hydrologic modelling and boundary shear stress estimates to evaluate the fate of fine sediments in river Juktån : Impact of ecological flows." Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-145948.

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Altered flow regimes following river regulation can result in significant changes in river bed geomorphology and subsequent negative ecological impacts caused by re-suspended sediments deposited on the riverbed. This study aimed to evaluate the consequences of implementing an ecological flow regime on sediments accumulated within the regulated river Juktån. Sediments were sampled and analysed for particle size distribution to estimate sediment stability. Flow alteration following the ecological flow regime was analysed with HEC-RAS unsteady flow simulation serving as a basis for calculations o

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Wendel, Erik. "Evaluation of potential for metal/polymer/metal sandwich material as outer panels for trucks." Thesis, KTH, Materialvetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-247958.

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Reducing the weight of the truck vehicle conveys more cargo to be carried by thetrailer. This has a significant impact on the efficiency of the transport lowering both the total cost of cargo moved and the total carbon dioxide emitted. Half of the body in-white weight of a truck is comprised out of panels made out of thin mild forming steel which cannot be made thinner to reduce weight due to the lowered stiffness it would entail. Sandwich materials have a high stiffness to weight ratio and would for the same panel thickness as regular forming steel have a comparable bending stiffness but lowe

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Nathenson, David Isaac. "EXPERIMENTAL INVESTIGATION OF HIGH VELOCITY IMPACTS ON BRITTLE MATERIALS." Case Western Reserve University School of Graduate Studies / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=case1138320987.

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31

Nechitailo, Nicholas V. "Finite element analysis of failure modes in dynamically loaded pre-cracked steel plates." Thesis, This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-07282008-135430/.

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32

Birk, Gurpreet Kaur. "Impact of inactivity and exercise on the vasculature in humans : the role of blood flow and shear stress on arterial adaptations in healthy males." Thesis, Liverpool John Moores University, 2011. http://researchonline.ljmu.ac.uk/6102/.

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Exercise training is known to increase endothelial function and provoke arterial remodelling both locally and systemically. This thesis was designed to further examine these relationships by investigating the acute response to different exercise intensities, with and without shear rate modification. Shear rate modification was also used to examine the impact of systemic exercise training on brachial haemodynamics. Finally, the effect of inactivity on vascular function and arterial remodelling were studied using novel models of inactivity. The aim of Study 1 was to examine the effect of shear s

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33

Tauban, Mathieu. "Impact of Filler Morphology and Distribution on the Mechanical Properties of Filled Elastomers : theory and simulations." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSE1069/document.

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Les nanocomposites présentent des propriétés uniques dont l'origine est sujette à débat. Dans ce travail, nous cherchons à déterminer quel est l'impact de la morphologie de la charge et de son état de distribution sur les propriétés des matériaux. Pour cela, nous avons étendu un modèle théorique que nous résolvons numériquement.Nous avons étudié l'effet de la distribution des charges dans la matrice. Nous montrons qu'un état de distribution fortement hétérogène conduit à un renforcement plus important qui s'étend dans une plus large gamme de températures, mais augmente aussi la dissipation d'é

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Slade, Robert Arthur. "Failure Analysis of Impact-Damaged Metallic Poles Repaired With Fiber Reinforced Polymer Composites." Master's thesis, University of Central Florida, 2012. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5505.

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Metallic utility poles, light poles, and mast arms are intermittently damaged by vehicle collision. In many cases the vehicular impact does not cause immediate failure of the structure, but induces localized damage that may result in failure under extreme service loadings or can promote degradation and corrosion within the damaged region. Replacement of these poles is costly and often involves prolonged lane closures, service interruption, and temporary loss of functionality. Therefore, an in situ repair of these structures is required. This thesis examines the failure modes of damaged meta

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Zuanetti, Bryan. "Plate Impact Experiments for Studying the Dynamic Response of Commercial-Purity Aluminum at Temperatures Approaching Melt." Case Western Reserve University School of Graduate Studies / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=case1557132337419911.

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Olsson, Daniel. "Numerical simulations of energy absorbing boundaries for elastic wave propagation in thick concrete structures subjected to impact loading." Thesis, Umeå universitet, Institutionen för fysik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-58015.

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As many of the world’s nuclear power plants are near the end of their supposed life span a need arise to assess the components crucial to the safety of these plants. One of these crucial components is the concrete reactor confinement; to assess its condition, non-destructive testing (NDT) is an attractive method. Traditional testing of concrete structures has comprised of drilling out a sample and performing stress tests on it, but because of the radioactive environment inside the containment this method is far from ideal. NDT is of course possible to use at any structure but at reactor contai

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Braak, Etienne. "Aération pour le décolmatage dans les bioréacteurs à membranes immergées pour le traitement des eaux usées : impact sur le milieu biologique et la filtration." Phd thesis, Toulouse, INPT, 2012. http://oatao.univ-toulouse.fr/8859/1/braak.pdf.

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Cette étude présente les travaux réalisés pour comprendre l'effet de l'aération sur le milieu biologique et sur la filtration dans les bioréacteurs à membranes immergées pour une gamme de paramètres opératoires proche de celles utilisées sur stations réelles. Notre démarche fait le lien entre paramètres opératoires (débit d'aération), hydrodynamique à l'échelle macroscopique (tailles et vitesses de bulles), hydrodynamique à l'échelle locale (contraintes de cisaillement) et propriétés du milieu biologique (taille de flocs et substances polymériques extracellulaires solubles). De moins bonnes p

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DE, NISCO GIUSEPPE. "Impact of Patient-Specific Inflow Boundary Conditions and Concentration Initialization on Hemodynamics and Low-Density Lipoproteins Transport in the Thoracic Aorta." Doctoral thesis, Politecnico di Torino, 2018. http://hdl.handle.net/11583/2706760.

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The complex hemodynamics observed in the human aorta make this district a site of election for an in depth investigation of the relationship between fluid structures, transport and patho-physiology. In fact, it is well known that hemodynamics play an important role in the mass transport of blood specimen, and in turn, in their transfer to the vascular wall and ultimately in the localization of vascular disease in areas of complex arterial flow. In particular, the accumulation of lipoproteins in the arterial intima is a hallmark of atherosclerosis. Low-density lipoproteins (LDL) are the most ab

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Diangha, Maurice Nkinyam Boh. "Punching shear modes of failure in impacted reinforced concrete beams." Thesis, University of Sheffield, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245559.

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Derinoz, Okan. "Impacts Of Soil-structure Interaction On The Fundamental Period Of Shear Wall Dominant Buildings." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607448/index.pdf.

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In many seismic design codes and provisions, such as Uniform Building Code and Turkish Seismic Code, prediction of fundamental period of shear-wall dominant buildings, constructed by tunnel form technique, to compute the anticipated seismic forces is achieved by empirical equations considering the height of the building and ratio of effective shear-wall area to first floor area as the primary predictor parameters. However, experimental and analytical studies have collectively indicated that these empirical formulas are incapable of predicting fundamental period of shear-wall dominant building

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Imamura, Hideo. "Relativistic and shear impacts on the stochastic heating of particles, a dynamical system approach." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ65494.pdf.

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Gibson, Jason. "Nano-Particles in Multi-Scale Composites and Ballistic Applications." Doctoral diss., University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5745.

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Carbon nanotubes, graphene and nano sized core shell rubber particles have all been extensively researched for their capability to improve mechanical properties of thermoset resins. However, there has been a lack of research on their evaluation for energy absorption in high velocity impact scenarios, and the fundamental mechanics of their failure mechanisms during highly dynamic stress transfer through the matrix. This fundamental research is essential for laying the foundation for improvement in ballistic performance in composite armor. In hard armor applications, energy absorption is larg

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He, Yuxin. "Crop residue management and its impacts on soil properties." Diss., Kansas State University, 2015. http://hdl.handle.net/2097/19043.

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Doctor of Philosophy<br>Agronomy<br>DeAnn R. Presley<br>Crop residue removal for livestock feeding and biofuel production at large scales must be evaluated to assess impacts on soil productivity and properties. Among all the potential negative impacts, wind erosion is a major concern in the central Great Plains. We conducted an on-farm study from 2011 to 2013 by removing crop residue at five levels (0, 25, 50, 75, and 100%) to determine the effects of crop residue removal on soil wind erosion parameters such as dry aggregate size distribution including soil wind erodible fraction (EF <0.84 mm

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Bai, Ruqing. "Numerical modeling of isotropic and composites structures using a shell-based peridynamic method." Thesis, Compiègne, 2019. http://www.theses.fr/2019COMP2482.

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Le travail de thèse porte sur de nouveaux compléments et améliorations pour la théorie de la péridynamique concernant la modélisation numérique de structures minces telles que les poutres et les plaques, les composites isotropes et multicouches soumis à un chargement dynamique. Nos développements ont principalement porté sur l'exploration des possibilités offertes par la méthode péridynamique, largement appliquée dans divers domaines de l'ingénierie où des discontinuités fortes ou faibles peuvent se produire, telles que des fissures. La procédure de généralisation de la méthode Peridynamics po

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Tounsi, Rami. "Comportement des structures en nids d'abeilles sous sollicitations dynamiques mixtes compression/cisaillement et effet de l'orientation des cellules." Phd thesis, Université de Valenciennes et du Hainaut-Cambresis, 2014. http://tel.archives-ouvertes.fr/tel-01002421.

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Les nids d'abeille d'aluminium combinent légèreté et grande capacité d'absorption d'énergie. Ils sont alors de plus en plus utilisés dans les secteurs du transport (automobile, aéronautique ...) pour contribuer conjointement à l'allègement structural et à la sécurité. Dans cette thèse, le comportement à l'écrasement des nids d'abeille est étudié en tenant compte de l'effet combiné de l'angle d'orientation dans le plan des cellules, de l'angle de chargement et de la vitesse de sollicitation, que la littérature ne relate pas. Un dispositif de chargement mixte compression/cisaillement est conçu p

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Pereira, Maurício Vieira da Rocha. "Impacto da altura de aerogeradores sobre a velocidade do vento, energia, efeito de esteira e intensidade de turbulência : estudos de caso em três projetos eólicos localizados no Brasil." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/134892.

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O setor eólico está em processo de consolidação no Brasil desde o início dos anos 2000, e oportunidades de pesquisas e desenvolvimento estão presentes em todas as etapas do processo. Este trabalho apresenta uma relação entre os parâmetros de velocidade do vento, energia, efeito de esteira e intensidade de turbulência com diferentes alturas de turbinas existentes no mercado brasileiro, em três regiões distintas, Triunfo/PE, São João do Cariri/PB e São Martinho da Serra/RS. A finalidade do trabalho é auxiliar os desenvolvedores e os investidores de parques eólicos na tomada de decisão sobre as a

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Islam, Mohammad Saiful. "The Influence of Fibre Processing and Treatments on Hemp Fibre/Epoxy and Hemp Fibre/PLA Composites." The University of Waikato, 2008. http://hdl.handle.net/10289/2627.

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In recent years, due to growing environmental awareness, considerable attention has been given to the development and production of natural fibre reinforced polymer (both thermoset and thermoplastic) composites. The main objective of this study was to reinforce epoxy and polylactic acid (PLA) with hemp fibre to produce improved composites by optimising the fibre treatment methods, composite processing methods, and fibre/matrix interfacial bonding. An investigation was conducted to obtain a suitable fibre alkali treatment method to: (i) remove non-cellulosic fibre components such as lignin (sen

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Mera, Juan Dario Rios. "Impacto do pH final na maciez do músculo Longissimus lumborum de animais zebuínos: mudanças estruturais de proteínas da carne crua e cozida durante a maturação." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/11/11141/tde-09062016-173840/.

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O objetivo do presente trabalho foi determinar a força de cisalhamento Warner-Bratzler do músculo Longissimus lumborum de animais zebuínos machos inteiros (Bos indicus) durante o período de maturação, nas faixas de pH final (pHf 48 horas post mortem) normal (pH entre 5,5 e 5,8) e anormal (pH entre 5,81 e 6,19) e temperaturas internas de cozimento. Concomitante com a avaliação de força de cisalhamento, foram avaliadas também a degradação da desmina e troponina T, o comprimento do sarcômero, o teor de colágeno total e solúvel, as temperaturas máximas de desnaturação das proteínas e a morfologia

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Serrano, Luisa Julieth Parra. "Resistência e elasticidade da madeira e de juntas coladas de Eucalyptus grandis W. Hill ex-Maiden e seus impactos na mecânica de vigas laminadas coladas." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/11/11150/tde-23082013-160759/.

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A presente pesquisa teve como objetivo geral a otimização dos parâmetros de colagem para a fabricação de madeira laminada colada de Eucalyptus grandis, enfatizado na interação madeira-adesivo. Foi avaliada a influência da rugosidade, pressão de colagem, tipo de adesivo e tempo de armazenamento da madeira após a preparação das superfícies a serem coladas. Essas variáveis que afetam a qualidade da adesão foram analisadas a partir da resistência apresentada pelas uniões submetidas ao esforço de cisalhamento. Para complementar a compreensão da mecânica das juntas coladas, efetuou-se a caracterizaç

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Naughton, Colleen Claire. "Modeling Food Security, Energy, and Climate and Cultural Impacts of a Process: the Case Study of Shea Butter in Sub-Saharan Africa." Scholar Commons, 2016. http://scholarcommons.usf.edu/etd/6000.

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Millions of people in the world, particularly women and people in sub-Saharan Africa, suffer from hunger and poverty. Three of the major 2015-2030 United Nation’s Sustainable Development Goals (SDGs) aim to eliminate hunger through food security and sustainable agriculture, eradicate poverty, and achieve gender equality through women’s empowerment. Shea trees and their associated fruit and butter can play a major role in each of these three SDGs for women and their families throughout sub-Saharan Africa. Shea trees are located over a wide expanse stretching more than 5,000 kilometers across ov

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