Dissertations / Theses on the topic 'Sisal (Fiber) - Mechanical properties'
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Oliveira, Fernando de. "Lignopoliuretanos: preparação, caracterização e aplicação em compósitos de sisal." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/75/75134/tde-25022015-082454/.
The rational valuing of lignin and its derivatives is one of the major challenges in the biorefinery context where these macromolecules are generated as byproducts. Lignosulfonates obtained through the wood sulfite pulping process are produced on a large scale. However, they are rarely used as reagents in the preparation of macromolecular compounds. The presence of OH groups in their structure allows their use as a macromonomer to obtain polyurethanes (PU). This study aimed at obtaining lignopolyurethanes and composites based mainly on raw materials obtained from renewable sources. Castor oil (CO) and sodium lignosulfonate (NaLS), both derived from renewable raw materials, were used in different compositions as replacements for conventional polyols along with diphenylmethane diisocyanate (MDI) in the PU synthesis. Initially, polyurethanes were prepared from NaLS and other polyols such as diethylene glycol (DEG), polyethylene glycol (PEG), and OM, as well as by using these reagents, except for NaLS (control samples). In order to increase the reactivity of the OH groups of NaLS against isocyanates in the lignopolyurethanes synthesis, NaLS was oxypropylated (reaction with propylene oxide, generating LS-Oxy) and hydroxyalkylated (reaction with formaldehyde and glutaraldehyde, generating NaLS-Glu-For NaLS, respectively). The use of aldehydes in the NaLS modification, as far as we know, is a novel approach with regard to the lignopolyurethane synthesis. The products (LS-Oxy, NaLS-Glu, and NaLS-For) were characterized by infrared spectroscopy (IR) and associated or not with CO were also used in lignopolyurethanes preparation (also characterized by IR). Lignocellulosic fibers extracted from sisal (Agave sisalana), which has Brazil as its largest producer in the world, were used as reinforcement for the prepared lignopolyurethanes. Lignopolyurethanic composites and the non-reinforced lignopolyurethanes were characterized by thermogravimetric analysis (TG), impact test, flexural strength, scanning electron microscopy (SEM) and dynamic mechanical analysis (DMA). Results showed that sisal fibers substantially increased the impact strength of all lignopolyurethanes. Among the composites based on unmodified NaLS (Group 1), DEG/NaLS/MDI/Sisal showed the best impact strength (472 J m-1) and the best flexural strength (47 MPa). When the oxypropylated NaLS was used (Group 2), the composite
LS-Oxy/MDI/Sisal showed impact strength of 459 J m-1 and flexural strength of 43 MPa, while the composite NaLS-Glu/MDI/Sisal prepared from the hydroxyalkylated NaLS (Group 3) showed impact strength of 945 J m-1 and flexural strength of 23 MPa. The SEM images of the fracture surface after the impact test revealed a strong adhesion in the fiber/matrix interface as a consequence of the presence of hydrogen bonds between the urethane groups of the matrix and the hydroxyl groups of the fibers, in addition to the interactions between the hydrophobic domains of both fiber and matrix. Materials with different degrees of crosslinking and characteristics from elastomeric to thermoset were obtained from the use of NaLS and CO, which makes them attractive for different applications such as automotive parts and panels for architectural use. In general, materials with excellent properties and prepared with a high proportion of renewable raw materials were developed, thus meeting the current expectations concerning biobased materials.
Vasco, Marina Cardozo. "Efeito da radiação gama sobre as propriedades mecânicas de compósito de fibras de sisal/poliuretana sem uso de agentes de acoplamento." Universidade Tecnológica Federal do Paraná, 2014. http://repositorio.utfpr.edu.br/jspui/handle/1/1067.
Natural fiber composites with polymeric matrix has been the focus of studies by having good mechanical properties and low weight, which allows its use in various environments, including hospital, radiotherapy and radiology rooms. Its major difficulty is the lack of affinity of the component materials, causing detachment of the interface and lower load transfer between matrix and reinforcement. An alternative may be composites based on natural fibers and polyurethane derived from castor oil. The incidence of radiation can lead to degradation of polymeric material and change its mechanical properties. The objective of this study was to obtain and characterize composites of dispersed sisal fibers and sisal fabric with polyurethane matrix based on castor oil without addition of compatibilizing agents, which may be used in environments that receive radiation at high intensity. The composites were obtained by cold pressing, irradiated with gamma radiation, dose of 25 kGy, and evaluated before and after irradiation with thermal, infrared, surface and mechanical testing. It was observed that there may be chemical affinity between the reinforcing material and the matrix, since was not observed detachment from the fiber / polymer interface. The materials can be considered hydrophilic by contact angle analysis. Maximum values of bending stress of 80.33 MPa and elastic modulus in bending of 4.40 GPa for the sisal fabric / polyurethane composite without irradiation were obtained, such as impact resistance of 13.14 kJ / m2 for the dispersed sisal fibers composite after irradiation. It can be concluded that the materials are suitable for use in radiotherapy and radiology rooms.
Coetzee, Gerrit. "The mechanical and volumetric behaviour of sisal fibre reinforced concrete blocks." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/80010.
ENGLISH ABSTRACT: Natural fibre reinforced concrete (NFRC) is a type of concrete that has become of particular interest in recent years, due to its potential for being used as a sustainable and economically viable building material. Natural fibres are often cheap and widely available in developing nations. Sisal is one such fibre predominantly grown in Brazil and has been identified as having the potential to be commercially cultivated in Southern Africa. The durability of sisal fibres in a cementitious environment tends to be adversely affected due to the high alkalinity of pore water and the presence of calcium hydroxide. This research dealt with the use of sisal fibre reinforced concrete (SFRC) blocks. It focused on the mechanical and volumetric properties of blocks with varying fibre and condensed silica fume content (CSF). Two different SFRC blocks were produced (solid and hollow) using an average fibre length of 10 mm. Two matrix types were used: one using a 70:30 cement:fly-ash ratio and another using a 60:30:10 cement:fly-ash:CSF ratio by weight. Samples of each matrix type were prepared with 0, 0.5 and 1% fibre content by volume. Hollow blocks were tested for compressive strength and capillary water absorption, while solid blocks were tested for compressive strength, flexural strength, capillary water absorption, dimensional stability, drying shrinkage, density, total water absorption and void content. All tests were performed on samples with an age of 28 days. Solid block compressive tests were also performed on samples with an age of 7 days. The hollow blocks had significantly lower average compression strength than the solids, but an increase in fibre content caused a slight increase in strength. For solid blocks, it was found that the addition of natural fibres decreases the strength, although a partial substitution of cement with CSF, in conjunction with fibres, did increase the strength relative to blocks without CSF. The flexure strength was also lowered somewhat by the addition of fibres, but an increase in ductility was noted, although not quantified. The addition of CSF to fibre-containing blocks led to an increase in capillary water absorption, but a decrease in absorption through immersion. This shows that the addition of CSF does significantly alter the pore system of a cementitious matrix reinforced with natural fibres. Also, the dimensional stability increased with the addition of CSF and fibres. The same can be said for drying shrinkage. Even though an increase in fibre and CSF caused samples to shrink more under drying, they were more stable under cycles of wetting and drying. It was concluded that the addition of fibres to a matrix had a detrimental effect on strength, although ductility did increase. The volumetric properties of concrete were also adversely affected by the addition of fibres, although dimensional stability was improved. The partial substitution of cement with CSF did improve many of the mechanical and volumetric properties of samples containing sisal fibre.
AFRIKAANSE OPSOMMING: Natuurlike vesel bewapende beton (NVBB) is ’n tipe beton wat onlangs heelwat belangstelling ontlok het weens die potensiaal om gebruik te word as ‘n volhoubare en ekonomiese haalbare boumateriaal. Natuurlike vesels is dikwels baie goedkoop en wyd beskikbaar in ontwikkelende lande. Sisal is een so ‘n vesel wat verkry word vanaf die blare van ’n garingboom. Die plant word hoofsaaklik in Brasilië verbou en is al uitgewys weens sy potensiaal om op kommersiële skaal in Suidelike Afrika verbou te word. Die duursaamheid van sisal vesels is geneig om nadelig geaffekteer te word in die teenwoordigheid van kalsium hidroksied en ’n hoë-alkali omgewing, soos gevind in die porie-water van beton. Hierdie navorsing handel oor die gebruik van sisal vesel bewapende beton (SVBB) boublokke. Dit fokus op die meganiese- en duursaamheids eienskappe van blokke met verkillende inhoude van vesel en gekondenseerde silika dampe (GSD). Twee verskillende SVBB blokke is geproduseer (solied en hol) deur gebruik te maak van 10 mm vesels. Twee matriks tipes is gebruik: een met ’n 70:30 sement:vliegas verhouding en een met ’n 60:30:10 sement:vliegas:GSD verhouding, volgens gewig. Blokke van elke matriks tipe is geproduseer met 0, 0.5 en 1% vesel inhoud, volgens volume. Hol blokke is getoets vir druksterkte en kapillêre water absorpsie, terwyl soliede blokke getoets is vir druksterkte, buigsterkte, kapillêre water absorpsie, dimensionele stabiliteit, krimp onder uitdroging, digtheid, totale water absorpsie en luginhoud. Alle toetse is gedoen op blokke met ’n ouderdom van 28 dae. Druktoetse is ook gedoen op soliede blokke met ’n ouderdom van 7 dae. Die hol blokke het ’n aansienlike laer gemiddelde druksterkte as die soliede blokke gehad, maar ’n toename in veselinhoud het gelei tot ’n effense verhoging in druksterkte. ’n Toename in veselinhoud van soliede blokke het gelei tot ’n afname in druksterkte, alhoewel ’n gedeeltelike vervanging van sement met GSD gelei het tot ’n hoër druksterkte vir blokke met vesels. Die buigsterkte van soliede blokke het ook afgeneem met ’n verhoging in veselinhoud. ’n Verhoging in duktiliteit is waargeneem met ’n toename in veselinhoud, alhoewel dit nie gekwantifiseer is nie. Die toevoeging van GSD tot blokke bevattende vesels het gelei tot ’n verhoging in kapillêre water absorpsie, maar ’n verlaging in totale water absorpsie. Dit kan daarop wys dat die toevoeging van GSD die poriestelsel van NVBB noemenswaardig verander. Beide die dimensionele stabiliteit en krimp onder uitdroging het toegeneem met die toevoeging van GSD en vesels tot die blokke. Dus, die toevoeging het gelei tot ’n hoër krimpvervorming tydens uitdroging en ’n hoër stabiliteit tydens nat/droog siklusse. Daar is tot die gevolgtrekking gekom dat die toevoeging van sisal vesels tot ’n beton blok oor die algemeen ’n negatiewe effek het op sterkte, alhoewel duktiliteit toeneem. Die volumetriese eienskappe van beton word ook negatief geaffekteer met die toevoeging van sisal vesels, alhoewel dimensionele stabiliteit verbeter. Die gedeeltelike vervanging van sement met GSD lei tot die verbetering van beide meganiese en volumetriese eienskappe van beton blokke wat sisal vesels bevat.
Smulski, Stephen John. "Flexural behavior of a glass fiber reinforced wood fiber composite." Diss., Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/53596.
Ph. D.
Yurtseven, Alp Eren. "Determination Of Mechanical Properties Of Hybrid Fiber Reinforced Concrete." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605268/index.pdf.
zgü
r Yaman August 2004, 82 pages Fiber reinforcement is commonly used to provide toughness and ductility to brittle cementitious matrices. Reinforcement of concrete with a single type of fiber may improve the desired properties to a limited level. A composite is termed as hybrid, if two or more types of fibers are rationally combined to produce a composite that derives benefits from each of the individual fibers and exhibits a synergetic response. This study aims to characterize and quantify the mechanical properties of hybrid fiber reinforced concrete. For this purpose nine mixes, one plain control mix and eight fiber reinforced mixes were prepared. Six of the mixes were reinforced in a hybrid form. Four different types of fibers were used in combination, two of which were macro steel fibers, and the other two were micro fibers. Volume percentage of fiber inclusion was kept constant at 1.5%. In hybrid reinforced mixes volume percentage of macro fibers was 1.0% whereas the remaining fiber inclusion was v composed of micro fibers. Slump test was carried out for each mix in the fresh state. 28-day compressive strength, flexural tensile strength, flexural toughness, and impact resistance tests were performed in the hardened state. Various numerical analyses were carried out to quantify the determined mechanical properties and to describe the effects of fiber inclusion on these mechanical properties. Keywords: Fiber Reinforcement, Hybrid Composite, Toughness, Impact Resistance
Zanganeh, Mehdi. "Mechanical properties of fiber reinforced concrete with ACM applications." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0013/MQ52021.pdf.
Mohammed, Hafeez. "Mechanical Properties Of Ultra High Strength Fiber Reinforced Concrete." University of Akron / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=akron1431021338.
Caba, Aaron C. "Characterization of Carbon Mat Thermoplastic Composites: Flow and Mechanical Properties." Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/29104.
Ph. D.
Jiang, Mingxiao. "Scale and boundary conditions effects in fiber-reinforced composites." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/16373.
Kristofek, Grant William 1980. "An instrument for high-throughput measurements of fiber mechanical properties." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/33758.
Includes bibliographical references (leaves 173-177).
In this thesis, an instrument is designed and constructed for the purpose of measuring the mechanical properties of single fibers. The instrument is intended to provide high throughput measurement of single fiber geometric properties, tensile properties, elastic properties, surface roughness properties, friction properties, bending properties, and torsion properties. The instrument is capable of performing all of these mechanical measurements automatically on a large number of sample fibers which are stored in the instrument during testing.
by Grant William Kristofek.
S.M.
Conley, Jill Anne. "Hygro-thermo-mechanical behavior of fiber optic apparatus." Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/17308.
Lavadiya, Dayakar Naik. "Effective Properties of Randomly Oriented Kenaf Short Fiber Reinforced Epoxy Composite." DigitalCommons@USU, 2015. http://digitalcommons.usu.edu/etd/4600.
Berry, Bryne. "Investigation of electrical and impact properties of carbon fiber textile composites." Thesis, University of Iowa, 2014. https://ir.uiowa.edu/etd/4575.
Saka, Kolawole. "Dynamic mechanical properties of fibre reinforced plastics." Thesis, University of Oxford, 1987. http://ora.ox.ac.uk/objects/uuid:0514854d-36db-4cc1-b377-03a75550ab76.
Flynn, Jeff. "Characterization of Mechanical Properties in Hybridized Flax and Carbon Fiber Composites." Thesis, North Dakota State University, 2013. https://hdl.handle.net/10365/27207.
Lu, Yunkai. "Mechanical Properties of Random Discontinuous Fiber Composites Manufactured from Wetlay Process." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/34503.
Master of Science
ARRUDA, FILHO Nivaldo Timóteo de. "Compósitos cimentícios leves utilizando resíduos industriais e fibras de sisal." Universidade Federal de Campina Grande, 2011. http://dspace.sti.ufcg.edu.br:8080/jspui/handle/riufcg/1096.
Made available in DSpace on 2018-07-04T13:15:17Z (GMT). No. of bitstreams: 1 NIVALDO TIMÓTEO DE ARRUDA FILHO - DISSERTAÇÃO PPGEA 2011..pdf: 5184330 bytes, checksum: 4dd737343af7919e1972cd31963d1d84 (MD5) Previous issue date: 2011-02
Capes
Avalia-se neste trabalho, a produção de elementos construtivos leves a partir de matrizes cimentícias com incorporação de resíduos industriais e fibras de sisal bem como, a potencialidade da adição dessas fibras e o uso da metacaulinita e dos resíduos de produção de tijolos cerâmicos moídos, como substitutos parciais do cimento Portland. Os materiais foram caracterizados física, química e mineralogicamente, além de determinado as resistências mecânicas dos compósitos produzidos. Utilizou-se de trabalhos de reologia para encontro da pasta matriz de revestimento com adequado teor de adições pozolânicas e aditivo superplastificante. Foram avaliadas as resistências da placa de EVA, da pasta matriz de revestimento encontrada com e sem adição de fibras e do novo compósito formado pela união destes dois elementos. Utilizou-se a técnica de alinhamento de fibras com intuito de incrementar resistência ao novo compósito leve. Os ensaios de reologia do material indicaram que o tijolo moído mostrou-se mais eficiente que a metacauhmta para o mesmo teor de substituição e que, a porcentagem de 2,1% de aditivo superplastificante e a mistura M 8OC1 10TM 10MC foi considerada ideal para tornar a matriz resistente e auto-adensável; o que não se observou nos ensaios de resistência mecânica, onde a metacaulinita superou os resultados obtidos com a adição do tijolo moído. A adição da matriz com fibras alinhadas incrementou de forma significativa na resistência a tração na flexão do novo compósito leve superando em 74,78% a placa de EVA, em 35,98% a placa de EVA revestida com matriz sem fibras e em 4,23% a placa de EVA revestida com matriz adicionada de fibras distribuídas de forma randômica.
It is estimated this work. the production of lightweight construction elements from cement matrix incorporating industrial waste and sisal fíbers as well as adding the capability of these fibers and the use of metakaolin and waste production of clay bricks ground, as partial replacement of Portland cement. The materiais were characterized physically, chemically and mineralogically, and determined the mechanical strength of the composites produced. We used to work against the pulp rheology for coating the array with appropriate content of pozzolanic additions and superplasticizer. We evaluated the resistance of the plate, EVA matrix coating folder found with and without addition of new fibers and the composite formed by the union of these two elements. We used the technique of alignment of fibers with a view to increasing resistance to the new lightweight composite. Tests rheology of the material indicated that the crushed brick was more efficient than the metakaolin to the same levei of replacement and that the percentage of 2.1% of superplasticizer and mixing M 80Ci 10TM 10MC was considered ideal for making matrix resilient and self-compacting, which was not observed in tests of strength, where metakaolin surpassed the results obtained with the addition of crushed brick. The addition of the matrix with aligned fibers increased significantly in tensile strength in bending the new lightweight composite outpertòrming 74.78% of the board of EVA, while 35.98% of the plate coated with EVA matrix without fibers and 4, 23% of the plate coated with EVA matrix added fiber distnbuted randomly.
Ozdemir, Gokhan. "Mechanical Properties Of Cfrp Anchorages." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12605890/index.pdf.
Borodulina, Svetlana. "Micromechanical Behavior of Fiber Networks." Licentiate thesis, KTH, Hållfasthetslära (Avd.), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-123223.
QC 20130605
Mohr, Benjamin J. "Durability of Pulp Fiber-Cement Composites." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7222.
Wang, J., S. Dong, Ashraf F. Ashour, X. Wang, and B. Han. "Dynamic mechanical properties of cementitious composites with carbon nanotubes." Elsevier, 2019. http://hdl.handle.net/10454/17465.
This paper studied the effect of different types of multi-walled carbon nanotubes (MWCNTs) on the dynamic mechanical properties of cementitious composites. Impact compression test was conducted on various specimens to obtain the dynamic stress-strain curves and dynamic compressive strength as well as deformation of cementitious composites. The dynamic impact toughness and impact dissipation energy were, then, estimated. Furthermore, the microscopic morphology of cementitious composites was identified by using the scanning electron microscope to show the reinforcing mechanisms of MWCNTs on cementitious composites. Experimental results show that all types of MWCNTs can increase the dynamic compressive strength and ultimate strain of the composite, but the dynamic peak strain of the composite presents deviations with the MWCNT incorporation. The composite with thick-short MWCNTs has a 100.8% increase in the impact toughness, and the composite with thin-long MWCNTs presents an increased dissipation energy up to 93.8%. MWCNTs with special structure or coating treatment have higher reinforcing effect to strength of the composite against untreated MWCNTs. The modifying mechanisms of MWCNTs on cementitious composite are mainly attributed to their nucleation and bridging effects, which prevent the micro-crack generation and delay the macro-crack propagation through increasing the energy consumption.
Adhikari, Sudeep. "Mechanical Properties and Flexural Applications of Basalt Fiber Reinforced Polymer (BFRP) Bars." University of Akron / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=akron1259635900.
Sacramento, Santana Hesdras Henrique. "Improving mechanical properties and microstructure development of fiber reinforced ceramic nuclear fuel." Doctoral thesis, Universitat Politècnica de València, 2014. http://hdl.handle.net/10251/37199.
Sacramento Santana, HH. (2014). Improving mechanical properties and microstructure development of fiber reinforced ceramic nuclear fuel [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/37199
TESIS
Izquierdo, Indara Soto. "Utilização de pós residuais e fibra de sisal em blocos de concreto." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-07072015-094257/.
This research deals with the use of new alternative materials for sustainable construction. The use of residual powder materials, from organic residue and from mineral sector, and sisal fibers are good examples of unconventional materials that can be used. The main objective is to evaluate the use of residual powders and sisal fibers in the production of structural masonry blocks. Three types of mixtures for cement consumption were studied: aggregate/cement (A/C) ratios of 15, 10, and 6, in order to produce blocks structural strength classes of 4, 8 and 12 MPa, respectively. For each trace the cement were replaced by powder organic waste at levels of 5%, 10%, 15% and 20%, and natural sand replaced by stone powder at levels of 20%, 40%, 60% and 80%. A study was carried out in order to evaluate the durability of sisal fiber in the alkaline medium, with length of 20 mm and 1% volume fraction on the concrete. The physical and mechanical properties of fresh and hardened concrete were studied. The results showed that residual powder can be used as filler in concrete by replacing part of the raw material, since they caused the correct packaging in the aggregates and in the cement paste. The statistical analysis using the Bootstrap technique showed that for the stone powder the optimal percentage for replacing the sand was 60% for 15:1 and 10:1 traces and 40% for 6:1 trace. As for the organic residual powder, the results showed that the reference concrete had higher compressive strength than the concrete with low cement content (A/C ratio of 15:1). However, samples made with 5% powder and an A/C ratio of 10:1 showed greater physical and mechanical properties strength than the reference concrete. Mixtures rich in cement (A/C ratio of 6:1) and the powder replacements of up to 10% resulted in the best mechanical behavior. The sisal showed high durability in modified cementitious matrices with pozzolanic materials due to decreased calcium hydroxide (CH). It was concluded that the blocks modified with alternative materials showed quality compatible with the requirements of national construction.
Behera, Nikhil Chandra. "Topochemistry of delignification and its effect on fiber properties of spruce organosolv pulp." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/25561.
Forestry, Faculty of
Graduate
Litchfield, David W. "The Manufacture and Mechanical Properties of Poly(ethylene terephthalate) Fibers Filled with Organically-Modified Montmorillonite." Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/27175.
Ph. D.
Johnson, Richard Kwesi. "Wetlaid Cellulose Fiber-Thermoplastic Hybrid Composites - Effects of Lyocell and Steam Exploded Wood Fiber Blends." Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/43767.
Master of Science
Cho, Baik-Soon. "The in-plane shear properties of pultruded materials." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/21291.
Weisenberger, Matthew Collins. "APPLICATIONS OF MULTIWALL CARBON NANOTUBE COMPOSITES: MECHANICAL, ELECTRICAL AND THERMAL PROPERTIES." Lexington, Ky. : [University of Kentucky Libraries], 2007. http://hdl.handle.net/10225/738.
Title from document title page (viewed on March 24, 2008). Document formatted into pages; contains: ix, 97 p. : ill. (some col.). Includes abstract and vita. Includes bibliographical references (p. 91-95).
Annam, Ramyasree. "Study of Mechanical Properties of PVA Fiber-Reinforced Concrete With Raman Spectroscopic Analysis." TopSCHOLAR®, 2015. http://digitalcommons.wku.edu/theses/1460.
Rana, Akshaykumar A. "Evaluation of Electrical and Mechanical Properties of Carbon-Fiber Composites Using Interleaved Materials." Thesis, California State University, Long Beach, 2019. http://pqdtopen.proquest.com/#viewpdf?dispub=10979176.
Carbon-Fiber Reinforced Polymers (CFRPs) provides superior mechanical properties and low weight, enabling their extensive use in the aerospace industry. Susceptibility to internal damage due to out-of-plane loads and poor electrical properties are some of their major challenges that require to be addressed in order to increase the utilization of composites in further aerospace structures. Lightning strikes can lead to catastrophic damage, inflicting high repair and certification costs. Lightning Strike Protection (LSP) solutions such as integration of metallic meshes or foils into the composite structures, even though effective, impose extra costs and hinders the aircraft performance due to the increased weight of the aircraft.
This research aims at the development of a different LSP solution, by enhancing the electrical conductivity of composite, while maintaining a sufficient degree of mechanical properties. The use of non-woven conductive interlayers was proposed for manufacturing of conductive composites. Highly-conductive, low-aerial-weight carbon veil was utilized to manufacture prepreg-based CF/Epoxy laminates, which are generally toughened, in order to improve their conductivity using vacuum bag only (VBO) and heat-pressing techniques. Further, a bi-functional interlayer of graphene coated Polyamide (PA) was developed using interfacial trapping method. This conductive thermoplastic interlayer was then utilized for manufacturing Benzoxazine (BZ) infused carbon fabric laminate with Vacuum-assisted resin transfer molding (VARTM) method, which acted as a conductive toughener and improves the Inter-laminar Fracture Toughness (ILFT) as well as to increase the electrical conductivity.
The effects of the incorporation of non-woven interlayers on the electrical conductivity, thermal behavior of composites, and mechanical properties such as shear strength, compressive strength, and the ILFT (Mode-I and Mode-II) were investigated in this study. In both types of composites, an increase in electrical properties, as well as mechanical properties, were observed. The only exception was in the Mode-I ILFT of the CF/Epoxy prepregs, which decreased with the increase of the areal weight of the interleaved carbon veils. The mechanical properties increased in the range of 9%–138% with the only decrement observed in Mode-I ILFT of CF/Epoxy with carbon veils of 25%. The volume resistivity of the CF/Epoxy samples decreased significantly by approximately 50% due to the incorporation of the conductive interlayer. This added feature was used to develop a structural health monitoring (SHM) procedure. The conductive composite showed an increased sensitivity in detecting the pre-identified damage location in the composites.
永正, 邵., and Yongzheng Shao. "Study on the effects of matrix properties on the mechanical properties of carbon fiber reinforced plastic composites." Thesis, https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB12902982/?lang=0, 2015. https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB12902982/?lang=0.
博士(工学)
Doctor of Philosophy in Engineering
同志社大学
Doshisha University
Ahmed, Shabbir. "Mechanical and Surface Properties of Technical and Single Flax Fiber in Micro and Nano Scale." Thesis, North Dakota State University, 2017. https://hdl.handle.net/10365/28400.
チェン, フオン ウェン, and Nguyen Tien Phong. "Study on the effects of green micro/nano fiber addition on mechanical properties of carbon fiber reinforced epoxy composites." Thesis, https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB12614789/?lang=0, 2013. https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB12614789/?lang=0.
Kalyanam, Sriram. "Effect of silane coupling agents on the mechanical properties of glass polypropylene composites." Thesis, Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/8563.
Kang, Jin Ook. "Fiber reinforced polymeric pultruded members subjected to sustained loads." Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/20191.
Cansever, Cahit Can. "Effects Of Injection Molding Conditions On The Mechanical Properties Of Polyamide / Glass Fiber Composites." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608475/index.pdf.
Jishi, Hassan Ziad [Verfasser]. "The Fabrication and Mechanical Properties of Continuous Fiber Composite Lattice Structures / Hassan Ziad Jishi." Munich : GRIN Verlag, 2016. http://d-nb.info/1120813492/34.
Kim, Byoungil. "Effect of fiber types on the mechanical properties and permeability of high strength concrete." [Gainesville, Fla.] : University of Florida, 2006. http://purl.fcla.edu/fcla/etd/UFE0015827.
Eskander, Ashraf. "EFFECTS OF FIBER AND LITHIUM ON MECHANICAL PROPERTIES OF CONCRETE MADE FROMRECYCLED CONCRETE AGGREGATE." Master's thesis, University of Central Florida, 2006. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2954.
M.S.C.E.
Department of Civil and Environmental Engineering
Engineering and Computer Science
Civil Engineering
Tonndorf, Robert, Elke Gossla, Recep Türkay Kocaman, Martin Kirsten, Rolf-Dieter Hund, Gerald Hoffmann, Dilbar Aibibu, Michael Gelinsky, and Chokri Cherif. "Factors affecting the mechanical and geometrical properties of electrostatically flocked pure chitosan fiber scaffolds." Sage, 2018. https://tud.qucosa.de/id/qucosa%3A35536.
Tu, Zhiqiang. "Fabrication and Mechanical Properties of Carbon Fiber Reinforced Aluminum Matrix Composites by Squeeze Casting." Thesis, Université d'Ottawa / University of Ottawa, 2020. http://hdl.handle.net/10393/40523.
Ren, Luying. "Enhancement of the Mechanical Properties of Co-extruded Fiber Reinforced Tape by Uniaxial Orientation." Case Western Reserve University School of Graduate Studies / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=case1522858264943265.
Xu, Xiaolin. "Cellulose fiber reinforced nylon 6 or nylon 66 composites." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26487.
Committee Chair: John D. Muzzy; Committee Co-Chair: Youjiang Wang; Committee Member: Art Ragauskas; Committee Member: Donggang Yao; Committee Member: Karl Jacob. Part of the SMARTech Electronic Thesis and Dissertation Collection.
L, Dayakar Naik. "Effective Properties of Randomly Oriented Kenaf Short Fiber Reinforced Epoxy Composite." DigitalCommons@USU, 2015. https://digitalcommons.usu.edu/etd/4587.
Vohra, Sanjay. "A mechanics framework for modeling fiber deformation on draw rollers and freespans." Diss., Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-05172006-141347/.
Karl I. Jacob, Committee Chair ; Youjiang Wang, Committee Member ; Mary Lynn Realff, Committee Member ; Arun Gokhale, Committee Member ; Rami Haj-Ali, Committee Member.
Borodulina, Svetlana. "Micromechanics of Fiber Networks." Doctoral thesis, KTH, Hållfasthetslära (Inst.), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-188481.
QC 20160613
Weick, Brian L. "Effects of fiber type on the tribological behavior of polyamide composites." Diss., This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-10192006-115602/.
Folino, Paul (Paul John). "Characterizing ash and substrate properties in sintered metal fiber diesel particulate filters using an advanced diagnostic approach." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/100134.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 109-115).
In order to comply with strict air emissions regulations, applicable diesel engines are required to have an installed after-treatment device. A diesel particulate filter (DPF) is one of these aftertreatment devices, and it is used to capture hazardous particulate matter (PM) from the engine exhaust stream. Over the lifetime of the DPF, incombustible materials like ash are deposited within the DPF. The presence of ash inhibits the exhaust flow and thus causes flow restriction throughout the filter. This increase in the flow restriction due to ash accumulation has an adverse effect on engine performance, primarily a reduction in fuel economy. While the global effects of ash on engine performance are well researched and understood, the fundamental mechanisms of ash phenomenology in the DPF require further understanding. Current experimental data mainly addresses how ash porosity and permeability influence pressure drop across the filter, but an investigation of these properties reveals how other key sub parameters, such as ash particle size and distribution and filter oxidation level, significantly contribute to an increase in pressure drop as well. The focus of this work is to understand the behavior of ash particles in a sintered metal fiber (SMF) filter substrate and recognize the resultant effect on DPF pressure drop using an advanced diagnostic approach. Much of the work relies on the use of sophisticated imaging and software tools to quantify properties such as particle size, particle distribution, filter porosity, and permeability among others. Additionally, this research introduces and demonstrates the capabilities of these cutting-edge tools and how they can best be utilized to provide filter performance data to qualify existing and future experimental data for SMF or cordierite filters. An analysis of the data reveals a statistically significant dependence between pressure drop and the aforementioned sub-parameters.
by Paul Folino.
S.M. in Mechanical Engineering, and S.M. in Naval Architecture and Marine Engineering
Hill, Christopher Brandon. "Investigation of electrical and impact properties of carbon fiber reinforced polymer matrix composites with carbon nanotube buckypaper layers." Thesis, University of Iowa, 2012. https://ir.uiowa.edu/etd/2894.