Relevant bibliographies by topics / Fiber element method

Academic literature on the topic 'Fiber element method'

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Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Fiber element method"

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Velloso, Raquel Q., Michéle D. T. Casagrande, Eurípedes A. V. Junior, and Nilo C. Consoli. "Simulation of the Mechanical Behavior of Fiber Reinforced Sand using the Discrete Element Method." Soils and Rocks 35, no. 2 (May 1, 2012): 201–6. http://dx.doi.org/10.28927/sr.352201.

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The general characteristics of granular soils reinforced with fibres have been reported in previous studies and have shown that fibre inclusion provides an increase in material strength and ductility and that the composite behaviour is governed by fibre content, as well as the mechanical and geometrical properties of the fibre. The present work presents a numerical procedure to incorporate fiber elements into an existing discrete element code (GeoDEM). The fiber elements are represented by linear elastic-plastic segments that connect two neighbor contacts where the fiber is located. These elements are characterized by an axial stiffness, tensile strength and length. The effect of the addition of fibers was evaluated numerically by comparing the stress-strain behavior of a pure sand with and without fibers. These simulations showed that the addition of fibers provides a significant increase in strength for the mixture in comparison with strength of the pure sand.
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Xiong, Xiaoshuang, Shirley Z. Shen, Lin Hua, Jefferson Z. Liu, Xiang Li, Xiaojin Wan, and Menghe Miao. "Finite element models of natural fibers and their composites: A review." Journal of Reinforced Plastics and Composites 37, no. 9 (February 6, 2018): 617–35. http://dx.doi.org/10.1177/0731684418755552.

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Finite element method has been widely applied in modeling natural fibers and natural fiber reinforced composites. This paper is a comprehensive review of finite element models of natural fibers and natural fiber reinforced composites, focusing on the micromechanical properties (strength, deformation, failure, and damage), thermal properties (thermal conductivity), and macro shape deformation (stress–strain and fracture). Representative volume element model is the most popular homogenization-based multi-scale constitutive method used in the finite element method to investigate the effect of microstructures on the mechanical and thermal properties of natural fibers and natural fiber reinforced composites. The representative volume element models of natural fibers and natural fiber reinforced composites at various length scales are discussed, including two types of geometrical modeling methods, the computer-based modeling method and the image-based modeling method. Their modeling efficiency and accuracy are also discussed.
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Gao, Jian Hong, and Xiao Xiang Yang. "Evaluation of 3D Embedded Element Technique in the Finite Element Analysis for the Composite." Key Engineering Materials 801 (May 2019): 65–70. http://dx.doi.org/10.4028/www.scientific.net/kem.801.65.

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RVE combined with finite element analysis (FEA) is a very popular method to predict the mechanical property of the composite reinforced by short fibers. In the conventional method, generally the “tie” approach is used. By this method, the FE model with high fiber aspect ratio can not be achieved and the non-convergence of the numerical calculation may appear because of the complex mesh. The embedded element techinique is considered to be a replaceable method . Using this method, the mechanical behavior of composite with high fiber aspect ratio would be simulated. Therefore, in this study, the 3D solid element was employed for the FE model with multi cylinder particles. The comparisions of the Mise stress and the displacement between the embedded and conventional method indicate that compared with the stress transfer, the simulated result of composite stiffness is more accurate. In addition, the effects of model size, fiber orientated angle, fiber volume fraction and fiber aspect ratio were investigated. The numerical results were compared with the Mori-Tanaka model and the good agreements verify the applicability of the embedded element technique we studied in this paper.
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Du, Zhao Qun, Ya Fen Luo, Yun Xu, Gang Zheng, and Wei Dong Yu. "Qualitative Characterization and Identification of Polylactic Fiber based on GC-MS, IR and Element Analysis." Advanced Materials Research 236-238 (May 2011): 1085–88. http://dx.doi.org/10.4028/www.scientific.net/amr.236-238.1085.

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Polylactic fiber is a new renewable and biodegradable polymer material for its better physical property and thermoplastic and biological properties, while there are no corresponding inspection method to characterize and identify polylactic fiber with other fibers. So, the present paper is to qualitative analyze the features of PLA fiber and identify it with general fibers, including Polyester, Polyamide, Polyacrylic, Diacetate, Cotton, Viscose and Silk fibers. Elementary analysis method is utilized to have the definite analysis of fiber purity degree and category by the corresoponding element contents of constructing elements. The experimental results show that there exist good accordance with the theoretical results, and is suitable for qualitative characterizaion and identification of fibers. Gas chromatography mass spectrum method is used to feature marker functional groups of these eight fibers, and to further have a qualitative analysis of each fiber. IR spectroscopy proves the qualitative identification on fiber category by the marker absorbing peaks of functional groups ranging from 650cm-1-2200cm-1. These results will be greatly helpful in the qualitative analysis and indectification of Polylactic fiber.
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Kimyong, Cha Yun, Sontipee Aimmanee, Vitoon Uthaisangsuk, and Wishsanuruk Wechsatol. "Micromechanics Damage Analysis in Fiber-Reinforced Composite Material Using Finite Element Method." Key Engineering Materials 525-526 (November 2012): 541–44. http://dx.doi.org/10.4028/www.scientific.net/kem.525-526.541.

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Fiber-reinforced composite materials (FRC) are used in a wide range of applications, since FRC exhibits higher strength-to-density ratio in comparison to traditional materials due to long fibers embedded in a matrix material. Failures occurred in FRC components are complicated because of the interaction of the constituents. The aim of this study is to investigate damage behavior in a unidirectional glass fiber-reinforced epoxy on both macro-and micro-levels by using finite element method. The Hashins criterion was applied to define the onset of macroscopic damage. The progression of the macroscopic damage was described using the Matzenmiller-Lubliner-Taylor model that was based on fracture energy dissipation of material. To examine the microscopic failure FE representative volume elements consisting of the glass fibers surrounded by epoxy matrix with defined volume fraction was considered. Elastic-brittle isotropic behaviour and the Coulomb-Mohr criterion were applied for both fiber and epoxy. The results of the macroscopic and microscopic analyses were correlated. As a result, damage initiation and damage development for the investigated FRC could be predicted.
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Breuer, Kevin, Axel Spickenheuer, and Markus Stommel. "Statistical Analysis of Mechanical Stressing in Short Fiber Reinforced Composites by Means of Statistical and Representative Volume Elements." Fibers 9, no. 5 (May 6, 2021): 32. http://dx.doi.org/10.3390/fib9050032.

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Analyzing representative volume elements with the finite element method is one method to calculate the local stress at the microscale of short fiber reinforced plastics. It can be shown with Monte-Carlo simulations that the stress distribution depends on the local arrangement of the fibers and is therefore unique for each fiber constellation. In this contribution the stress distribution and the effective composite properties are examined as a function of the considered volume of the representative volume elements. Moreover, the influence of locally varying fiber volume fraction is examined, using statistical volume elements. The results show that the average stress probability distribution is independent of the number of fibers and independent of local fluctuation of the fiber volume fraction. Furthermore, it is derived from the stress distributions that the statistical deviation of the effective composite properties should not be neglected in the case of injection molded components. A finite element analysis indicates that the macroscopic stresses and strains on component level are significantly influenced by local, statistical fluctuation of the composite properties.
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Kaushik, Nitish, Ch Sandeep, P. Jayaraman, J. Justin Maria Hillary, V. P. Srinivasan, and M. Abisha Meji. "Finite Element Method-Based Spherical Indentation Analysis of Jute/Sisal/Banana-Polypropylene Fiber-Reinforced Composites." Adsorption Science & Technology 2022 (September 20, 2022): 1–19. http://dx.doi.org/10.1155/2022/1668924.

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Material hardness of natural fiber composites depends upon the orientation of fibers, ratio of fiber to matrix, and their mechanical and physical properties. Experimentally finding the material hardness of composites is an involved task. The present work attempts to explore the deformation mechanism of natural fiber composites subjected to post-yield indentation by a spherical indenter through a two-dimensional finite element analysis. In the present work, jute-polypropylene, sisal-polypropylene, and banana-polypropylene composites are considered. The analysis is attempted by varying the properties of Young’s modulus of fiber and matrix, diameter of fiber, and horizontal and vertical center distance between the fibers. The analyses results showed that as the distance between the fiber’s center increases, the bearing load capacity of all composite increases nonlinearly. The jute fiber composite shows predominate load-carrying capacity compared to other composites at all L / D ratios and interference ratios. The influence of subsurface stress in lateral direction is minimal and gets reduced as the distance between the fiber centers increases. The variation in diameter of fiber influences significantly, i.e., beyond the L / D ratio of 1.0; for the same contact load ratio, the bearing area support is double for jute-polypropylene composite compared to sisal-polypropylene composite. Compared to the sisal-polypropylene composite, for the same interference ratio, the load-carrying capacity is two times high for banana-polypropylene composite, whereas four times high for jute-polypropylene composite, but this effect decreases as the L / D ratio decreases. In all the composites, the subsurface stress gets distributed as the L / D ratio increases. The ratio of fibers center distance to diameter of fiber influences marginally on the contact load and contact area and significantly on the contact stress for all the fiber-reinforced composites.
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Kvam, David J., Yi Yu Duan, Erica Donnelly, and Alicia Restrepo. "Finite Element Method and Analytical Studies on Fiber-Metal Laminates under Multiaxial Loadings." Advanced Engineering Forum 23 (July 2017): 63–71. http://dx.doi.org/10.4028/www.scientific.net/aef.23.63.

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Fiber-metal laminates (FMLs) are composites materials that are commonly used in areas such as aircraft industry. They are composed of ductile metal layers with high strength fiber reinforced polymer layers. So far, however, only uniaxial tests have been used to characterize the quasistatic mechanical properties, which cannot reflect the real loading situation of the FML applications. In this work biaxial tensile behavior of FMLs with glass and Kevlar fibers based on aluminum alloy is studied with finite element method simulation. The simulation is run to find the stress-strain relationship for FMLs at the off-axis angles of 0˚ and 45˚ for glass and Kevlar fibers. The “composites layups” are constructed for the 3D FML part. Two different elements C3D8R (8-node linear) and C3D20R (20-node quadratic) are used to carry out the simulation. The results show that C3D20R shows major advantages. Analytical solutions based on the classical laminate theory are obtained to compare with the finite element method (FEM) solutions. The results show good consistency.
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Kisała, Piotr, Waldemar Wójcik, Nurzhigit Smailov, Aliya Kalizhanova, and Damian Harasim. "Elongation determination using finite element and boundary element method." International Journal of Electronics and Telecommunications 61, no. 4 (December 1, 2015): 389–94. http://dx.doi.org/10.2478/eletel-2015-0051.

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AbstractThis paper presents an application of the finite element method and boundary element method to determine the distribution of the elongation. Computer simulations were performed using the computation of numerical algorithms according to a mathematical structure of the model and taking into account the values of all other elements of the fiber Bragg grating (FBG) sensor. Experimental studies were confirmed by elongation measurement system using one uniform FBG.
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Hejazi, Seyed Mahdi, Seyed Mahdi Abtahi, Mohammad Sheikhzadeh, and Amir Mostashfi. "Micromechanical analysis of loop-formed fiber-reinforced soil composite." Journal of Industrial Textiles 44, no. 3 (July 8, 2013): 418–33. http://dx.doi.org/10.1177/1528083713495251.

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In this research, loop-formed fiber is introduced as a novel reinforcement method of soil composites instead of using ordinary fibers. In order to investigate the materials' mechanical properties, the shear behavior of both fiber and looped-fiber-reinforced soil composites was analyzed by micromechanical method (finite element method) and a set of direct shear tests. The results indicate that the looped-fiber soil composite exhibits greater failure strain energy compared with fiber-reinforced soil composite at the same fiber orientation in the substrate. Furthermore, the proposed model demonstrated two major reinforcing components: “the fiber effect” and “the loop effect.” The latter effect is the key benefit and the main advantage of using looped fibers over ordinary fibers in soil reinforcement. Altogether, there is a close agreement between finite element method outputs and experimental results, suggestive of a novel technical textile material that could potentially be used in geotechnical engineering.
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Dissertations / Theses on the topic "Fiber element method"

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Rezak, Sheila. "Analysis of flexible fiber suspensions using the Lattice Boltzmann method." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24798.

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Thesis (Ph.D.)--Mechanical Engineering, Georgia Institute of Technology, 2009.
Committee Co-Chair: Aidun, K. Cyrus; Committee Co-Chair: Ghiaasiaan, Mostafa; Committee Member: Deng, Yulin; Committee Member: Empie, Jeff; Committee Member: Patterson, Tim.
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Caselman, Elijah. "Elastic property prediction of short fiber composites using a uniform mesh finite element method." Diss., Columbia, Mo. : University of Missouri-Columbia, 2007. http://hdl.handle.net/10355/5036.

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Thesis (M.S.)--University of Missouri-Columbia, 2007.
The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on March 19, 2008) Includes bibliographical references.
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FERREIRA, CRISTIANE ARANTES. "STUDY OF MECHANICAL BEHAVIOR OF FIBER REINFORCED SOIL THROUGH DISCRETE ELEMENT METHOD." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2010. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=33093@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO
COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
PROGRAMA DE EXCELENCIA ACADEMICA
Um grande número de novos materiais geotécnicos foi desenvolvido baseado na adição de materiais fibrosos, sendo incorporados como elementos de reforço. A técnica de solo reforçado pode ser representada pela produção e aplicação, não somente de fibra natural, mas também de fibras sintéticas e poliméricas. Estudos anteriores de solos reforçados com fibras de polipropileno têm mostrado melhora significativa das propriedades mecânicas dos solos, tais como o aumento da resistência de pico e resistência pós-pico, ductilidade e tenacidade. Estes resultados mostram um grande potencial deste tipo de fibra, quando utilizado como reforço de solos, por exemplo, em base de fundações superficiais, aterros sobre solos moles e liners de cobertura de aterros sanitários. A partir de ajustes matemáticos para determinar a interação entre solos granulares e observações do comportamento global em macro-escala tornou possível analisar o comportamento de solos granulares reforçados com fibras de uma forma micro-mecânica. A modelagem numérica do comportamento mecânico de solos reforçados com fibras de polipropileno, através de uma análise micro-mecânica, utiliza como ferramenta o Método dos Elementos Discretos (MED), que permite a representação do solo em 2D, a partir de um conjunto de partículas de elementos discretos circulares. O MED descarta a visão clássica do solo como uma forma contínua, proporcionando a possibilidade de modelá-lo como partículas constituintes. Sua formulação baseia-se no equilíbrio de forças e de deslocamentos gerados pelos contatos, os quais são descritos através das leis da física clássica, permitindo o mapeamento dos movimentos de cada partícula. A vantagem da micro-mecânica é a possibilidade de explicitar microestruturas, tais como fibras de polipropileno, responsáveis pela mudança no comportamento do solo. Com base no estudo deste fenômeno, causado pela inserção de fibras de polipropileno em materiais granulares, formulações matemáticas foram propostas com a finalidade de descrever o comportamento de solos reforçados através da implementação do código de elementos discretos (DEMlib). Após a calibração e validação do programa, a influência decorrente da inserção do reforço de fibra ao solo foi analisada, sendo realizadas simulações de ensaios biaxiais em amostras discretas de areia, com e sem o reforço fibroso. O comportamento micro-mecânico de misturas reforçadas permitiu avaliar os efeitos das mudanças no teor de fibras presente na matriz de solo, bem como diferentes rigidezes das fibras. Conclui-se que o estudo realizado pelo Método dos Elementos Discretos identificou a real interação entre as partículas do solo e do reforço em forma de fibra, indicando que as fibras, quando inseridas no solo, podem sofrer deformações plásticas de tração e alongamento até atingir a ruptura, proporcionando a melhora nos parâmetros mecânicos do solo.
A large number of new geotechnical materials was developed based on the addition of fibrous materials being incorporated as reinforcement. The technique of reinforced soil can be represented by the production and application, not only natural fiber, but also synthetic fibers and polymer. Previous studies of soil reinforced with polypropylene fibers have shown significant improvement of mechanical properties of soils, such as increasing the resistance peak and postpeak strength, ductility and toughness. These results show a great potential for this type of fiber, when used as soil reinforcement, for example, based on shallow foundations, embankments over soft soils and liners for landfill cover. From mathematical adjustments to determine the interaction between granular soils and the observation of global macro-scale become possible to analyze the behavior of granular soils reinforced with fibers in a micro-mechanics. The numerical modeling of mechanical behavior of soil reinforced with polypropylene fibers, through a micro-mechanical analysis, the tool uses as the Discrete Element Method (DEM), which allows the representation of the soil in 2D, from a set of particles circular discrete elements. The MED rule out the classical view of soil as a continuous form, providing the ability to model it as a constituent particle. Its formulation is based on the balance of forces and displacements generated by the contacts, which are explained through the laws of classical physics, allowing the mapping of movements of each particle. The advantage of micro- mechanics is the possibility of explicit microstructures, such as polypropylene fibers, responsible for the change in the behavior of the soil. Based on the study of this phenomenon, caused by the insertion of polypropylene fibers in granular materials, mathematical formulations have been proposed in order to describe the behavior of reinforced soils through the implementation of the Code of discrete elements (DEMlib). After calibration and validation program, the influence due to the insertion of fiber reinforcement to the soil was analyzed, and simulations of biaxial tests on discrete samples of sand, with and without the fibrous reinforcement. The micro-mechanical behavior of blends reinforced allowed evaluating the effects of changes in fiber content present in the soil matrix and different rigidities of the fibers. We conclude that the study by the Discrete Element Method identified the actual interaction between the soil particles and the reinforcement in the form of fiber, indicating that the fibers, when inserted into the soil, may undergo plastic deformation and tensile elongation until the rupture, providing an improvement in mechanical parameters of soil.
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Boyapati, Siva Kumar. "Finite element analysis of low-profile FRP bridge deck (Prodec 4)." Morgantown, W. Va. : [West Virginia University Libraries], 2006. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4945.

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Thesis (M.S.)--West Virginia University, 2006.
Title from document title page. Document formatted into pages; contains xv, 147 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 145-147).
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Suraj, Suraj. "Finite-element modeling of a composite bridge deck." Morgantown, W. Va. : [West Virginia University Libraries], 2005. https://etd.wvu.edu/etd/controller.jsp?moduleName=documentdata&jsp%5FetdId=4008.

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Thesis (M.S.)--West Virginia University, 2005.
Title from document title page. Document formatted into pages; contains x, 91 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 85-86).
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Middleton, Joseph Ervin. "Elastic property prediction of long fiber composites using a uniform mesh finite element method." Diss., Columbia, Mo. : University of Missouri-Columbia, 2008. http://hdl.handle.net/10355/5684.

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Thesis (M.S.)--University of Missouri-Columbia, 2008.
The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on August 13, 2009) Includes bibliographical references.
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Shao, Susan X. "Application of finite element analysis (FEA) to fiber-reinforced composite of recycled high density polyethelene /." View online, 1993. http://repository.eiu.edu/theses/docs/32211998853201.pdf.

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Sugden, Frank Daniel. "A NOVEL DUAL MODELING METHOD FOR CHARACTERIZING HUMAN NERVE FIBER ACTIVATION." DigitalCommons@CalPoly, 2014. https://digitalcommons.calpoly.edu/theses/1318.

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Presented in this work is the investigation and successful illustration of a coupled model of the human nerve fiber. SPICE netlist code was utilized to describe the electrical properties of the human nervous membrane in tandem with COMSOL Multiphysics, a finite element analysis software tool. The initial research concentrated on the utilization of the Hodgkin-Huxley electrical circuit representation of the nerve fiber membrane. Further development of the project identified the need for a linear circuit model that more closely resembled the McNeal linearization model augmented by the work of Szlavik which better facilitated the coupling of both SPICE and COMSOL programs. Related literature was investigated and applied to validate the model. This combination of analysis tools allowed for the presentation of a consistent model and revealed that a coupled model produced not only a qualitatively comparable, but also a quantitatively comparable result to studies presented in the literature. All potential profiles produced during the simulation were compared against the literature in order to meet the purpose of presenting an advanced computational model of human neural recruitment and excitation. It was demonstrated through this process that the correct usage of neuron models within a two dimensional conductive space did allow for the approximate modeling of human neural electrical characteristics.
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Broyles, Norman S. "Thermoplastic Sizings: Effects on Processing, Mechanical Performance, and Interphase Formation in Pultruded Carbon Fiber/Vinyl-Ester Composites." Diss., Virginia Tech, 1999. http://hdl.handle.net/10919/30283.

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Sizings, a thin polymer coating applied to the surface of the carbon fiber before impregnation with the matrix, have been shown to affect the mechanical performance of the composite. These sizings affect the processability of the carbon fiber that translates into a composite with less fiber breakage and improved fiber/matrix adhesion. In addition, the interdiffusion of the sizing and the bulk matrix results in the formation of an interphase. This interphase can alter damage initiation and propagation that can ultimately affect composite performance. The overall objective of the work detailed in this thesis is to ascertain the effects that thermoplastic sizing agents have on composite performance and determine the phenomenological events associated with the effects. All of the thermoplastic sizings had improved processability over the traditional G' sizing. These improvements in processability translated into a composite with less fiber damage and improved surface quality. In addition, all of the thermoplastic sizings outperformed the industrial benchmark sizing G' by at least 25% in static tensile strength, 11% in longitudinal flexure strength, and 30% in short beam shear strength. All moduli were found to be unaffected by the addition of a sizing. The interphase formed in K-90 PVP sized carbon fiber composites was fundamentally predicted from the constitutive properties of K-90 PVP/Derakane™ interdiffusion and fundamental mass transport equations. The K-90 PVP sizing material interdiffusing with the Derakane™ matrix was found to be dissolution controlled. The dissolution diffusion coefficient had an exponential concentration dependence. Fundamental mass transport models were utilized to predict the interphase profile. The predicted K-90 PVP interphase concentration profile displayed steep gradients at the fiber/matrix interface but essentially no gradients at points distant from the fiber surface. The predicted mechanical property profile was essentially flat for the modulus but did show a steep gradient in the strain-to-failure and shrinkage properties. However, the K-90 PVP interphase compared to the unsized/pure Derakane™ interphase showed improvements in strength and strain-to-failure and a reduction in cure shrinkage without significantly affecting the interphase tensile or shear moduli.
Ph. D.
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Jeffers, Ann E. "A Fiber-Based Approach for Modeling Beam-Columns under Fire Loading." Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/38692.

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The work described herein emphasizes a new fiber-based approach to modeling the response of structural frames subjected to realistic fire conditions. The proposed approach involves the development and validation of two finite elements that can be used collectively to simulate the thermal and mechanical response of structural frames at elevated temperatures. To model the thermal response, a special-purpose fiber heat transfer element is introduced. The first of its kind, the fiber heat transfer element uses a combination of finite element and finite difference methods to provide an accurate and highly efficient solution to the three-dimensional thermal problem. To simulate the mechanical response, a flexibility-based fiber beam-column element is used. The element presented here extends the formulation of Taucer et al. (1991) to include thermal effects, geometric nonlinearities, and residual stresses. Both fiber elements are implemented in ABAQUS (2007) using the user-defined element (UEL) subroutine. The element formulations are verified by analyses of benchmark experimental tests and comparisons with traditional finite elements. Results indicate that both elements offer superior accuracy and computational efficiency when compared to traditional methods of analysis. Analyses of structures subjected to non-uniform heating emphasize the advantages of the fiber-based approach. To demonstrate a realistic application of the proposed approach, the work concludes with an investigation of the response of unprotected steel beams subjected to localized fires. Because realistic fires are considered, the treatment of strain reversal upon cooling is also addressed. The analyses are used to demonstrate that the standard fire test is generally unconservative at predicting the time at failure of a structure subjected to realistic fire conditions, since failure depends more on the evolution of temperatures within the steel beams than the duration of fire exposure. The analyses also show that critical temperatures from the standard fire test are conservative and thus offer a better means for predicting failure in steel structures within the scope of the standard fire test.
Ph. D.
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Books on the topic "Fiber element method"

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Mital, Subodh K. Fiber pushout test: A three-dimensional finite element computational simulation. [Washington, D.C.]: NASA, 1990.

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Smith, Joseph-Aime Jean. Evaluation of three dimensional thermal stresses in laminated plates using pseudo three dimensional finite elements. [Downsview, Ont.]: Dept. of Aerospace Science and Engineering, 1985.

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Naik, Rajiv A. Fracture mechanics analysis for various fiber/matrix interface loadings. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1991.

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Gotsis, Pascal K. Progressive fracture of fiber composite build-up structures. [Washington, D.C: National Aeronautics and Space Administration, 1995.

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Gotsis, Pascal K. Progressive fracture of fiber composite build-up structures. [Washington, D.C: National Aeronautics and Space Administration, 1995.

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Gotsis, Pascal K. Progressive fracture of fiber composite build-up structures. [Washington, D.C: National Aeronautics and Space Administration, 1997.

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Gotsis, Pascal K. Progressive fracture of fiber composite build-up structures. [Washington, D.C: National Aeronautics and Space Administration, 1997.

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Chamis, C. C. Computational simulation of structural fracture in fiber composites. [Washington, D.C.]: National Aeronautics and Space Administration, 1990.

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Ko, William L. Thermal and mechanical buckling analysis of hypersonic aircraft hat-stiffened panels with varying face sheet geometry and fiber orientation. [Washington, DC]: National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, 1996.

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Melis, Matthew E. COMGEN, a computer program for generating finite element models of composite materials at the micro level. [Washington, D.C.]: National Aeronautics and Space Administration, 1990.

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Book chapters on the topic "Fiber element method"

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Higuchi, Rie, and Yoshinori Kanno. "Proposal of Various Connecting Methods of Fiber Strands and Finite Element Method Analysis of Strength." In Engineering Plasticity and Its Applications, 143–48. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-433-2.143.

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Kobayashi, Makito, Takuya Jumonji, and Hideaki Murayama. "Three-Dimensional Shape Sensing by Inverse Finite Element Method Based on Distributed Fiber-Optic Sensors." In Lecture Notes in Civil Engineering, 40–48. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-4672-3_3.

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Kitamura, Ryuta. "Simulation of Interfacial Sliding Problem of Fiber Reinforced Composites Using Constraint Conditional Finite Element Method." In Computational and Experimental Simulations in Engineering, 1025–31. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-27053-7_87.

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Shukla, Shilpi, Meena Murmu, and S. V. Deo. "Study on Fracture Parameters of Basalt Fiber Reinforced Concrete Beam by Using Finite Element Method." In Lecture Notes in Civil Engineering, 33–45. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-8433-3_5.

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Nakanishi, Tomoko M. "Real-Time Element Movement in a Plant." In Novel Plant Imaging and Analysis, 109–68. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-4992-6_4.

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AbstractWe developed an imaging method utilizing the available RIs. We developed two types of real-time RI imaging systems (RRIS), one for macroscopic imaging and the other for microscopic imaging. The principle of visualization was the same, converting the radiation to light by a Cs(Tl)I scintillator deposited on a fiber optic plate (FOS). Many nuclides were employed, including 14C, 18F, 22Na, 28Mg, 32P 33P, 35S, 42K, 45Ca, 48V, 54Mn, 55Fe, 59Fe, 65Zn, 86Rb, 109Cd, and 137Cs.Since radiation can penetrate the soil as well as water, the difference between soil culture and water culture was visualized. 137Cs was hardly absorbed by rice roots growing in soil, whereas water culture showed high absorption, which could provide some reassurance after the Fukushima Nuclear Accident and could indicate an important role of soil in firmly adsorbing the radioactive cesium.28Mg and 42K, whose production methods were presented, were applied for RRIS to visualize the absorption image from the roots. In addition to 28Mg and 42K, many nuclides were applied to image absorption in the roots. Each element showed a specific absorption speed and accumulation pattern. The image analysis of the absorption of Mg is presented as an example. Through successive images of the element absorption, phloem flow in the aboveground part of the plant was analyzed. The element absorption was visualized not only in the roots but also in the leaves, a basic study of foliar fertilization.In the case of the microscopic imaging system, a fluorescence microscope was modified to acquire three images at the same time: a light image, fluorescent image, and radiation image. Although the resolution of the image was estimated to be approximately 50 μm, superposition showed the expression site of the transporter gene and the actual 32P-phosphate absorption site to be the same in Arabidopsis roots.
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Chan, C. Y., A. N. Beris, and S. G. Advani. "3-D Simulation of Fiber-Fluid Interactions During Composite Manufacturing Using The Galerkin Boundary Element Method." In Computer Aided Design in Composite Material Technology III, 385–403. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2874-2_26.

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Revanth, Jami Sai, G. Pavan Kumar, P. Phani Prasanthi, K. Sai Phani Teja, A. Rama Satyanaryana, and G. Ashok Kumar. "Failure Load of Jute–Coir Fiber Reinforced Epoxy Matrix Composites Using Micromechanics and Finite Element Method." In Lecture Notes in Mechanical Engineering, 545–55. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-7282-8_40.

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Andriichuk, Oleksandr, Ivan Yasiuk, Serhii Uzhehov, and Oleksandr Palyvoda. "Experimental Research of Strength Characteristics of Steel Fiber Reinforced Concrete Gutters and Modeling of Their Work Using the Finite Element Method." In Lecture Notes in Civil Engineering, 1–8. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-57340-9_1.

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Koshiba, Masanori. "Optical Fibers." In Optical Waveguide Theory by the Finite Element Method, 113–31. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-1634-3_4.

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Koshiba, Masanori. "Polarization-Maintaining Optical Fibers." In Optical Waveguide Theory by the Finite Element Method, 133–60. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-1634-3_5.

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Conference papers on the topic "Fiber element method"

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Conese, Tiziana, Giovanni Barbarossa, and Mario N. Armenise. "Fiber/D-fiber splice: an accurate loss analysis by vectorial finite element method." In Photonics West '95, edited by Mario N. Armenise and Ka-Kha Wong. SPIE, 1995. http://dx.doi.org/10.1117/12.205031.

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Zhang, Dongdong, and Douglas E. Smith. "Finite Element-Based Brownian Dynamics Simulation of Nano-Fiber Suspensions in Nano-Composites Processing Using Monte-Carlo Method." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-88491.

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This paper presents a computational approach for simulating the motion of nano-fibers during polymer nano-composites processing. A finite element-based Brownian dynamics simulation is proposed to solve the motion of nano-fibers suspended within a viscous fluid. In this paper, a Langevin approach is used to account for both hydrodynamic and Brownian effects. We develop a stand-alone Finite Element Method (FEM) for modeling the hydrodynamic effect exerted from the surrounding fluid. The Brownian effects are regarded as the random thermal disturbing forces/torques, which are modeled as a Gaussian process. Our approach seeks solutions using an iterative Newton-Raphson method for the fiber’s linear and angular velocities such that the net forces and torques, i.e. the combination of hydrodynamic and Brownian effects, acting on the fiber are zero. In the Newton-Raphson method, the analytical Jacobian matrix is derived from our finite element model. Fiber motion is then computed with a Runge-Kutta method to update the fiber positions and orientations as a function of time. Instead of re-meshing the fluid domain as fiber moves, we applied the transformed essential boundary conditions on the boundary of fluid domain, so the tedious process of updating stiffness matrix of finite element model is avoided. Since Brownian disturbance from the fluid molecules is a stochastic process, Monte-Carlo simulation is used to evaluate the motion of a great many fibers associated with different random Brownian forces and torques. The final fiber motion is obtained by averaging a numerous fiber motion paths. Examples of fiber motions with various Péclet numbers are presented in this paper. The proposed computational methodology will be used to gain insight on how to control fiber orientations in micro- and nano-polymer composite suspensions in order to obtain the best engineered products.
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Kobayashi, Makito, and Hideaki Murayama. "Shape sensing for pipe structures by inverse finite element method based on distributed fiber-optic sensors." In Optical Fiber Sensors. Washington, D.C.: OSA, 2018. http://dx.doi.org/10.1364/ofs.2018.tue99.

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Medikonda, Sandeep, Ashutosh Srivastava, Amogh Shejwal, and Rajesh Meena. "Compression Molding of Reinforced Plastics Using the Element Free Galerkin (EFG) Method." In ASME 2021 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/imece2021-71605.

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Abstract Composite materials using long fiber-reinforced plastics have seen increased usage in recent times due to their lightweight and better energy absorption characteristics. Compression molding, a high-volume, high-pressure method suitable for molding complex, high-strength fiberglass reinforcement plastics has been widely accepted in the manufacturing industry as an efficient process to mass-produce complicated shapes in a short time. Hence, it is of paramount importance to make this manufacturing process cost-effective and environmentally sustainable. To accomplish this, it becomes very important to understand different behaviors such as the fiber orientation, deformation, axial forces acting on the fibers, stresses occurring in the matrix, punch reaction force, etc. and the use of simulation-led design can help accomplish this with a high degree of accuracy. Considering the extreme high-pressure conditions that the reinforced plastics are subjected to, traditional finite element (FEM) numerical approaches tend to fall short when it comes to compression molding primarily due to severe mesh distortion. In this context, the EFG method has been considered in the current work. EFG, like FEM, is a spatial discretization method however is based on a particle-based approach. The domain of interest is decomposed into material particles and the support domain uses polynom functions to approximate field variables similar to the shape functions used in FEM. Additionally, a background mesh is typically used to integrate the weak forms for the momentum balance. A combination of this theoretical background of EFG, which minimizes the inherent mesh distortion limitation encountered in FEM, coupled with the ability to handle reinforcements and an adaptive mesh refinement method makes this approach suitable for compression molding applications. In this work, an approach to simulate the blank compression with and without fiber reinforcements using the EFG method has been presented. A separate implicit analysis was also carried out to calculate the spring back state of the non-reinforced model to identify the locations of the residual stresses. A 5-layer fiber-reinforced model with an orientation of [0/-45/90/45/0] was embedded into the matrix and the effect of the coupling behaviors between fibers and the matrix on the end deformed shape has also been studied. Primarily, the effect of having no axial resistance for the slip of the fibers versus defining a user-defined slip criterion on the wrinkling behavior has been compared. The approach presented in this work has shown great promise in simulating the compression molding of long fiber reinforced plastics.
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Najafi, A., M. Jalalkamali, S. Moghadamzadeh, and M. A. Bolorizadeh. "Finite Element Method Analysis of Photonic Crystal Fiber Band Structure." In 2010 Symposium on Photonics and Optoelectronics (SOPO 2010). IEEE, 2010. http://dx.doi.org/10.1109/sopo.2010.5504013.

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Bhattacharya, Rakhi, and Nirmal K. Viswanathan. "Optical Vortex in Photonic Crystal Fiber by Finite Element Method." In International Conference on Fibre Optics and Photonics. Washington, D.C.: OSA, 2016. http://dx.doi.org/10.1364/photonics.2016.w2c.4.

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Wei, Yan, Deyuan Chang, and Shuisheng Jian. "Mode analysis of photonic crystal fiber in finite element method with 2." In Passive Components and Fiber-based Devices III. SPIE, 2006. http://dx.doi.org/10.1117/12.688294.

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Alagöz, Çağdaş, M. A. Sahir Arıkan, Ö. Gündüz Bilir, and Levend Parnas. "3-D Finite Element Analysis of Long Fiber Reinforced Composite Spur Gears." In ASME 2000 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/detc2000/ptg-14357.

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Abstract A method and a computer program are developed for 3-D finite element analysis of long fiber reinforced composite spur gears, in which long fibers are arranged along tooth profiles. For such a structure, the gear is composed of two regions; namely the long fiber reinforced and the chopped fiber reinforced regions. Pre and post-processing modules of the program for the finite element analysis are written in Borland Delphi Pascal 3.0®. ABAQUS® is used for finite element analysis. Main inputs for the pre-processing module of the program are, information on basic gear geometry, gear drive data, material properties and long fiber reinforcement geometry. Finite element meshes are automatically generated and mesh information with other required data are written to a file in the input-file-format of ABAQUS®. Stresses are read from the output file of ABAQUS® by the post-processing module, and color-coded drawings for various stresses and failure index are displayed. For the long fiber reinforced region, failure indexes are calculated by using the tensor polynomial failure criterion. Effects of reinforcing thickness and location of long fibers on gear strength are investigated. Stresses and failure index are calculated for different materials and fiber volume ratios.
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Lee, H. J., F. Abdullah, S. D. Emami, and A. Ismail. "Fiber modeling and simulation of effective refractive index for tapered fiber with finite element method." In 2016 IEEE 6th International Conference on Photonics (ICP). IEEE, 2016. http://dx.doi.org/10.1109/icp.2016.7509998.

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Tojaga, V., A. Kulachenko, and S. Östlund. "Embedded Discontinuity Finite Element Method (ED-FEM) for Modeling Fiber Failures in Random Fiber Networks." In 16th edition of the International Conference on Computational Plasticity. CIMNE, 2021. http://dx.doi.org/10.23967/complas.2021.024.

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Reports on the topic "Fiber element method"

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McKee, P. J., Amy M. Dagro, Manuel M. Vindiola, and Jean M. Vettel. Fiber Segment-Based Degradation Methods for a Finite Element-Informed Structural Brain Network. Fort Belvoir, VA: Defense Technical Information Center, November 2013. http://dx.doi.org/10.21236/ada592261.

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Pullammanappallil, Pratap, Haim Kalman, and Jennifer Curtis. Investigation of particulate flow behavior in a continuous, high solids, leach-bed biogasification system. United States Department of Agriculture, January 2015. http://dx.doi.org/10.32747/2015.7600038.bard.

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Recent concerns regarding global warming and energy security have accelerated research and developmental efforts to produce biofuels from agricultural and forestry residues, and energy crops. Anaerobic digestion is a promising process for producing biogas-biofuel from biomass feedstocks. However, there is a need for new reactor designs and operating considerations to process fibrous biomass feedstocks. In this research project, the multiphase flow behavior of biomass particles was investigated. The objective was accomplished through both simulation and experimentation. The simulations included both particle-level and bulk flow simulations. Successful computational fluid dynamics (CFD) simulation of multiphase flow in the digester is dependent on the accuracy of constitutive models which describe (1) the particle phase stress due to particle interactions, (2) the particle phase dissipation due to inelastic interactions between particles and (3) the drag force between the fibres and the digester fluid. Discrete Element Method (DEM) simulations of Homogeneous Cooling Systems (HCS) were used to develop a particle phase dissipation rate model for non-spherical particle systems that was incorporated in a two-fluid CFDmultiphase flow model framework. Two types of frictionless, elongated particle models were compared in the HCS simulations: glued-sphere and true cylinder. A new model for drag for elongated fibres was developed which depends on Reynolds number, solids fraction, and fibre aspect ratio. Schulze shear test results could be used to calibrate particle-particle friction for DEM simulations. Several experimental measurements were taken for biomass particles like olive pulp, orange peels, wheat straw, semolina, and wheat grains. Using a compression tester, the breakage force, breakage energy, yield force, elastic stiffness and Young’s modulus were measured. Measurements were made in a shear tester to determine unconfined yield stress, major principal stress, effective angle of internal friction and internal friction angle. A liquid fludized bed system was used to determine critical velocity of fluidization for these materials. Transport measurements for pneumatic conveying were also assessed. Anaerobic digestion experiments were conducted using orange peel waste, olive pulp and wheat straw. Orange peel waste and olive pulp could be anaerobically digested to produce high methane yields. Wheat straw was not digestible. In a packed bed reactor, anaerobic digestion was not initiated above bulk densities of 100 kg/m³ for peel waste and 75 kg/m³ for olive pulp. Interestingly, after the digestion has been initiated and balanced methanogenesis established, the decomposing biomass could be packed to higher densities and successfully digested. These observations provided useful insights for high throughput reactor designs. Another outcome from this project was the development of low cost devices to measure methane content of biogas for off-line (US$37), field (US$50), and online (US$107) applications.
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AN ANALYTICAL METHOD FOR EVALUATING THE DEFLECTION AND LOAD-BEARING AND ENERGY ABSORPTION CAPACITY OF ROCKFALL RING NETS CONSIDERING MULTIFACTOR INFLUENCE. The Hong Kong Institute of Steel Construction, September 2022. http://dx.doi.org/10.18057/ijasc.2022.18.3.1.

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In this study, an analytical method for evaluating the structural performance, including maximum deflection, load-bearing, and energy absorption capacity of a steel wire-ring net, was proposed to effectively design the ring net of the flexible barrier systems. Puncture tests of the ring nets and two-point traction tests of the three-ring chains with various wire-ring specifications were conducted. Correlation analysis was used to test the results between ring nets and chains, revealing that three structural performance indicators of the test specimens were strongly related. The ring net’s structural performance was affected specifically by ring chains on the shortest load transfer path. Accordingly, a three-ring chain with a flexible boundary corresponded to a fibre–spring element. A three-dimensional analytical model of the ring net was established. Explicit formulas for computing the three indicators of the ring net were derived. Comprehensive quasi-static and impact tests, using different shapes and sizes of punching devices, were conducted, providing valuable data to calibrate and validate this analytical method. The ability of the model in yielding consistent results when implemented at the structure scale was then assessed, based on the data of full-scale impact tests on a 1500kJ-energy rockfall barrier. Lastly, the effects of various factors, such as single ring geometry, the length–width ratio of the net, loading area size, boundary stiffness, and load rate, influencing the structural performance indicators of the ring net were investigated, respectively.
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