Enhancement of mechanical, thermal and hygrothermal properties of carbon fiber/vinyl ester (CFVE) composites through nanoparticle reinforcement has been investigated. CFVE composites are becoming more and more attractive for marine applications due to two reasons : high specific strength and modulus of carbon fiber and low vulnerability of vinyl ester resin to sea water. However, the problem with this composite system is that the fiber matrix (F/M) interface is inherently weak. This leads to poor mechanical properties and fast ingress of water at the interface further deteriorating the properties. This investigation attempts to address these deficiencies by inclusion of nanoparticles in CFVE composites. Three routes of nanoparticle reinforcement have been considered : nanoparticle coating of the carbon fiber, dispersion of nanoparticles in the vinyl ester matrix, and nanoparticle modification of both the fiber and the matrix. Flexural, short beam shear and tensile testing was conducted after exposure to dry and wet environments. Differential scanning calorimetry and dynamic mechanical analysis were conducted as well. Mechanical and thermal tests show that single inclusion of nanoparticles on the fiber or in the matrix increases carbon/vinyl ester composite properties by 11-35%. However, when both fiber and matrix were modified with nanoparticles, there was a loss of properties. / by Felicia M. Powell. / Thesis (Ph.D.)--Florida Atlantic University, 2012. / Includes bibliography. / Electronic reproduction. Boca Raton, Fla., 2012. Mode of access: World Wide Web.

This study focused on the fracture and fatigue crack growth behavior in polyvinylchloride (PVC) and polyethersulfone (PES) foams. A new sandwich double cantilever beam (DCB) test specimen was implemented. Elastic foundation and finite element analysis and experimental testing confirmed that the DCB specimen is appropriate for static and cyclic crack propagation testing of soft polymer foams. A comprehensive experimental mechanical analysis was conducted on PVC foams of densities ranging from 45 to 100 kg/m3 and PES foams of densities ranging from 60 to 130 kg/m3. An in-situ scanning electron microscope study on miniature foam fracture specimens showed that crack propagation in the PVC foam was inter-cellular and in the PES foam, failure occurred predominately by extensional failure of vertical cell edges. Sandwich DCB specimens were loaded cyclically as well. For the PVC foams, the crack growth rates were substantially influenced by the density. For the PES foams, there was no clear indication about the influence of foam density on the crack growth rate. / by Elio Saenz. / Thesis (M.S.C.S.)--Florida Atlantic University, 2012. / Includes bibliography. / Electronic reproduction. Boca Raton, Fla., 2012. Mode of access: World Wide Web.

by Shaun Hurley. / Thesis (M.S.C.S.)--Florida Atlantic University, 2011. / Includes bibliography. / Electronic reproduction. Boca Raton, Fla., 2011. Mode of access: World Wide Web. / The study presents a reliability-based fatigue life prediction model for the ocean current turbine rotor blades. The numerically simulated bending moment ranges based on the measured current velocities off the Southeast coast line of Florida over a one month period are used to reflect the short-term distribution of the bending moment ranges for an idealized marine current turbine rotor blade. The 2-parameter Weibull distribution is used to fit the short-term distribution and then used to obtain the long-term distribution over the design life. The long-term distribution is then used to determine the number of cycles for any given bending moment range. The published laboratory test data in the form of an ε-N curve is used in conjunction with the long-term distribution of the bending moment ranges in the prediction of the fatigue failure of the rotor blade using Miner's rule. The first-order reliability method is used in order to determine the reliability index for a given section modulus over a given design life. The results of reliability analysis are then used to calibrate the partial safety factors for load and resistance.

In an effort to obtain an improved mode III fracture toughness test suitable for a testing standard, mechanics analysis, experimental testing, and finite element analysis (FEA) have been conducted. Of particular concern are the merits of one-point and two-point edge crack torsion (ECT) test methods, the influence of specimen geometry that overhangs beyond load/support points, and the influence of crack length on the compliance and energy release rate. Shear stress distributions at the crack front are determined to examine the uniformity of mode III loading and mode II influence. The shear stress distributions in the one-point and two-point tests are virtually identical, indicating that either of the two tests could be used interchangeably. Based on the uniformity of the mode III shear stress distribution along the crack front, it was found that the ECT specimen should have minimum overhang. Longer crack lengths tend to produce nonuniform shear stress distributions. A modified two-point ECT test fixture was developed to allow testing of specimens with a range of dimensions. This development enabled experimental verification of the results from the FEA overhang series. The specimens with a minimum overhang produced consistant mode III toughness data. The most reliable way to reduce data is through the original compliance calibration method. A modified ECT specimen was developed with a staggered crack front to produce uniform mode III crack growth. Finite element analysis of the modified ECT specimen shows a uniform mode III stress distribution along the crack front with little mode II interaction. / by Grant Browning. / Thesis (M.S.C.S.)--Florida Atlantic University, 2009. / Includes bibliography. / Electronic reproduction. Boca Raton, Fla., 2009. Mode of access: World Wide Web.

This research focuses on carbon fiber treatment by nitric acid and 3- (trimethoxysilyl)propyl methacrylate silane, and how this affects carbon/vinyl ester composites. These composites offer great benefits, but it is difficult to bond the fiber and matrix together, and without a strong interfacial bond, composites fall short of their potential. Silanes work well with glass fiber, but do not bond directly to carbon fiber because its surface is not reactive to liquid silanes. Oxidizing surface treatments are often prescribed for improved wetting and bonding to carbon, but good results are not always achieved. Furthermore, there is the unanswered question of environmental durability. This research aimed to form a better understanding of oxidizing carbon fiber treatments, determine if silanes can be bonded to oxidized surfaces, and how these treatments affect composite strength and durability before and after seawater exposure. Nitric acid treatments on carbon fibers were found to improve their tensile strength to a constant level by smoothing surface defects and chemically modifying their surfaces by increasing carbonyl and carboxylic acid concentrations. Increasing these surface group concentrations raises fiber polar energy and causes them to cohere. This impedes wetting, resulting in poor quality, high void content composites, even though there appeared to be improved adhesion between the fibers and matrix. Silane was found to bond to the oxidized carbon fiber surfaces, as evidenced by changes in both fiber and composite properties. The fibers exhibited low polarity and cohesion, while the composites displayed excellent resin wetting, low void content, and low seawater weight gain and swelling. On the contrary, the oxidized fibers that were not treated with silane exhibited high polarity and fiber cohesion. / Their composites displayed poor wetting, high void content, high seawater weight gain, and low swelling. Both fiber treatment types resulted in great improvements in dry transverse tensile strength over the untreated fibers, but the oxidized fiber composites lost strength as the acid treatment time was extended, due to poor wetting. The acid/silane treated composites lost some transverse tensile strength after seawater exposure, but the nitric acid oxidized fiber composites appeared to be more seawater durable. / by Tye A. Langston. / Thesis (Ph.D.)--Florida Atlantic University, 2008. / Includes bibliography. / Electronic reproduction. Boca Raton, Fla., 2008. Mode of access: World Wide Web.

In fabrication of nanoparticle-reinforced polymers, two critical factors need to be taken into account to control properties of the final product; nanoparticle dispersion/distribution in the matrix; and interfacial interactions between nanoparticles and their surrounding matrix. The focus of this thesis was to examine the role of these two factors through experimental methodologies and molecular-level simulations. Carbon nanotubes (CNTs) and vinyl ester (VE) resin were used as nanoparticles and matrix, respectively. In a parametric study, a series of CNT/VE nanocomposites with different CNT dispersion conditions were fabricated using the ultrasonication mixing method. Thermomechanical properties of nanocomposites and quality of CNT dispersion were evaluated. By correlation between nanocomposite behavior and CNT dispersion, a thermomechanical model was suggested; at a certain threshold level of sonication energy, CNT dispersion would be optimal and result in maximum enhancement in properties. This threshold energy level is also related to particle concentration. Sonication above this threshold level, leads to destruction of nanotubes and renders a negative effect on the properties of nanocomposites. In an attempt to examine the interface condition, a novel process was developed to modify CNT surface with polyhedral oligomeric silsesquioxane (POSS). In this process, a chemical reaction was allowed to occur between CNTs and POSS in the presence of an effective catalyst. The functionalized CNTs were characterized using TEM, SEM-EDS, AFM, TGA, FTIR and Raman spectroscopy techniques. Formation of amide bonds between POSS and nanotubes was established and verified. Surface modification of CNTs with POSS resulted in significant improvement in nanotube dispersion. In-depth SEM analysis revealed formation of a 3D network of well-dispersed CNTs with POSS connections to the polymer. In parallel, molecular dynamics simulation of CNT-POSS/VE system showed an effective load transfer from polymer chains to the CNT due to POSS linkages at the interface. The rigid and flexible network of CNTs is found to be responsible for enhancement in elastic modulus, strength, fracture toughness and glass transition temperature (Tg) of the final nanocomposites. / Includes bibliography. / Dissertation (Ph.D.)--Florida Atlantic University, 2016. / FAU Electronic Theses and Dissertations Collection

Nenhuma / Materiais mesoporosos ordenados tipo SBA-16 possuem uma rede de canais e poros de tamanho bem definido na escala nanométrica, com estrutura cúbica, elevada área superficial (400 1000 m2.g-1) e tamanho de poros usualmente em torno de 2 a 30 nm. Essa estrutura de poros torna esses materiais apropriados para incorporar e liberar uma grande variedade de moléculas na sua matriz. Dentre os diversos tipos de materiais SBA, o SBA-16 é considerado uma mesoestrutura muito interessante devido ao fato de possuir um ordenamento de mesoporos cúbico tridimensional correspondente ao grupo especial Im3m, podendo ser um material promissor para várias aplicações. Os materiais mesoporosos podem sofrer diversas modificações na sua superfície, devido à presença dos grupos silanóis, podendo produzir um material com uma funcionalidade direcionada. Neste trabalho, estudou-se a síntese e caracterização do material SBA-16 puro e após o processo de funcionalização para avaliar sua aplicação como sistema de liberação controlada de um fármaco modelo. O processo de modificação da superfície foi realizado pelo método pós-síntese, ou seja, após o obter o material SBA-16, esse passou por um segundo processo para se obter as amostras funcionalizadas. A caracterização do SBA-16 puro e funcionalizado foi feita por análise elementar (CHN), Espectroscopia na Região do Infravermelho com Transformada de Fourier (FTIR), Análise Termogravimétrica (TG), Adsorção de Nitrogênio, Microscopia Eletrônica de Varredura (MEV), Microscopia Eletrônica de Transmissão (MET), Espalhamento de Raios X a Baixos Ângulos (SAXS), e Ressonância Magnética Nuclear (RMN). Por meio da técnica de espectroscopia de absorção na região do infravermelho, foi possível observar, a partir dos espectros das amostras funcionalizadas, bandas características das vibrações da rede de sílica, bem como bandas referentes às vibrações dos grupos alquilas ancorados na estrutura da sílica. A presença do fármaco atenolol no material mesoporoso e nas amostras funcionalizadas também pode ser confirmada por meio das medidas de FTIR. A estabilidade térmica e as degradações que ocorrem nos componentes puros, bem como nas amostras modificadas na superfície, foram investigadas e estabelecidas pela análise termogravimétrica. Por meio da TG foi possível quantificar a presença dos grupos orgânicos ancorados nesse material. A presença dos grupos orgânicos conduziu a alterações na estrutura do material final, com a diminuição da área superficial e volume de poros. Porém, a distribuição de poros se mostrou semelhante em todas as amostras. Os resultados de MEV, MET e SAXS do SBA-16 e das amostras funcionalizadas revelaram uma estrutura bem ordenada de mesoporos, característica intrínseca desses materiais. Por meio das medidas de ressonância magnética nuclear de 29Si e 13C de estado sólido (RMN-MAS) nas amostras funcionalizadas, foi possível caracterizar e avaliar a forma de ligação desses grupos orgânicos na matriz de sílica. Através do ensaio de liberação, foi possível avaliar a quantidade de atenolol incorporado e verificar o comportamento da liberação desse nas amostras sintetizadas. Com os resultados de citotoxicidade foi possível determinar a viabilidade celular, obtendo-se resultados satisfatórios para uma futura aplicação clínica desse material. / Type ordered mesoporous materials SBA-16 have a network of channels and well defined pore size in nanometer scale. Cubic structure has a high surface area (400 - 1000m2.g-1) and pore size is usually around 20 to 30 nm. This porous structure makes these materials appropriate to incorporate and release a large variety of molecules in the matrix. Among these SBA-type silica materials, SBA-16 is considered a very interesting mesostructure due to the its 3D cubic arrangement of mesopores corresponding to the Im3m space group, a promising material for a large range of applications. The mesoporous materials may undergo several changes in its surface due to the presence of silanol groups, which can produce a material with a targeted feature. The materials were characterized by elemental analysis (CHN), Fourier Transform Infrared Spectroscopy (FTIR), Nitrogen Adsorption, Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Small Angle X Ray Scattering (SAXS), Nuclear Magnetic Resonance (RMN), and Thermal Analysis. Through the FTIR analysis technique, it was possible to observe characteristic bands of the silica vibrations, as well as vibrations bands due the presence of alkyl groups anchored into the silica structure. The presence of the atenolol in the mesoporous material and functionalised samples was also confirmed by FTIR. The thermal stability and the degradation of the surface modified samples were determined by thermogravimetry. The incorporation of the organic groups into the mesoporous silica led to a significant change in the structural properties of the system, with the decrease of the specific surface area and pore volume, but the pore size distribuition was similar in all samples. The results obtained by SEM, TEM and SAXS for the samples reveal a well-defined cubic arrangement of uniform mesoporous structure, intrinsic characteristic of these materials. By measuring nuclear magnetic resonance of 29Si and 13C solid state (MAS-NMR) in the functionalized samples, it was possible to characterize and measure the extent of binding of organic groups in the silica matrix. Through the release assay was possible to evaluate the amount of embedded atenolol and verify the behavior of the drug release from the synthesized samples. Considering the results of cytotoxicity, it was possible to determine cell viability by obtaining satisfactory results for future clinical application of this material.

Nenhuma / A presença do carbono em materiais refratários modifica a tensão superficial entre o sólido (refratário) e o líquido (metal-escória) diminuindo a penetração do líquido e, consequentemente, reduzindo o processo de corrosão das cerâmicas refratárias durante os processos siderúrgicos. Além deste efeito protetor, o carbono desempenha ainda papel importante quanto à resistência mecânica e ao choque térmico dos tijolos refratários. Nos anos recentes, têm sido desenvolvidos nanocompósitos refratários, incorporando-se na matriz cerâmica uma segunda fase de carbono com dimensões em escala nanométrica. Esta estratégia visa ao desenvolvimento de materiais com desempenhos aprimorados em relação aos materiais hoje utilizados, lançando mão das propriedades mecânicas, térmicas, elétricas e físico-químicas únicas dos nanomateriais de carbono. Duas barreiras tecnológicas, entretanto, devem ser contornadas para o efetivo uso de nanocompostos de carbono em refratários: i) o controle eficiente de sua dispersão na matriz cerâmica e resina polimérica; ii) a melhoria/otimização de sua resistência à oxidação em temperaturas elevadas. Este trabalho teve como objetivos a avaliação dos aspectos termodinâmicos e cinéticos do processo de oxidação de materiais de carbono nanoestruturados (nanotubos de múltiplas paredes, nanofibras e negro de fumo) em compósitos refratários de alumina contendo ligante polimérico. Vale ressaltar que o carbono amorfo proveniente da transformação da resina polimérica é simultaneamente analisado. A análise cinética foi realizada empregando-se a termogravimetria semi-isotérmica e isotérmica, nas quais a amostra é submetida a diferentes patamares de temperatura e aquecida até atingir massa constante. Os dados das diferentes composições foram tratados de forma a obter e ajustar modelos matemáticos que representam o processo de oxidação. Foi também investigado o efeito do acréscimo de elementos com elevada afinidade termodinâmica pelo oxigênio, especificamente boro, titânio e silício, com o objetivo de reduzir ou eliminar a oxidação dos carbonos nanoestruturados incorporados. Utilizando planejamento fatorial de experimentos foi possível avaliar, acompanhar e modelar o comportamento da oxidação dos diferentes compósitos e observar os efeitos de proteção de elementos antioxidantes selecionados sobre a perda de massa dos diferentes nanocarbonos. O modelo cinético básico obtido indica que o processo de oxidação segue o modelo de difusão por poros. As análises obtidas por microscopia eletrônica de varredura (MEV) demonstraram que, para algumas formulações contendo formas nanoestruturadas de carbono e aditivos antioxidantes, houve efeito protetor do carbono, em maior ou menor grau, como evidenciado pelas análises de espectroscopia de energia dispersiva (EDS) efetuadas sob os materiais pós queima. Em determinadas situações foi possível detectar até mesmo formas aparentemente íntegras de carbono nanoestruturado pouco ou nada afetadas pelo processo de oxidação pelo qual o material foi submetido. Estas técnicas permitiram também observar por microscopia eletrônica de varredura, a aparente presença de depósito formado sobre os nanotubos de carbono, sugerindo a presença de composto não determinado, possivelmente um carbeto, o que teria efeito protetor diante do processo oxidativo. / The presence of carbon in refractory materials increases the surface tension between the solid (refractory) and the liquid (metal-slug), decreases the liquid penetration and, consequently, reduces the corrosion of refractory ceramics used in steel-making processes. Besides this protecting effect, carbon also plays an important role in the mechanical strength and thermal shock of refractory bricks. In recent year, refractory nanocomposites have been developed by incorporating a second carbon phase of nanometric dimensions into the ceramic matrix. This strategy aims at the development of materials with improved performance in relation to the currently used materials by taking advantage of the singular mechanical, thermal, electrical, and physical and chemical properties of carbon nanomateriais. Nevertheness, two technological barriers must be overcome for the effective use of carbon nanocomposites in refractory materials: i) the efficient control of dispersion in the ceramic matrix and the polymer resin, ii) improvement of the resistance to oxidation at high temperatures. This study sought to evaluate the thermodynamic and kinectic aspects of the oxidation of nanostructured carbon materials (multi-walled nanotubes (MWNT), nonofibers, and carbon black) in alumina refractory composite using a polymeric ligand. It is worth pointing out that amorphous carbon obtained by the transformation of the polymer resin was analyzed simultaneously. The kinetic analysis was conducted using semi-thermal thermogravimetry. The sample was submitted to different temperature gradients and heated until the mass was constant. Different compositions were tested in order to obtain and adjust mathematical models that represented the oxidation process. The effect of the addition of elements with high thermodynamic affinity for oxygen, specifically boron, titanium, and silica, was investigated seeking to reduce or prevent the oxidation of the incorporated nanostructured carbons. The use of experimental factorial planning allowed the evaluation, follow-up, and modeling of the oxidation behavior of the planned formulations and the observation of the effects of the protection of the antioxidation elements selected on the mass loss of the different nanocarbons. The kinetic model obtained indicates that the oxidation process follows the pore diffusion model.

O câncer é uma das principais causas de morte em todo o mundo, sendo as neoplasias malignas de pulmão, estômago, fígado, cólon e mama em maior número. E, recentemente, observa-se na literatura um grande número de trabalhos onde novos materiais, especialmente nanoparticulados, vêm sendo estudados como carreadores de drogas e radioisótopos aplicados ao tratamento do câncer. Como materiais mesoporosos à base de sílica, graças a sua enorme área superficial e biocompatibilidade, têm sido estudados intensivamente propiciando amplas aplicações em várias áreas, o emprego da sílica SBA-16 nanoestruturada podem vir a ser um específico carreador de radioisótopos acumulando-os nas células malignas. Com isso a proposta deste estudo é desenvolver estudos in vitro utilizando SBA-16 capaz de concentrar seletivamente nas células malignas quantidades terapêuticas do radioisótopo Gadolínio-159 conduzindo-as a morte. Neste trabalho foi realizada a síntese da sílica mesoporosa ordenada, SBA-16 e a incorporação do complexo Gd-DTPA-BMA, assim como a caracterização química e estrutural. As técnicas utilizadas para analisar a ocorrência da incorporação do complexo de gadolínio na matriz de sílica foram análise elementar, espectroscopia de emissão atômica (ICP-AES), análise elementar (CHN), espectroscopia na região do infravermelho (FTIR), adsorção de nitrogênio (BET), difração de raios-x a baixos ângulos (SAXS) e análise termogravimétrica (TG). Para análise da morfologia da sílica pura utilizou-se a microscopia eletrônica de varredura (MEV) e microscopia eletrônica de transmissão (MET). Por espectroscopia de correlação de fótons (PCS) foi possível obter a medida do tamanho médio das partículas, o índice de polidispersividade (PDI) da sílica SBA-16 e o potencial zeta por anemometria de laser Doppler (LDA). Os resultados de incorporação analisados por ICP-AES indicaram que o material SBA-16 obteve um alto índice de incorporação do gadolínio (93 %). A cinética de liberação, em fluído simulado corpóreo, apresentou estabilidade considerável e baixo teor de liberação (1 %). A sílica mesoporosa SBA-16 apresentou viabilidade celular em contato direto com cultura de células. As amostras, com gadolínio incorporado na matriz de sílica, após da irradiação não apresentaram atividade citotóxica expressiva, o que implica que esses estudos devem aprimorados para que mais pesquisas na área de nanobiotecnologia sejam realizadas. / Cancer is a leading cause of death worldwide, and malignant neoplasms of the lung, stomach, liver, colon and breast in greater numbers. And recently observed in the literature a large number of reviews where new materials, especially nanoparticle, has been studied as drug carriers and radioisotopes applied to cancer treatment. How mesoporous materials based on silica, thanks to its huge surface area and biocompatibility, have been studied intensively providing broad applications in various areas, the use of nanostructured silica SBA-16 might be a carrier specific radioisotope accumulate in the cells malignant. Thus the aim of this study is to develop in vitro studies using SBA-16 can selectively concentrate in malignant cells therapeutic amounts of the radioisotope Gadolinium-159 escorting them to death. This work was performed orderly synthesis of mesoporous silica, SBA-16 and incorporating the complex Gd-DTPA-BMA, as well as chemical and structural characterization. The techniques used to analyze the occurrence of the incorporation of the gadolinium complex in the silica matrix were elemental analysis (CHN), atomic emission spectroscopy (ICP-AES), infrared spectroscopy (FTIR), nitrogen adsorption (BET), small-angle X-ray scattering (SAXS) and thermogravimetric analysis (TG). To analyze the morphology of pure silica used the scanning electron microscopy (SEM) and transmission electron microscopy (TEM). By photon correlation spectroscopy (PCS) it was possible to obtain a measure of mean particle size, the polydispersity index (PDI) of the silica SBA-16, and the zeta potential by laser Doppler anemometry (LDA). The results of incorporation analyzed by ICP-AES indicated that the material SBA-16 had a higher rate of incorporation of gadolinium (93%). The release kinetics in simulated body fluid, showed considerable stability and low release (1%). The mesoporous silica SBA-16 showed cell viability in direct contact with cell culture. Samples with gadolinium incorporated in the silica matrix after irradiation showed no significant cytotoxic activity, implying that these studies should improved so that more research in nanobiotechnology are performed.

Submitted by Cátia Araújo (catia.araujo@unipampa.edu.br) on 2017-01-26T14:42:35Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Modelo computacional do aumento da tenacidade do concreto de reforço por fibras utilizando ANSYS.pdf: 6320923 bytes, checksum: 34e8ae31406d5b12e787bd91316b32b5 (MD5) / Approved for entry into archive by Cátia Araújo (catia.araujo@unipampa.edu.br) on 2017-01-26T14:43:33Z (GMT) No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Modelo computacional do aumento da tenacidade do concreto de reforço por fibras utilizando ANSYS.pdf: 6320923 bytes, checksum: 34e8ae31406d5b12e787bd91316b32b5 (MD5) / Made available in DSpace on 2017-01-26T14:43:33Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Modelo computacional do aumento da tenacidade do concreto de reforço por fibras utilizando ANSYS.pdf: 6320923 bytes, checksum: 34e8ae31406d5b12e787bd91316b32b5 (MD5) Previous issue date: 2016-05-09 / Neste trabalho, apresenta-se um modelo computacional abrangente para analise do compósito cimenticeo reforçado por fibras, utilizando o software ANSYS que tem como base o método de elementos finitos. As simulações tem como foco, simular uma única fibra inserida na matriz de concreto, analisando a contribuição individual de cada fibra para a resistência final do compósito. Através de um procedimento unido ANSYS e MATLAB e possível unir o modelo em elementos finitos e a modelagem matemática. Utilizando o modelo de zonas coesivas (CZM) e a relação ԏ (s), o atrito da interface e simulado e as propriedades interfaciais analisadas. Os resultados da forca de ponte versus abertura de trinca são comparados com ensaios experimentais obtidos na literatura para diferentes tipos de fibras enterradas em matriz cimenticea com diferentes ângulos de inclinação em relação a superfície fraturada. Utilizando a superfície de falha para o concreto de William-Warnke, o spalling na matriz e quantificado. Para entender como o spalling se forma e se propaga a influencia ainda pouco estudada da distribuição de pressão na interface e analisada. Os resultados mostram que existem parâmetros ótimos que aumentam significativamente a tenacidade. Tanto o spalling como a distribuição de pressão na interface comprovam o porque das características mecânicas de fibra, matriz e interface e claro da geometria da fibra, favorecem ou não a melhora na resistência mecânica do compósito. / This work present a computational model for analysis of fiber reinforced cementitious composite using ANSYS which is based on the finite element method. The modeling is focus on simulating a single fiber pullout inserted into the concrete matrix and analyzing the individual contribution of each fiber to the ultimate strength and toughening of the composite. Through a computational procedure united ANSYS and MATLAB it is possible to connect the finite elements model to mathematical model. By use of the cohesive zones model (CZM) and ԏ (s) relationship, the friction on the interface is simulated and the interfacial performance as well as the pressure distribution at the interface are analyzed. The results of bridging force versus crack opening are compared with experimental tests obtained in the literature for different types of fibers embedded into cement matrix with different angles of inclination relative to the fractured surface. Using the William-Warnke failure surface for the concrete, the spalling in the matrix is quantified. To understand how the spalling is formed and propagated the pressure distribution on the interface that still little studied is analyzed. The results show that there are optimun parameters that could significantly improve the strength and toughness of composites. Both spalling and the pressure distribution on the interface show why the mechanical properties of fiber, matrix and interface and geometry of the fiber, favor or not the improvement in mechanical strength and toughness of the composite.