Rozprawy doktorskie na temat „Mechanical properties”
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Conca, Luca. "Mechanical properties of polymer glasses : Mechanical properties of polymer glasses". Thesis, Lyon, 2016. http://www.theses.fr/2016LYSE1050/document.
Pełny tekst źródłaThis manuscript presents recent extensions to the PFVD model, based on the heterogeneity of theh dynamics of glassy polymers at the scale of a few nanometers et solved by 3D numerical simulation, which aim at providing a unified physical description of the mechanical and dynamical properties of glassy polymers during plastic deformation. Three main topics are treated: Plasticization. Under applied deformation, polymers undergo yield at strains of a few percent and stresses of some 10 MPa.We propose that the elastic energy stored at the scale of dynamical heterogeneities accelerates local dynamics. We observe yield stresses of a few 10 MPa are obtained at a few percent of deformation and that plastification is due to a relatively small amount of local yields. It has been observed that dynamics becomes faster and more homogeneous close to yield and that the average mobility attains a stationary value, linear with the strain rate. We propose that stress-induced acceleration of the dynamics enhances the diffusion of monomers from slow domains to fast ones (facilitation mechanism), accelerating local dynamics. This allows for obtaining the homogeneisation of the dynamics, with the same features observed during experiments. Strain-hardening, in highly entangled and cross-linked polymers. At large strain, stress increases with increasing strain, with a characteristic slope (hardening modulus) of order 10 – 100 MPa well below the glass transition. Analogously to a recent theory, we propose that local deformation orients monomers in the drawing direction and slows dows the dynamics, as a consequence of the intensification of local interactions. The hardening moduli mesured, the effect of reticulation and of strain rate are comparable with experimental data. In addition, strain-hardening is found to have a stabilizing effect over strain localization and shear banding
Guillou, Lionel. "Cell Mechanics : Mechanical Properties and Membrane Rupture Criteria". Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLX041/document.
Pełny tekst źródłaAtherosclerosis is a chronic disease of the arteries that is a major cause of heart attacks and strokes. This thesis aims to provide novel insight into this disease by looking at specific factors involved in its development from a mechanical standpoint.Two important cell types involved in the development and progression of atherosclerosis are adherent endothelial cells and non-adherent leukocytes (white blood cells). We developed two devices that are able to measure the mechanical properties of both of these cell types. The first one, termed “profile microindentation”, uses micropipettes and microindenters to indent the cell, while the second one uses microfluidics to submit cells to an extensional stress.Further, we wondered if mechanics could help us understand when deformations undergone by cells, or stresses exerted on them, could become harmful.As a matter of fact, when atherosclerotic plaques occlude too much of the blood flow, the most common treatment consists of reopening the vessel with a balloon and keeping it open with a tubular wired mesh called a stent. This procedure exerts considerable compressive stress on the endothelium and is known to be associated with extensive endothelial damage. Hence, we seek to find a physical criterion that is predictive of endothelial cell membrane rupture under compression and to compare this to the stress exerted on the endothelium during the stenting procedure, to see if endothelial damage could potentially be avoided.Similarly, we seek to obtain a physical criterion that is predictive of leukocyte membrane rupture. We then compare and contrast the maximum possible deformations of leukocytes depending on whether those deformations are passive (such as when going through the microvasculature) or active (such as when leukocytes traverse the endothelial barrier)
Miao, Yuyang. "Mechanics of textile composites : from geometry to mechanical properties /". Search for this dissertation online, 2005. http://wwwlib.umi.com/cr/ksu/main.
Pełny tekst źródłaLoveless, Thomas A. "Mechanical Properties of Kenaf Composites Using Dynamic Mechanical Analysis". DigitalCommons@USU, 2015. https://digitalcommons.usu.edu/etd/4310.
Pełny tekst źródłaOzdemir, Gokhan. "Mechanical Properties Of Cfrp Anchorages". Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12605890/index.pdf.
Pełny tekst źródłaDimitriu, Radu. "Complex mechanical properties of steel". Thesis, University of Cambridge, 2009. https://www.repository.cam.ac.uk/handle/1810/218319.
Pełny tekst źródłaDrodge, Daniel Ryan. "Mechanical properties of energetic composites". Thesis, University of Cambridge, 2010. https://www.repository.cam.ac.uk/handle/1810/265501.
Pełny tekst źródłaRains, Jeffrey K. "Mechanical properties of tracheal cartilage". Thesis, University of British Columbia, 1989. http://hdl.handle.net/2429/27994.
Pełny tekst źródłaApplied Science, Faculty of
Chemical and Biological Engineering, Department of
Graduate
Lintzén, Nina. "Mechanical properties of artificial snow". Licentiate thesis, Luleå tekniska universitet, Geoteknologi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-16798.
Pełny tekst źródłaGodkänd; 2013; 20131002 (ninlin); Tillkännagivande licentiatseminarium 2013-10-23 Nedanstående person kommer att hålla licentiatseminarium för avläggande av teknologie licentiatexamen. Namn: Nina Lintzén Ämne: Geoteknik/Soil Mechanics and Foundation Engineering Uppsats: Mechanical Properties of Artificial Snow Examinator: Professor Sven Knutsson, Institutionen för samhällsbyggnad och naturresurser, Luleå tekniska universitet Diskutant: Tekn. lic. Lars Vikström, LKAB, Luleå Tid: Fredag den 15 november 2013 kl 10.00 Plats: F1031, Luleå tekniska universitet
Root, Samuel E. "Mechanical Properties of Semiconducting Polymers". Thesis, University of California, San Diego, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10745535.
Pełny tekst źródłaMechanical softness and deformability underpin most of the advantages offered by semiconducting polymers. A detailed understanding of the mechanical properties of these materials is crucial for the design and manufacturing of robust, thin-film devices such as solar cells, displays, and sensors. The mechanical behavior of polymers is a complex function of many interrelated factors that span multiple scales, ranging from molecular structure, to microstructural morphology, and device geometry. This thesis builds a comprehensive understanding of the thermomechanical properties of polymeric semiconductors through the development and experimental-validation of computational methods for mechanical simulation. A predictive computational methodology is designed and encapsulated into open-sourced software for automating molecular dynamics simulations on modern supercomputing hardware. These simulations are used to explore the role of molecular structure/weight and processing conditions on solid-state morphology and thermomechanical behavior. Experimental characterization is employed to test these predictions—including the development of simple, new techniques for rigorously characterizing thermal transitions and fracture mechanics of thin films.
Virues, Delgadillo Jorge Octavio. "Mechanical properties of arterial wall". Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/923.
Pełny tekst źródłaChoi, Hwa-Soon. "Mechanical properties of canine pericardium". Diss., Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/15492.
Pełny tekst źródłaPuaud, Max. "Mechanical properties of biopolymer films". Thesis, University of Nottingham, 2000. http://eprints.nottingham.ac.uk/11624/.
Pełny tekst źródłaSalisbury, S. T. Samuel. "The mechanical properties of tendon". Thesis, University of Oxford, 2008. http://ora.ox.ac.uk/objects/uuid:97b73cf6-53bc-4606-b974-a1cdc662e9e8.
Pełny tekst źródłaMcCullough, Kieran. "Mechanical properties of metallic foams". Thesis, University of Cambridge, 1999. https://www.repository.cam.ac.uk/handle/1810/272153.
Pełny tekst źródłaKing, Raymond John. "Dynamic Mechanical Properties of Resilin". Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/33677.
Pełny tekst źródłaMaster of Science
Kappiyoor, Ravi. "Mechanical Properties of Elastomeric Proteins". Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/54563.
Pełny tekst źródłaPh. D.
Bidasaria, Sanjay K. "Electronic and mechanical properties of". Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/28101.
Pełny tekst źródłaCommittee Chair: Marchenkov, Alexei; Committee Member: Callen, William Russell; Committee Member: First, Phillip; Committee Member: Kindermann, Marcus; Committee Member: Riedo, Elisa.
Paternoster, Carlo. "Mechanical properties of nanostructured coatings". Doctoral thesis, Università Politecnica delle Marche, 2009. http://hdl.handle.net/11566/242312.
Pełny tekst źródłaMace, Tamara Lee. "Phase segregation study of thermoplastic polyurethanes". Diss., Available online, Georgia Institute of Technology, 2004:, 2003. http://etd.gatech.edu/theses/available/etd-04072004-180051/unrestricted/mace%5ftamara%5fl%5f200312%5fms.pdf.
Pełny tekst źródłaMacLean, Sean. "Brain tissue analysis of mechanical properties /". Connect to resource, 2010. http://hdl.handle.net/1811/44968.
Pełny tekst źródłaTharmann, Rainer. "Mechanical properties of complex cytoskeleton networks". [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=97998002X.
Pełny tekst źródłaYang, Ting. "Mechanical and swelling properties of hydrogels". Doctoral thesis, KTH, Ytbehandlingsteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-105539.
Pełny tekst źródłaQC 2012
Savage, Gary. "Mechanical properties of carbon/graphite composites". Thesis, Imperial College London, 1986. http://hdl.handle.net/10044/1/38153.
Pełny tekst źródłaYttergren, Rose-Marie. "Mechanical properties of laminated ceramic composites /". Stockholm : Tekniska högsk, 1999. http://www.lib.kth.se/abs99/ytte0910.pdf.
Pełny tekst źródłaChopra, Prateek. "Effective mechanical properties of lattice materials". Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/39436.
Pełny tekst źródłaPope, Stephen Gerard. "Mechanical properties of ion implanted alumina". Diss., Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/19544.
Pełny tekst źródłaKelly, Suzanne Marie. "Cell mechanical properties and volume control". Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=39551.
Pełny tekst źródłaMorsi, Khaled M. B. E. "Mechanical properties of particle reinforced alumina". Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320644.
Pełny tekst źródłaBlewett, Jennifer M. "Micromanipulation of plant cell mechanical properties". Thesis, University of Birmingham, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.520730.
Pełny tekst źródłaHorrigan, Emma. "Disordered microstructures and anomalous mechanical properties". Thesis, University of Exeter, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.496775.
Pełny tekst źródłaDavies, Melissa Lynne F. "Mechanical properties of fish myotomal muscle". Thesis, University of St Andrews, 1995. http://hdl.handle.net/10023/6501.
Pełny tekst źródłaChan, Yan Na-Xin. "The mechanical properties of auxetic foams". Thesis, University of Liverpool, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.528661.
Pełny tekst źródłaKhan, A. A. "Mechanical properties of fruit and vegetables". Thesis, University of Reading, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234479.
Pełny tekst źródłaArce, GarciÌa Isabel. "Mechanical properties of fullerene-like CN_x". Thesis, University of Newcastle Upon Tyne, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.421175.
Pełny tekst źródłaGardham, Louise Marie. "Dynamic mechanical properties of polymer composites". Thesis, University of Leeds, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.395322.
Pełny tekst źródłaGal, Julianna Mary. "Mechanical properties of mammalian intervertebral joints". Thesis, University of Leeds, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305848.
Pełny tekst źródłaChien, H. H. "The mechanical properties of aluminide coatings". Thesis, Cranfield University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.352970.
Pełny tekst źródłaGandhi, Sunil Kumar. "Quantum mechanical properties of the supermembrane". Thesis, Imperial College London, 1989. http://hdl.handle.net/10044/1/47443.
Pełny tekst źródłaLee, Hyungsuk. "Mechanical properties of F-actin network". Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/50588.
Pełny tekst źródłaIncludes bibliographical references.
Cells sense, generate and respond to forces in their surroundings through cytoskeletal dynamics. Actin, the most abundant protein found in eukaryotic cells, is organized into various cytoskeletal structures that provide physical support for the cell and play important roles in numerous cellular processes. Assembly of F-actin into higher-order structures is regulated by over 100 actin binding proteins (ABPs). Although extensive measurements to estimate the mechanical properties of ABP/F-actin networks showed that they are nonlinear and viscoelastic, a full understanding of the origin of such fascinating behaviors is lacking. This thesis presents a multi-scale approach to identify the factors that determine the mechanical properties of F-actin networks from the macroscopic level to the single-molecule level. The mechanical properties of F-actin networks were probed by passive and active methods using optical tweezers. For the passive approach the thermal fluctuations of colloidal spheres are monitored to estimate the frequency-dependent complex shear modulus of an F-actin network. In the active approach, the response of an embedded microsphere to a driving force is tracked to obtain the strain-dependent viscoelasticity. The developed methods were applied to F-actin networks cross-linked with various ABPs such as filamin and a -actinin, with and without gelsolin to control filament length. Microstructures of those networks were also characterized in terms of filament length, mesh size, and degree of bundling.
(cont.) Comparison between cross-linked F-actin with two different length scales of actin filament suggested that network connectivity is another critical parameter in determining mechanical properties. To better understand how the cross-linking protein responds to an external force, a single molecule assay was used to measure the rupture force of a complex formed by an ABP filamin linking two actin filaments. Both force-induced unbinding and unfolding of filamin were observed at the critical force of 70 ± 23pN and 57 ± 19pN, respectively, although unbinding occurred more frequently. Similar pulling experiments were also performed on cross-linked F-actin networks and an abrupt transition was observed in the force trace indicating network rupture. The critical forces at transitions exhibited a similar loading-rate dependence to that observed for rupture forces in the single molecule measurements. Nonlinear behavior observed in strain-dependent microrheology was found to be irreversible. Combined results of molecular unbinding, network rupture, and irreversible network properties suggest that unbinding rather than unfolding is a dominant mechanism governing the mechanical properties of cross-linked F-actin networks. In addition, the mechanical behavior of F-actin networks subjected to an external prestress was investigated using a shear device. Visualization of sheared F-actin networks showed the structural evolution including mesh deformation, filament alignment, and network rupture.
(cont.) Measurement of mechanical properties as a function of external strain demonstrated that some regions exhibited strain-hardening while the others showed strain-softening. Aligned stretching of actin filaments observed at high strain seemed to play a role in strain-stiffening. By comparing the behaviors of an F-actin network cross-linked with wildtype and mutant FLNa, it was demonstrated how molecular structure of the ABP alters the mechanical behavior of F-actin network.
by Hyungsuk Lee.
Ph.D.
Müller-Nedebock, Kristian Kurt. "Statistical mechanical properties of polymer networks". Thesis, University of Cambridge, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.627493.
Pełny tekst źródłaComley, Kerstyn Sigerith Clara. "The mechanical properties of adipose tissue". Thesis, University of Cambridge, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.608929.
Pełny tekst źródłaMorris, Julia Kathleen. "Mechanical properties of phospholipid coated microbubbles". Thesis, University of Edinburgh, 2014. http://hdl.handle.net/1842/9979.
Pełny tekst źródłaBin, Kamaruddin Shamsul. "Long-term mechanical properties of rubber". Thesis, University of Southampton, 2013. https://eprints.soton.ac.uk/360430/.
Pełny tekst źródłaDrozdetski, Aleksander Vladimirovich. "Unexpected mechanical properties of nucleic acids". Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/71660.
Pełny tekst źródłaPh. D.
Palos, Artemio. "Mechanical Properties of Polymer Modified Mortar". Thesis, University of North Texas, 2002. https://digital.library.unt.edu/ark:/67531/metadc3173/.
Pełny tekst źródłaSoliman, Hazem. "Mechanical Properties of Cellular Core Structures". Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/70456.
Pełny tekst źródłaPh. D.
Trevett, Adrian S. "The mechanical properties of hydrogel polymers". Thesis, Aston University, 1991. http://publications.aston.ac.uk/9692/.
Pełny tekst źródłaLawson, Nathaniel C. "Mechanical properties of dental impression materials". Birmingham, Ala. : University of Alabama at Birmingham, 2007. https://www.mhsl.uab.edu/dt/2008r/lawson.pdf.
Pełny tekst źródłaAjwani, Anita. "Mechanical properties of bio-absorbable materials". Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-12042009-020133/.
Pełny tekst źródła