Tesis sobre el tema "Mechanical properties of material"
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Robertson, Alec 1974. "Material properties of actin filament bundles". Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/46628.
Texto completoIncludes bibliographical references (p. 119-127).
Actin is an ubiquitous structural protein fundamental to such biological processes as cell motility and muscle contraction. Our model system is the acrosomal process of the Limulus sperm which extends a 60 ýtm long actin bundle during reproduction. It is an example of a biological spring where the force of elongation derives from twist energy stored within the bundle during spermatogenesis. In addition to actin the acrosome comprises only one other protein: scruin, an actin-binding protein specific to Limulus that decorates and crosslinks actin filaments into a crystalline bundle. Our goal is to reconstitute the structure of the acrosome using these two proteins in order to further elucidate the role of scruin in actin bundle crosslinking.A multi-scale approach is presented wherein the bending rigidity of scruin bundles and their constituent filaments are probed individually, then inter-related by simple mechanical models. Material properties of filaments and bundles are measured using a combination of optical tweezers, electron and fluorescence microscopy. We find that scruin bundles reconstituted from acrosome fragments display an ordered structure, with a bending rigidity orders of magnitude higher than their individual filaments. Actin bundles formed by depletion exhibit similar behavior, revealing an intrinsic regime of coupled actin bundle formation. Bundle elastic moduli are eight orders of magnitude stiffer than reconstituted networks and an order of magnitude softer than the native acrosome, highlighting scruin's ability to dictate a wide range of material properties depending on the formation conditions.
by Alec P. Robertson.
Ph.D.
Wiedenman, Nathan Scott. "Towards programmable materials : tunable material properties through feedback control of conducting polymers". Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/45889.
Texto completoIncludes bibliographical references (p. 159-168).
Mammalian skeletal muscle is an amazing actuation technology that can controllably modify its force and position outputs as well as its material properties such as stiffness. Unlike muscle, current engineering materials are limited by their intrinsic properties, dictated at the molecular level.This work is focused on developing an integrated device, called a programmable material, which mirrors the capabilities of natural co-fabricated controlled actuation systems such as muscle. While such a device may have the external appearance of a homogeneous material, it can possess unique properties not existing in any currently manufactured material. When actuation, sensing, and control capabilities are integrated within a closed-loop system, the mechanical properties of the system such as stiffness, viscosity, and inertia will arise from the dynamics of the feedback loop rather than from any inherent mechanical properties of the materials from which the device was fabricated. Moreover, these properties may be 'tuned' by altering the feedback parameters embedded in the material system. With this approach properties such as negative stiffness may be generated which do not exist in bulk materials.The most promising of the existing artificial muscle technologies is actuation with conducting polymer. Additionally, conducting polymer has been used to fabricate the position sensor and control electronics. Creating these components from a single type of material has made it possible to co-fabricate the system into an integrated device. This is the first research to attempt to create a co-fabricated, fully integrated conducting polymer feedback device. This work establishes the feasibility of building the device and answers many of the questions of fabrication and design.
by Nathan Scott Wiedenman.
Ph.D.
Kappiyoor, Ravi. "Mechanical Properties of Elastomeric Proteins". Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/54563.
Texto completoPh. D.
Salahshoor, Pirsoltan Hossein. "Nanoscale structure and mechanical properties of a Soft Material". Digital WPI, 2013. https://digitalcommons.wpi.edu/etd-theses/924.
Texto completoDimas, Leon Sokratis Scheie. "Effective mechanical Properties of material models with random heterogeneities". Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/103706.
Texto completoCataloged from PDF version of thesis.
Includes bibliographical references (pages 191-198).
In this thesis we obtain analytical approximations to the probability distribution of the elastic tensor and fracture strengths of material models with random heterogeneities. We start by investigating the effective elastic properties of one-, two-, and three-dimensional rectangular blocks whose Young's modulus varies spatially as a lognormal random field. We decompose the spatial fluctuations of the Young's log-modulus F = In E into first- and higher-order terms and find the joint distribution of the effective elastic tensor by multiplicatively combining the term-specific effects. Through parametric analysis of the analytical solutions, we gain insight into the effective elastic properties of this class of heterogeneous materials. Building on this analysis we find analytical approximations to the probability distribution of fracture properties of one-dimensional rods and thin two-dimensional plates for systems in which: only the Young's modulus varies spatially as an isotropic lognormal field and more generally, both the Young's modulus and the local material strength vary spatially as possibly correlated lognormal fields. The properties considered are the elongation, strength, and toughness modulus at fracture initiation and at ultimate failure. For all quantities at fracture initiation our approach is analytical in I D and semi-analytical in 2D. For ultimate failure, we quantify the random effects of fracture propagation and crack arrest by fitting regression models to simulation data and combine the regressions with the distributions at fracture initiation. Through parametric analysis, we gain insight into the strengthening/weakening roles of the Euclidean dimension, size of the specimen, and the correlation, variance and correlation function of the random fields. Finally, we extend the approach to investigate the elasticity of non-lognormal random heterogeneous materials. First we investigate the elastic bulk stiffness of two-dimensional checkerboard specimens in which square tiles are randomly assigned to one of two component phases. This is a model system for multi-phase polycrystalline materials such as granitic rocks and many ceramics. We study how the bulk stiffness is affected by different characteristics of the specimen and obtain analytical approximations to the probability distribution of the effective stiffness. In particular we examine the role of percolation of the soft and stiff phases. In small specimens, we find that the onset of percolation causes significant discontinuities in the effective modulus, whereas in large specimens the influence of percolation is smaller and gradual. Secondly we study the effective stiffness of multi-phase composite systems in which the Young's modulus varies as a filtered Poisson point process and find that the homogenization approach initially developed for lognormal systems produces accurate results also for this class of non-lognormal systems.
by Leon Sokratis Scheie Dimas.
Ph. D.
Engman, Alexander. "Mechanical properties of bulk alloys and cemented carbides". Thesis, KTH, Materialvetenskap, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-230897.
Texto completoAnv¨andandet av kobolt (Co) som bindefas-material i h°ardmetall har blivit ifr°agasatt som en f¨oljdav av de potentiella h¨alsoriskerna associerade med inhalering av koboltpartiklar. Kobolt anv¨ands p°agrund av dess utm¨arkta vidh¨aftande och v¨atande egenskaper, kombinerat med tillr¨ackliga mekaniskaegenskaper. Syftet med detta arbete ¨ar att unders¨oka de mekaniska egenskaperna hos Fe-Ni bulklegeringarochWC-Co h°ardmetall genom att anv¨anda Integrated Computational Materials Engineering(ICME) metoder kombinerat med FEM-data. Rapporten unders¨oker de mekaniska egenskapernahos flera bulklegeringar i Fe-Ni systemet. FEM-indentering och FEM-fraktur data interpoleras ochanv¨ands f¨or att modellera h°ardheten H och brottsegheten KIc. En modell f¨or utskiljningsh¨ardningbaserad p°a Ashby-Orowans ekvation implementeras f¨or att f¨oruts¨aga e↵ekten p°a brottgr¨ansen av utskiljdapartiklar. ¨Aven en modell f¨or l¨osningsh¨ardning implementeras. Existerande modeller anv¨andsf¨or att simulera egenskaperna hos WC-Co h°ardmetall tillsammans med modellen f¨or l¨osningsh¨ardning.Resultaten visar att de simulerade egenskaperna hos Fe-Ni bulklegeringar ¨ar j¨amf¨orbara medde f¨or kobolt. Dock kan de inte bekr¨aftas p°a grund av avsaknad av experimentell data. Egenskapernahos WC-Co h°ardmetall st¨ammer rimligt ¨overens med existerande experimentell data, meden genomsnittlig avvikelse av h°ardheten med 11.5% och av brottsegheten med 24.8%. Slutsatserna¨ar att det beh¨ovs experimentell data f¨or Fe-Ni bulklegeringar f¨or att kunna verifiera modellernasnoggrannhet och att det ¨ar m¨ojligt att f¨oruts¨aga egenskaperna hos h°ardmetall.
Parenti, Cristina. "VARIATION OF THE LOCAL MATERIAL PROPERTIES OF AORTA". Master's thesis, Temple University Libraries, 2010. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/70843.
Texto completoM.S.E.
Understanding the aortic wall deformation and failure during traumatic aortic rupture (TAR), which is a leading cause of fatality in motor vehicle accidents is of great concern. The specific objective of the present study is to develop a material model that can describe the multi layer nature of the aortic wall. Fundamentally, the aortic wall is composed mainly of three layers, tunica intima, media and adventitia, and they are known to have different structures. Understanding the material properties of these layers is essential in order to study the local mechanisms of deformation, force transmission, and failure. The hypothesis of this study is that the tissue's instantaneous shear modulus grows along the radial direction while moving from the intima toward the adventitia. The higher compliance of the tissue near the intima, which is partly due to the concentration of the smooth muscle cells and partly due to the arrangement of collagen and elastin fibers, can explain the nature of aorta failure which is primarily generated from the inside towards the outer layers. A combination of micro- and nano-indentation tests were used to measure the local material properties of porcine aorta at the length scales of 160 µm and 40 µm respectively. The material properties of aorta were investigated in the lateral (left) region in several longitudinal locations of the descending aorta and the observed viscoelastic behavior was summarized in the form of instantaneous shear moduli and reduced relaxation functions. The instantaneous shear modulus was found to generally increase along the radial direction to about 0.6 normalized radial distance and then became almost constant but with higher variability. The reduced relaxation functions were generally independent of the location and test method. Comparing the mechanical results with the histological results obtained through Van-Guisen staining showed that the material properties are partly related to the distribution of smooth muscle cells. The results of this study can be used to explain the mechanisms of failure in aorta and contribute to improve the computational modeling of aorta's deformation which is valuable in a variety of applications including automotive accidents, endovascular grafts, and angioplasty.
Temple University--Theses
Kylström, Sanna. "The Effect of Twinning on the Mechanical Properties of Alloy 825". Thesis, KTH, Materialvetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-254760.
Texto completoTvillingbildning är ett känt fenomen inom materialvetenskap, men hur hör tvillingar, kornstorlek och sträckgräns ihop? Finns det ett samband? Undersökningar utförs med ett ljusoptiskt mikroskop för legering 825 på 19 prover, för att räkna ut tvillingfraktionen och kornstorleken. Detta jämförs sedan med sträckgränsen som man tillhandahåller från dragprov. Proverna har olika reduktion av sin dimension genom valsning och har glödgats olika tider. Det visar sig att tvillingbildning gör legering 825 något mjukare och mer duktil på en mindre skala, eftersom tvillingfraktionen ökar då sträckgränsen sjunker. Dock ökar även kornstorleken när sträckgränsen minskar, vilket är viktigt att tänka på när det kommer till sambandet mellan kornstorlek, tvillingar och sträckgräns.
Uberti, Megan E. "Exploring the material properties of small scale folded structures". Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/83750.
Texto completoCataloged from PDF version of thesis.
Includes bibliographical references (page 21).
make robotics more readily available to the average person. Although designs for a number of successful printable robots have already been produced, there has been little formal exploration into the materials properties of these structures. Three point bending tests were performed on beams made of the materials and cross-sectional geometries of current designs to determine the bending stiffness of the printable beams currently found in printable robots, particularly the printable quad-rotor frame. As expected the composite acrylic and PEEK triangular beam had the highest bending stiffness El at 4.15 ± 1.67 N*m2. The lowest El was the triangular PEEK beam in its weak configuration at 0.02 ± 0.005 N*m2. 3D printed ABS beams had an unreliable result, with El in the range of 11.7 ± 8.05 N*m2. Overall our experimentally calculated values for El were generally consistent with the theoretically calculated values, providing useful information to inform future design choices and understanding the limitations of printable robot structures.
by Megan E. Uberti.
S.B.
HASSAN, INAMUL. "Effects of Austempering Process on Mechanical Behavior Properties of Compacted Graphite Iron". Thesis, Tekniska Högskolan, Högskolan i Jönköping, JTH, Material och tillverkning, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-45645.
Texto completoXavier, Angela Marie. "Determination of the Material Properties of the Pediatric Rib". The Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=osu1392019115.
Texto completoHarris, Trudy Katherine. "The mechanical properties of ultrahard materials at elevated temperatures". Thesis, University of Hull, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363188.
Texto completoEshetu, Tefera Zegeye. "Impact Acoustic Testing for Classification of CGI Mechanical and Material properties". Thesis, KTH, Industriell produktion, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-140320.
Texto completoBlackwell, Bryan E. (Bryan Ellis). "A framework for determining the mechanical properties of dissimilar material joints". Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/11245.
Texto completoZhao, Jingyi Zhao. "Relating Grain Boundaries to the Mechanical Properties of Polycrystalline Material: Gradient Nanocrystalline Material and Electro-Plasticity". University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron153296020243128.
Texto completoVenugopal, Vysakh. "Design of Multi-Material Lattice Structures with Tailorable Material Properties using Density-Based Topology Optimization". University of Cincinnati / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1553252070840125.
Texto completoYeh, Chih-chiang. "Evaluation of material properties and friction data in metalforming". Ohio : Ohio University, 1989. http://www.ohiolink.edu/etd/view.cgi?ohiou1182179682.
Texto completoPark, Christina Soyeun 1980. "Characterizing the material properties of polymer-based microelectrode arrays for retinal prosthesis". Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/89907.
Texto completoValero, Diana (Diana E. ). "Compression testing and measurement of material properties of a double network hydrogel". Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/98758.
Texto completoCataloged from PDF version of thesis.
Includes bibliographical references (page 26).
Double network hydrogel samples were synthesized and manufactured out of polyacrylamide (PAAm) and alginate solutions. They were casted into cube molds with each side measuring 20 mm. Samples were tested under compressive loads in cyclic compression tests and stress relaxation tests. A viscoelastic model was applied and material properties were calculated using the experimental data. The elastic modulus of these PAAm-alginate gels was found to be 35kPa, while the viscosity, [eta], was found to be 1.43 kPa-s. The viscous response was found to have a dependency on the strain rate by an exponential factor of 0.26. Using the applied theoretical model and the experimentally determined material properties, you can then characterize the mechanical response of the PAAm-alginate hydrogel when it undergoes small strains.
by Diana Valero.
S.B.
Bhanbhro, Riaz. "Mechanical Properties of Tailings : Basic Description of a Tailings Material from Sweden". Licentiate thesis, Luleå tekniska universitet, Geoteknologi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-16952.
Texto completoGodkänd; 2014; 20140818 (riabha); Nedanstående person kommer att hålla licentiatseminarium för avläggande av teknologie licentiatexamen. Namn: Riaz Bhanbhro Ämne: Geoteknik/Soil Mechanics and Foundation Engineering Uppsats: Mechanical Properties of Tailings Basic Description of a Tailings Material from Sweden Examinator: Professor Sven Knutsson, Institutionen för samhällsbyggnad och naturresurser, Luleå tekniska universitet Diskutant: Adjungerande professor Peter Viklander, Vattenfall AB, Luleå Tid: Torsdag den 18 septemebr 2014 kl 10.00 Plats: F1031, Luleå tekniska universitet
Yoon, Se-Young. "Bonding Material Coated Clay for Improving Paper Properties". Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/14540.
Texto completoKhan, Saadika B. "Mechanical and handling properties of light-cured acrylic resin custom tray material". Thesis, University of the Western Cape, 2007. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_4268_1227009157.
Texto completoBoth light-cured (LC) and chemically-cured (CC) acrylic resin custom tray materials are used at the Oral Health Centre, Faculty of Dentistry, University of the Western Cape. At present, the CC acrylic is the standard for formal undergraduate teaching and training. The LC material is not part of routine didactic teaching as little evidence-based scientific information is available with regards to its properties and its usage in the clinical environment. Negative effects have caused researchers to focus on alternatives and to research for other materials with more advantageous properties. The objectives of this study was to determine the linear dimensional shrinkage and fracture toughness of light-cured acrylic custom tray materials and compare it to the chemically-cured type. Also to evaluate the acceptance of light-cured acrylic resin custom trays by undergraduate students.
Agbisit, Roderick Nazario Malcaba. "Relationships between material properties and microstructure-mechanical attributes of extruded biopolymeric foams". Diss., Manhattan, Kan. : Kansas State University, 2007. http://hdl.handle.net/2097/334.
Texto completoDaniel, Geoffrey Morrall. "Evaluation of material properties of mechanically alloyed SUS304L with Zr addition". Kyoto University, 2019. http://hdl.handle.net/2433/242327.
Texto completoForskitt, M. "A computer modelling of some mechanical properties of perforated and porous materials". Thesis, University of Nottingham, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381214.
Texto completoHemmasizadeh, Ali. "Characterization of Heterogeneous Material Properties of Aorta Using Nanoindentation". Diss., Temple University Libraries, 2013. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/240046.
Texto completoPh.D.
Arterial mechanical properties have received increasing attention in the past few decades due to their vast effect on predicting cardiovascular diseases and injuries. The heterogeneity of thoracic aortic tissue was characterized in terms of viscoelastic material properties and correlations were obtained between these properties and tissue morphology. Additionally, the effect of material preservation on the material properties was determined. Changes in the mechanical properties of porcine thoracic aorta wall in the radial direction were characterized using a quasi-linear viscoelastic modeling of nanoindentaiton tests. Two layers of equal thickness were mechanically distinguishable in descending aorta based on the radial variations in the instantaneous Young's modulus E and reduced relaxation function G(t). Overall, comparison of E and Ginf of the outer half (70.27±2.47 kPa and 0.35±0.01) versus the inner half (60.32±1.65 kPa and 0.33±0.01) revealed that the outer half was stiffer and showed less relaxation. The results were used to explain local mechanisms of deformation, force transmission, tear propagation and failure in arteries. A multimodal and multidisciplinary approach was adopted to characterize the transmural morphological properties of aorta. The utilized methods included histology and multi-photon microscopy for describing the wall micro-architecture in the circumferential-radial plane, and Fourier-Transform infrared imaging spectroscopy for determining structural protein, and total protein content. The distributions of these quantified properties across the wall thickness of the porcine descending thoracic aorta were characterized and their relationship with the mechanical properties was determined. It was revealed that there is an increasing trend in mechanical stiffness, Elastic lamella Density (ELD), Structural Protein (SPR), Total Protein (TPR), and Elastin and Collagen Circumferential Percentage (ECP and CCP) from inner layers toward the outer ones. Finally two larger regions with equal thickness (inner and outer halves) were determined based on cluster analysis results of ELD which were in agreement with the cluster analysis of instantaneous Young's modulus. Changes to the local viscoelastic properties of fresh porcine thoracic aorta wall due to three common storage temperatures (+4 oC, -20 oC and -80 oC) within 24 hours, 48 hours, 1 week and 3 weeks were characterized. The changes to both elastic and relaxation behaviors were investigated considering the multilayer, heterogeneous nature of the aortic wall. For +4 oC storage samples, the average instantaneous Young's modulus (E) decreased while their permanent average relaxation amplitude (Ginf) increased and after 48 hours these changes became significant (10%, 13% for E, Ginf respectively). Generally, in freezer storage, E increased and Ginf showed no significant change. In prolonged preservation (> 1 week), the results of +20 oC storage showed significant increase in E (20% after 3 weeks) while this increase for -80 oC was not significant, making it a better choice for tissue cold storage applications. Results from this dissertation present a substantial step toward the anatomical characterization of the aortic wall building blocks and establishing a foundation for understanding the role of microstructural components on the functionality of blood vessels. A better understanding of these relationships would provide novel therapeutic targets and strategies for the prevention of human vascular disease.
Temple University--Theses
Zander, Johan. "Modelling mechanical properties by analysing datasets of commercial alloys". Licentiate thesis, Stockholm : Industriell teknik och management, Kungliga Tekniska högskolan, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4527.
Texto completoEriksson, Daniel. "Wood - an anatomical structure in the tree and an engineering material in industry : prediction of material properties in managed Scots pine stands in the forest /". Umeå : Dept. of Forest Ecology and Management, Swedish University of Agricultural Sciences, 2008. http://epsilon.slu.se/200873.pdf.
Texto completoVara, Amit Rashiklal. "Determination of material properties of mild steel at different temperatures and strain rates". Master's thesis, University of Cape Town, 2007. http://hdl.handle.net/11427/5458.
Texto completoIncludes bibliographical references.
Quantification of material properties through physical experiments is of significant importance. Test data from such experiments aid in the understanding of the material behaviour when exposed to a variety of loading conditions. Such data also help in the formulation of empirical and constitutive relations that can be applied in numerical simulations. This project dealt with the determination of the variation of the yield stress of mild steel with temperature and strain rate. This was achieved by carrying out high temperature tensile tests at different strain rates on mild steel specimens. These experiments also helped set a methodology for carrying out high temperature tensile tests using a servohydraulic universal tester. Results from the tests indicated that increases in temperature tended to decrease the yield stress, whereas increases in strain rate had the opposite effect. This was found to be consistent with data found in literature. It was also noted that the temperature effect was more dominant than the strain rate effect over quasi-static strain rates.
Chopra, Prateek. "Effective mechanical properties of lattice materials". Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/39436.
Texto completoLawson, 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.
Texto completoAjwani, Anita. "Mechanical properties of bio-absorbable materials". Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-12042009-020133/.
Texto completoSparnins, Edgars. "Mechanical properties of flax fibers and their composites". Doctoral thesis, Luleå, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26640.
Texto completoGodkänd; 2009; 20091029 (edgspa); DISPUTATION Ämnesområde: Polymera konstruktionsmaterial/Polymeric Composite Materials Opponent: Docent Kristofer Gamstedt, Kungliga Tekniska Högskolan, Stockholm Ordförande: Docent Roberts Joffe, Luleå tekniska universitet Tid: Onsdag den 9 december 2009, kl 10.00 Plats: E 231, Luleå tekniska universitet
Wang, Zhixin. "Polydimethylsiloxane Mechanical Properties Measured by Macroscopic Compression and Nanoindentation Techniques". Scholar Commons, 2011. http://scholarcommons.usf.edu/etd/3402.
Texto completoZadhoush, Ali. "The influence of defects on the mechanical properties of short fibre reinforced thermoplastics". Thesis, Brunel University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.255673.
Texto completoJohansson, Frida y Johanna Klarin. "Mechanical properties of trabecular structures produced by SLM, as a function of the trabecular morphology". Thesis, Tekniska Högskolan, Högskolan i Jönköping, JTH, Produktutveckling, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-36593.
Texto completoAppelsved, Peter. "Investigation of Mechanical Properties of Thermoplastics with Implementations of LS-DYNA Material Models". Thesis, KTH, Hållfasthetslära (Inst.), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-103790.
Texto completoAlbakri, Isra Abdelkarim Moh'd. "Fluoride release, mechanical properties and biological interaction of a modified denture base material". Thesis, The University of Sydney, 2014. http://hdl.handle.net/2123/12855.
Texto completoSánchez, Vivas Lorena. "Bamboo as a Sustainable Engineering Material: Mechanical Properties, Safety Factors, and Experimental Testing". Scholar Commons, 2019. https://scholarcommons.usf.edu/etd/7925.
Texto completoRomanov, Vasily Vladimirovich. "MATERIAL PROPERTIES OF AORTA FROM BIAXIAL OSCILLATORY TESTS". Master's thesis, Temple University Libraries, 2010. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/117228.
Texto completoM.S.E.
This project addresses characterization of the material properties of aortic tissue. Understanding of these properties is important for a variety of studies including tissue engineering, effects of aging and diseases, stents engineering, and traumatic aorta rupture. The goal of the presented research was to characterize the stress-strain relationship of aorta in dynamic oscillatory biaxial loading. A setup was developed that supplied pressure loading from the physiological to sub-failure levels (between 7 and 76 kPa) to porcine aorta at frequencies ranging from 0.50Hz to 5.00Hz. Samples tested were constrained at both ends while the deformation and the pressure were recorded. Volumetric strain versus pressure was used to characterize the structural behavior of the material which showed frequency dependency and hysteresis indicating viscoelastic response. An offset method was developed to account for drifting behavior exhibited by some of the samples. The structural behavior of aorta was modeled using a quasi-linear viscoelastic (QLV) creep theory. The QLV model included a logarithmic steady state elastic function v = 0.663 +/- 0.040 + 0.241 +/- 0.011 ln(P) for pressure in kPa, and a Prony series creep function ( J0 = 0.472 +/- 0.021, J2 = 0.109 +/- 0.060, J3 = 0.419 +/- 0.056). Modeling results were then used to determine the relationships between the circumferential and longitudinal stresses and strains of the material. The results exhibited that the stress in the transverse direction was about 1.5 times larger than in the axial direction. However, in the axial direction material was stiffer and the deformation was 30% less. The relaxation function of the material was determined by linearizing the non-linear component of the QLV model and applying to it the linear viscoelastic theory. Furthermore, literature comparison revealed that aorta's creep function, as well as its elastic modulus, is within the range of what has been reported in the literature. In conclusion, an experimental model was developed that can be used to predict the behavior of porcine aorta under physiological and sub-failure conditions at quasi-static and dynamic loading.
Temple University--Theses
Wang, Shuyue. "Material Properties of Adhesive Joint". Thesis, KTH, Hållfasthetslära, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-277865.
Texto completoUtvecklingen av den kommersiella 5G-nätverk med högfrekvent signaler sätter krav för en tätare basstationsnät, vilket i sin tur behöver mindre och mer diskreta produkter. Ett sätt att combinera material med olika egenskaper och samtidigt försöka minimera produktsstorleken är att ersätta skruvförband med limförband. Detta masterexamensarbete handlar om att undersöka materialbeteende hos limfog och att bestämma dess materialmodell. Limfogd kan beskrivas som ett temperaturberoende material med både hyperelastiskt och viscoelastiskt materialbeteende. En relaxationstest genomfördes för att utvärdera limfogens beteende och dess temperaturberoende egenskaper. Testresultaten visade att Neo Hookean och Generalized Maxwell material modellen kan användas för att beskriva de grundläggande materialegenskaperna hos limfogen. Under cyklisk last initierades skadan i limfog där materialets styvhet minskades med antal ökade lastcykel. Minskningen av styvheten vid den första lastcykel kan beskrivas med Mullins effekt. När limfogens tjocklek är lika med den applicerade förskjutning, visades ingen synlig skada. Däremot om tjockleken är mindre än den applicerade förskjutning, kan total brott i limfogen identifieras med små reaktionskraft och diskontinuitet i kraftförskjutningskurvan.
Root, Samuel E. "Mechanical Properties of Semiconducting Polymers". Thesis, University of California, San Diego, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10745535.
Texto completoMechanical 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.
Gustafsson, Jesper y Mikael Landberg. "Production of bio-plastic materials from apple pomace : A new application for the waste material". Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-21216.
Texto completoGernhardt, Marvin. "Multi-material microstructures with novel stimuli-responsive properties". Thesis, Queensland University of Technology, 2021. https://eprints.qut.edu.au/210195/1/Marvin_Gernhardt_Thesis.pdf.
Texto completoPark, Jin Young. "Pultruded composite materials under shear loading". Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/32865.
Texto completoBertolla, Luca. "Mechanical Reinforcement of Bioglass®-Based Scaffolds". Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-234586.
Texto completoNährström, Elin. "Relation between microstructure features, cooling curves and mechanical properties in CGI-cylinder block". Thesis, KTH, Materialvetenskap, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-160819.
Texto completoSingaraju, Aditya Bharadwaj. "Crystallographic and spectroscopic assessment of pharmaceutical material mechanics". Diss., University of Iowa, 2018. https://ir.uiowa.edu/etd/6643.
Texto completoHorn, Etienne. "The calibration of material properties for use in discrete element models". Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/20088.
Texto completoENGLISH ABSTRACT: One of the main challenges in using the Discrete Element Method (DEM) is to specify the correct input parameter values. In general, the models are sensitive to the input parameter values and accurate results can only be achieved if the correct values are specified. For the linear contact model, micro parameters such as the particle density, stiffness, coefficient of friction, as well as the particle size and shape distributions are required. Thus, there is a need for a procedure to accurately calibrate these parameters before any attempt can be made to accurately model a complete bulk materials handling system. Since the DEM is often used to model applications in the mining and quarrying industries, a calibration procedure was developed for materials that consist of relatively large (up to 40 mm in size) particles. A coarse crushed aggregate was used as the test material. Using a specially designed large scale shear box, the confined Young’s Modulus and internal friction angle of the material were measured by means of the confined compression test and the direct shear test respectively. The bulk (macro) density and porosity were also measured. The particle size distribution was measured while visual inspection was used to identify the different particle shapes. DEM models of the experimental set-up were developed and the input parameter values were varied iteratively until a close correlation between the experimental and numerical results was achieved. The resulting set of input parameter values were then verified through a series of anchor pull-out and angle of repose experiments and simulations. A good correlation between the experimental and numerical results was observed. In a study, independent of the calibration process, a half fraction factorial design was implemented to quantify the effect of the input parameter values on the bulk properties and to construct multiple linear regression models that relate the parameters to the bulk properties. The results were found to be in accordance with expected bulk behaviour, and can be used to develop advanced DEM calibration strategies. Based on the project outcomes, it was concluded that the developed calibration procedure performed satisfactorily and that the calibrated input parameters allow for the accurate modelling of the coarse aggregate.
AFRIKAANSE OPSOMMING: Een van die groot uitdagings in die gebruik van die Diskreet Element Metode (DEM) is om die korrekte invoer parameterwaardes te spesifiseer. Die modelle is in die algemeen sensitief vir die invoer parameterwaardes, en akkurate resultate kan slegs verkry word indien die korrekte waardes gespesifiseer word. Mikroparameters soos partikeldigtheid, styfheid, wrywingskoëffisiënt, die partikelgrootte verspreiding asook die partikelvorm verspreiding, word benodig vir die lineêre kontakmodel. ’n Prosedure word dus benodig om hierdie parameters akkuraat te kalibreer alvorens ’n volledige korrelagte materiaalhanteringstelsel akkuraat gemodelleer kan word. Aangesien die DEM gereeld in die modellering van myn- en gruisgroefbedryf toepassings gebruik word, is ’n kalibrasieprosedure ontwikkel vir materiaal wat bestaan uit relatief groot (tot 40 mm in grootte) partikels. Grofgebreekte klippe is as toetsmateriaal gebruik. Deur gebruik te maak van ’n spesiaal ontwerpte grootskaal-skuifboks is die ingeperkte Young se Modulus en die interne wrywingshoek van die materiaal gemeet deur middel van die ingeperkte kompressietoets en die direkte skuiftoets onderskeidelik. Die makro-digtheid en poreusheid is ook gemeet. Die partikelgrootte verspreiding is gemeet terwyl visuele inspeksie gebruik is om die verskillende partikelvorms te identifiseer. DEM modelle van die eksperimentele opstelling is ontwikkel en die invoer parameterwaardes is herhaaldelik gewysig totdat ’n goeie korrelasie verkry is tussen die eksperimentele en numeriese resultate. Die gevolglike stel invoer parameterwaardes is daarna geverifieer deur ’n reeks ankeruittrek- en natuurlike helling eksperimente en simulasies. In ’n studie, onafhanklik van die kalibrasieproses, is die half-fraksie faktoriaalontwerp geïmplementeer om die invoer parameterwaardes se effek op die makro eienskappe te kwantifiseer en om meervoudige lineêre regressiemodelle te ontwikkel wat die parameters met die makro eienskappe verbind. Die resultate was in ooreenstemming met die verwagte makro gedrag en kan gebruik word om gevorderde DEM kalibrasie-strategieë te ontwikkel. Daar is tot die gevolg gekom dat, gebaseer op die projekresultate, die ontwikkelde kalibrasieprosedure bevredigend presteer en dat die gekalibreerde invoer parameters die akkurate modellering van die grofgebreekte klippe toelaat.
Koch, Timothy David. "Device for selecting lightwave ranges via computer control for studying building material properties via goniophotometer". Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/40440.
Texto completo"June 2007."
Includes bibliographical references (p. 21).
To enable the fast and accurate cataloging of material samples, I designed a filtration device for selecting specific visible and near-infrared light wavelengths related to the red, green, and blue sensitivity peaks of a visible detection camera and the pixel response for a near-infrared camera. This filter device functions in conjunction with the Department of Architecture's Daylighting Laboratory goniophotometer to profile the complete reflection and transmission properties for sample building materials. The resulting data is used in computer simulations and material optimization. The goniophotometer uses two types of detection cameras, color and infrared, to measure the light that is transmitted or reflected off a sample of material. The spectral sensitivity variances of the cameras create inaccuracies in the resulting data when full-spectrum light is used. To remove these inaccuracies, the light is filtered into smaller sections of the full spectrum and the data is recombined by software, to remove these inaccuracies. The device to filter the light is the subject of this thesis. The final filter design uses a geneva drive to index wheels containing pairs of high-pass and low-pass filters into the light path between the light source and the test specimen.
(cont.) The device satisfies the design specifications dictated by the usability, function and spatial constraints. This design should prove to be very reliable and flexible through its continued use in studying building materials. As the project is advanced, future work includes installation of the control system and integration into the software used to coordinate the goniophotometer components.
by Timothy David Koch.
S.B.