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Journal articles on the topic 'Structural analysis (Engineering) Composite materials'

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Published: 4 June 2021
Last updated: 10 February 2022

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1

Garnich, M. R., and A. C. Hansen. "A Multicontinuum Approach to Structural Analysis of Linear Viscoelastic Composite Materials." Journal of Applied Mechanics 64, no. 4 (December 1, 1997): 795–803. http://dx.doi.org/10.1115/1.2788984.

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A “multicontinuum” approach to structural analyses of composites is described. A continuum field is defined to represent each constituent material along with the traditional continuum field associated with the composite. Finite element micromechanics is used to establish relationships between composite and constituent field variables. These relationships uncouple the micromechanics from structural solutions and render an efficient means of extracting constituent information during the course of a finite element structural analysis. Equations are developed for the case of a linear elastic reinforcing material embedded in a linear viscoelastic matrix and verified by comparison with results of finite element micromechanics.
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2

Wood, James. "Composite Materials: Design and Analysis." Composite Structures 17, no. 4 (January 1991): 367–68. http://dx.doi.org/10.1016/0263-8223(91)90027-v.

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3

Strecker, Kurt, Carlos Augusto da Silva, and Sérgio Luiz Moni Ribeiro Filho. "Experimental and Numerical Analysis of Cement Based Composite Materials with Styrofoam Inclusions." Open Construction and Building Technology Journal 10, no. 1 (June 28, 2016): 431–41. http://dx.doi.org/10.2174/1874836801610010431.

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In civil engineering an increasing demand for lightweight concretes exists, because a lower density results in significant benefits for structural elements. Polystyrene foams may be used in the fabrication of lightweight concretes with a large density range. In this work, the influence of fine grained sand (<1mm) additions of 5, 10 and 20% on the properties of a composite consisted of cement with styrofoam inclusions of 20, 40 and 60% has been studied. Finite element analysis (FEA), using Abaqus software package, was carried out to predict numerically the effect of particle size and polystyrene fraction on the compressive strength of the composite materials. The composites were characterized by their density, porosity and compressive strength after 28 days. The density of the composites varied between 1250 and 1600 kg/m3 with a strength of 18 and 9 MPa for 20 and 60% of Styrofoam inclusions, respectively. The increase of the fraction of sand from 5 to 20% promoted the increase in bulk density and modulus of the composites. The effect of the addition of sand on the porosity and mechanical strength exhibited variation indicating the packing factor of the particles as the main responsible for this behavior. Based on the finite element analysis the amount of the stress in the composite increases with the increasing particle diameter. The composites investigated exhibited a uniform distribution of the polystyrene spheres, allowing their use for non-structural purposes.
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Tan, T. M., C. M. Pastore, and F. K. Ko. "Engineering Design of Tough Ceramic Matrix Composites for Turbine Components." Journal of Engineering for Gas Turbines and Power 113, no. 2 (April 1, 1991): 312–17. http://dx.doi.org/10.1115/1.2906564.

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This paper provides a review of the material design concepts for the toughening of ceramic matrix composites by three-dimensional fiber architecture. To establish a communication link between the structural and the materials engineers, an integrated design methodology is presented with an example. Through a Fabric Geometry Model (FGM), the contribution of three-dimensional fiber architecture is translated into a stiffness matrix for finite element structural analysis. With the feedback from the structural analysis, this design methodology provides an effective means to screen reinforcement materials systems for three-dimensional fabric-reinforced composite components.
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5

Beaumont, Peter W. R., and Costas Soutis. "Structural integrity of engineering composite materials: a cracking good yarn." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 374, no. 2071 (July 13, 2016): 20160057. http://dx.doi.org/10.1098/rsta.2016.0057.

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Predicting precisely where a crack will develop in a material under stress and exactly when in time catastrophic fracture of the component will occur is one the oldest unsolved mysteries in the design and building of large-scale engineering structures. Where human life depends upon engineering ingenuity, the burden of testing to prove a ‘fracture safe design’ is immense. Fitness considerations for long-life implementation of large composite structures include understanding phenomena such as impact, fatigue, creep and stress corrosion cracking that affect reliability, life expectancy and durability of structure. Structural integrity analysis treats the design, the materials used, and figures out how best components and parts can be joined, and takes service duty into account. However, there are conflicting aims in the complete design process of designing simultaneously for high efficiency and safety assurance throughout an economically viable lifetime with an acceptable level of risk. This article is part of the themed issue ‘Multiscale modelling of the structural integrity of composite materials’.
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Kokurov, A. M., and I. N. Odintsev. "Analysis of structural elements made of composite materials with defects." Russian Aeronautics 60, no. 1 (January 2017): 21–26. http://dx.doi.org/10.3103/s1068799817010044.

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7

Kline, R. A., G. Cruse, A. G. Striz, and E. I. Madaras. "Integrating NDE-derived engineering properties with finite element analysis for structural composite materials." Ultrasonics 31, no. 1 (January 1993): 53–60. http://dx.doi.org/10.1016/0041-624x(93)90033-v.

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8

Kemalov, Alim Feizrakhmanovich, Ruslan Alimovich Kemalov, Dinar Zinnurovich Valiev, and Ilmira Maratovna Abdrafikova. "Structural Dynamic Study of Roof Waterproofing Materials." Modern Applied Science 8, no. 5 (August 17, 2014): 115. http://dx.doi.org/10.5539/mas.v8n5p115.

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The present research was aimed to develop the scientific applied principles and technologies of composite bituminous materials for civil engineering based on the investigation of the structures of polymer modifier and bitumen-polymer binder (BPB) on its basis with the use of nuclear magnetic resonance (NMR). The method of pulsed NMR was chosen as one of the rapid analysis methods that can be used for the analysis of bitumen-polymer systems, especially when assessing the group chemical composition of residual oil feedstock (ROF), bitumens and composite materials based on them. Using the method of pulsed NMR the regularities of the impact of modifier component composition on the changes of structural-group composition of the original and modified products were specified. Based on the results of research the optimal ratio of bitumen-polymer binder components was investigated, the manufacturability of the process for obtaining of composite bituminous materials for civil engineering with the aim of optimizing the quality of the final products was evaluated. Pulsed NMR - spectroscopy is suggested as input and output quality control of bituminous products. The regularities of redistribution of the phases with different molecular mobility and their relationship with the binder components were investigated. Rapid technique for quantifying the content of polymer in the solvent was developed.
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9

Kumar, R. Ramesh, G. Vinod, S. Renjith, G. Rajeev, M. K. Jana, and R. Harikrishnan. "Thermo-structural analysis of composite structures." Materials Science and Engineering: A 412, no. 1-2 (December 2005): 66–70. http://dx.doi.org/10.1016/j.msea.2005.08.065.

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10

Mastrogiannakis, Iakovos, and George-Christopher Vosniakos. "EXPLORING STRUCTURAL DESIGN OF THE FRANCIS HYDRO-TURBINE BLADES USING COMPOSITE MATERIALS." Facta Universitatis, Series: Mechanical Engineering 18, no. 1 (March 27, 2020): 043. http://dx.doi.org/10.22190/fume190609001m.

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Composite materials are increasingly exploited in industry especially replacing metallic structures due to their strength/weight ratio. Amongst the notable applications, for which composite materials have not challenged metals yet are hydro-turbines, which are overwhelmingly made of steel or copper alloys. Replacing blade material by laminate composites can reduce weight and inertia, as well as achieve smaller cross-sectional thicknesses, better fatigue strength, damping, and resistance to cavitation. Manufacturing techniques are mature enough to respond to the challenge, provided that the laminate composite blades are properly designed. In the current work, the design of the Francis carbon blades was studied by employing finite element analysis. The blades were designed sub-optimally with various stratification patterns and different failure and maximum displacement limitations following a systematic methodology for gradual addition of laminate layers or patches. The methodology is still of a trial and error nature driven by the designer but guesses in the individual steps are much more informed due to model analysis and optimization tools available.
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11

A R, Sreadha, and Chitaranjan Pany. "Static, Free Vibration and Buckling Analysis of Composite Panels; A Review." Advanced Journal of Graduate Research 9, no. 1 (November 27, 2020): 21–45. http://dx.doi.org/10.21467/ajgr.9.1.21-45.

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A composite material is generally a combination of materials differing in composition or form on a macro scale for the purposes of attaining specific characteristics and properties. The developments in the field of composite materials have granted significant weight reduction in structural design. When compared to metallic materials, composites offer many advantages, especially high strength, stiffness to weight ratio, excellent fatigue properties, and corrosion resistance. Plates, curved panels, the cylindrical shell-shaped forms of models are being broadly used in many structural packages of engineering structure. For design the structure, it is important to know the behaviour of these under static, free vibration, buckling condition. The present paper aims to review the literature on static, free vibration, and buckling analysis of composite flat panel, curved panel, and cylindrical shell. Further, the testing procedure of laminate, design guidelines of laminates and cost estimations with mechanical properties comparison of laminate with metal, CLT (classical lamination theory) basis including thermal and moisture expansion for stiffness evaluation are also summarised in this paper.
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12

TALREJA, R. "Damage analysis for structural integrity and durability of composite materials." Fatigue Fracture of Engineering Materials and Structures 29, no. 7 (July 2006): 481–506. http://dx.doi.org/10.1111/j.1460-2695.2006.00974.x.

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13

Petrů, Michal, Ladislav Ševčík, Aleš Lufinka, and Martina Syrovátková. "Experimental Analysis and Study of the Shock Absorption of Carbon Composite." Applied Mechanics and Materials 827 (February 2016): 157–60. http://dx.doi.org/10.4028/www.scientific.net/amm.827.157.

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Composite materials are a regular part of many industries - aerospace, automotive, mechanical engineering. Lower weight and comparable in some ways even better mechanical properties, are the reason why composites progressively substitute traditional metal based material. The article describes the design of composite tub with metal reinforcement. Compares the theoretical and real output of sample produced from CF prepreg specially designed for absorbing the energy during crash impact. The results show that the sample due to its deformation is able to absorb some energy and become a material usable in structural applications.
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14

Lua, James, Christopher T. Key, Shane C. Schumacher, and Andrew C. Hansen. "Rate Dependent Multicontinuum Progressive Failure Analysis of Woven Fabric Composite Structures under Dynamic Impact." Shock and Vibration 11, no. 2 (2004): 103–17. http://dx.doi.org/10.1155/2004/742085.

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Marine composite materials typically exhibit significant rate dependent response characteristics when subjected to extreme dynamic loading conditions. In this work, a strain-rate dependent continuum damage model is incorporated with multicontinuum technology (MCT) to predict damage and failure progression for composite material structures. MCT treats the constituents of a woven fabric composite as separate but linked continua, thereby allowing a designer to extract constituent stress/strain information in a structural analysis. The MCT algorithm and material damage model are numerically implemented with the explicit finite element code LS-DYNA3D via a user-defined material model (umat). The effects of the strain-rate hardening model are demonstrated through both simple single element analyses for woven fabric composites and also structural level impact simulations of a composite panel subjected to various impact conditions. Progressive damage at the constituent level is monitored throughout the loading. The results qualitatively illustrate the value of rate dependent material models for marine composite materials under extreme dynamic loading conditions.
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15

Kiang, H. J., and C. K. H. Dharan. "Analysis of Composite Stretched-Membrane Heliostats." Journal of Solar Energy Engineering 111, no. 2 (May 1, 1989): 103–11. http://dx.doi.org/10.1115/1.3268294.

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The stretched-membrane concept has the potential for reducing the cost of heliostats used for solar thermal energy generation in central receiver systems. In this concept, a high strength/structural membrane carrying the reflective film is stretched uniformly on a toroidal frame. The resulting structure has high stiffness and is structurally efficient. It is practically suitable for composite materials, since the loading is primarily in-plane. In this paper, the application of composite materials to stretched-membrane heliostat design is investigated. The results of the analysis show that composite materials for both the membrane and the frame exhibit significant advantages over metals. These include high strength-to-weight design, higher resistance to wind-induced deformation, the possibility of independently tailoring bending and torsional stiffness, and better transportability.
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16

Lukić, S., and P. Jovanić. "Structural analysis of abrasive composite materials with nonwoven textile matrix." Materials Letters 58, no. 3-4 (January 2004): 439–43. http://dx.doi.org/10.1016/s0167-577x(03)00521-4.

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17

Berthelot, Jean-Marie, Mustapha Assarar, Youssef Sefrani, and Abderrahim El Mahi. "Damping analysis of composite materials and structures." Composite Structures 85, no. 3 (October 2008): 189–204. http://dx.doi.org/10.1016/j.compstruct.2007.10.024.

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18

Parent, S., and P. Labossière. "Finite element analysis of reinforced concrete columns confined with composite materials." Canadian Journal of Civil Engineering 27, no. 3 (June 1, 2000): 400–411. http://dx.doi.org/10.1139/l99-065.

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The use of composite materials in civil engineering, especially for the strengthening and retrofitting of existing structural elements, is a domain that is growing at a fast pace. The rapid expansion of the structural repair business has already provided numerous opportunities to demonstrate the potential of these materials. However, it has also indicated the need to better understand their properties and the necessity of reliable models to predict the behaviour of repaired structures and the long-term response of those materials considering the effects of freeze and thaw or UV exposure. This article presents a model to predict the ultimate load of a reinforced concrete column confined with composite materials without post-peak response. In addition to the ultimate load, the model identifies the evolution of stresses and strains in the column during the entire loading process. Calculations are made under constant axial and incremental lateral load. The finite element calculations presented here are based on the use of bar elements. These are numerically integrated, considering the appropriate behaviour of the materials in the section of the column. Special attention was paid to the development of a stress-strain relationship representative of the actual behaviour of concrete confined with composite materials.Key words: composite materials, reinforced concrete column, repair, modelling.
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19

Mansoor, Muhammad, Noveed Ejaz, Liaqat Ali, and Hamid Zaigham. "Structural Analysis of Al-CNT Nanocomposite Using X-Ray Diffraction." Key Engineering Materials 875 (February 2021): 138–45. http://dx.doi.org/10.4028/www.scientific.net/kem.875.138.

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The development of metal-matrix composites (MMCs) has mainly been driven by the growing needs of modern applications for lightweight materials yet strong enough to withstand high service loading. On the other hand, carbon nanotubes (CNTs) presenting excellent combination of mechanical and physical properties have already performed as an excellent strengthening to reinforce MMCs. In present study, an air induction furnace was used to fabricate aluminum-multiwall carbon nanotubes (Al-MWCNTs) composite. The process was benefited for better dispersion of the CNTs, which was validated during microscopic studies. Additionally, the mechanical properties were significantly augmented i.e., the yield strength from 64±3 to 115±2 MPa, the tensile strength from 82±2 to 125±3 MPa for matrix material and Al-CNTs composite, respectively. The structural analysis including, grain size, crystallite strain and dislocation density were investigated using X-ray diffraction to relate with the improvement in the properties.
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20

Kopparthi, Phaneendra Kumar, Srikar Gemaraju, Bhaskara Rao Pathakokila, and Suresh Gamini. "Failure analysis of delaminated carbon/epoxy composite under pure bending: validation with numerical analysis." Multidiscipline Modeling in Materials and Structures 17, no. 5 (July 6, 2021): 974–89. http://dx.doi.org/10.1108/mmms-01-2021-0015.

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PurposeDelamination is a common and crucial damage mode which occurs during manufacturing of layered composites or their service life. Its existence leads to degradation in mechanical properties or even structural failure of composites. Hence, the purpose of this article is to study the effect of induced delamination on flexural performance of CFRP composites.Design/methodology/approachIn this article, the flexural behaviors of intact and delaminated carbon/epoxy laminates were investigated under pure bending. A circular PTFE film was introduced during fabrication to create artificial delamination. Moreover, finite element models were developed for intact and delaminated composites using ANSYS. The created models were discretized using 3D structural eight node solid elements.FindingsThe delamination influenced considerably flexural properties of composite. The composite exhibited a linear elastic nature prior to the damage of top ply on the compression side. The flexural strength and stiffness of the composite reduced to 44.5% and 18.2% respectively due to the existence of artificial delamination. The results of four point bending experiments and finite element analysis agreed for both intact and delaminated composites within acceptable error. Finally for same composites, first ply failure analysis was carried out using Tsai-Hill, Tsai-Wu and Hashin failure criteria.Originality/valueIn pure bending, beam section of the middle portion is free from shear. It is not so in case of three-point bending. Hence, the effect of embedded artificial defect on bending performance of CFRP composite due to pure bending has been investigated.
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21

Chitturi, Sai Krishna, A. A. Shaikh, and Alpesh H. Makwana. "Static analysis of thermoset-thermoplastic-based hybrid composite." International Journal of Structural Integrity 11, no. 1 (August 7, 2019): 107–20. http://dx.doi.org/10.1108/ijsi-05-2019-0046.

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Purpose A growing response in the development of hybrid composites to conquer the deficiency of neat composites has provoked doing this work. Thermoplastic Polycarbonate material offers better impact toughness with low structural weight. There is a little/no information available over the selected sandwich hybrid composite prepared from woven E-Glass and polycarbonate sheet. The purpose of this paper is to understand the response of the novel hybrid structure under tensile, flexural, interlaminar shear and impact loading conditions. Design/methodology/approach The hand-layup technique is used for fabricating the hybrid composites in the laminate configuration. The hybrid composites are prepared with a total fiber content of 70 percent weight fractions. The effect of the percentage of reinforcement on mechanical properties is evaluated experimentally as per American society for testing materials standard test methods. The damaged mechanisms of failed samples and fractured surfaces are well analyzed using vision measuring system and scanning electron microscopy. Findings A decline in densities of hybrid composites up to 22.5 percent is noticed with reference to neat composite. An increase in impact toughness up to 40.73 percent is marked for hybrid laminates owing to the ductile nature of PC. Delamination is identified to be the major mode of failure apart from fiber fracture/pull-out, matrix cracking in all the static loading conditions. Originality/value The response of novel hybrid composite reported has been explored for the first time in this paper. The outcome of experimental work revealed that hybridization offered lightweight structures with improved transverse impact toughness as compared to conventional composite.
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22

Suresh, J. K., C. Venkatesan, and V. Ramamurti. "Structural dynamic analysis of composite beams." Journal of Sound and Vibration 143, no. 3 (December 1990): 503–19. http://dx.doi.org/10.1016/0022-460x(90)90739-m.

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23

Morrison, Andrew, Mark Garnich, and Ray S. Fertig. "Reliability analysis of a woven composite Pi-joint structure." Journal of Composite Materials 51, no. 29 (March 9, 2017): 4101–14. http://dx.doi.org/10.1177/0021998317696343.

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The finite element (FE) method combined with multicontinuum theory (MCT) for analyzing composites was coupled with reliability analysis to develop a probabilistic, progressive failure, multiscale analysis of a three-dimensional braided composite Pi-joint subject to shear loading. The constituent engineering constants, ply strengths, and structural geometric parameters were treated as random variables. Failure was defined in the progressive failure framework as a minimum structure stiffness. NESSUS reliability analysis, HELIUS MCT, and Abaqus® FE analysis software packages were interfaced to create a global framework for performing multiscale reliability analysis of the composite structure. The reliability analysis resulted in the calculation of the probability of failure and sensitivities of the probability of failure to the random variables defined in the model. The model's probability of failure was most sensitive to the geometric parameters defining the thickness of the upright portion of the Pi-joint and the depth of the Pi-joint. The model's response was also sensitive to the compressive strength of the composite.
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Park, Yong-Bin, Khanh-Hung Nguyen, Jin-Hwe Kweon, Jin-Ho Choi, and Jong-Su Han. "Structural Analysis of a Composite Target-drone." International Journal of Aeronautical and Space Sciences 12, no. 1 (March 30, 2011): 84–91. http://dx.doi.org/10.5139/ijass.2011.12.1.84.

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25

Imura, Makoto, Tetsusei Kurashiki, Hiroaki Nakai, and Masaru Zako. "A Multi-Scale Analysis for an Evaluation of the Mechanical Properties of Composite Materials." Key Engineering Materials 334-335 (March 2007): 585–88. http://dx.doi.org/10.4028/www.scientific.net/kem.334-335.585.

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Fiber reinforced composite materials have been applied widely to many structures, because they have some advantages like easy handling, high specific strength, etc. The numerical method like finite element method has been applied to design and to evaluate the material properties and behavior as the development of Computer Aided Engineering. It is very difficult to calculate with accuracy not only in structural scale but also in detail material scale (for example, the order of fiber diameter) by the traditional FEM, becausecompositematerials like woven fabric composites have the geometrical complexityand the large difference between above mentioned scales. The development of multi-scale analysis method is one of the major topics in computational mechanics. Mesh superpositionis one of multi-scale analysis methods and is an effective method to solve the problems which have the large difference between the structure scale and the reinforcement scale. We have expanded the finite element mesh superposition method with 3 scales and have defined as M3 (Macro-Meso-Micro) method. In this paper, we have proposed a new approach method combined with M3 method and homogenized method to obtain the mechanical properties and to simulate the behavior of woven fabric composites. In addition, the elastic-plastic mechanics and the damage mechanics have been introduced into M3 method to investigate the effects of matrix-crack on the structural and material properties. From the numerical results, it is revealed that it is very useful for the evaluation of mechanical properties of composite materials.
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26

Dong, Chen Song. "Dimensional Variations of General Curved Composite Parts." Advanced Materials Research 41-42 (April 2008): 377–83. http://dx.doi.org/10.4028/www.scientific.net/amr.41-42.377.

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With the increasing demands of energy efficiency and environment protection, composite materials have become an important alternative for traditional materials. Composite materials offer many advantages over traditional materials including: low density, high strength, high stiffness to weight ratio, excellent durability, and design flexibility. Despite all these advantages, composite materials have not been as widely used as expected because of the complexity and cost of the manufacturing process. One of the main causes is associated with poor dimensional control. General curved composite parts are often used as the structural components in the composite industry. Due to the anisotropic material nature, process-induced dimensional variations make it difficult for tighttolerance control and limit the use of composites. This research aims to develop a practical approach for the design of general curved composite parts and assembly. First, the closed-form solution for the process-induced dimensional variations, which is commonly called spring-in, was derived. For a general curved composite part, a Structural Tree Method (STM) was developed to divide the curve into a number of pieces and calculate the dimensional variations sequentially. This method can be also applied to an assembly of composite parts. The approach was validated through a case study. The method presented in this paper provides a convenient and practical tool for the dimensional and tolerance analysis in the early design stage of general curved composite parts and assembly, which is extremely useful for the realization of affordable tight tolerance composites. It also provides the foundation of Integrated Product/Process Development (IPPD) and Design for Manufacturing/Assembly (DFM/DFA) for composites.
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Oromiehie, Ebrahim, Ulf Garbe, and B. Gangadhara Prusty. "Porosity analysis of carbon fibre-reinforced polymer laminates manufactured using automated fibre placement." Journal of Composite Materials 54, no. 9 (September 23, 2019): 1217–31. http://dx.doi.org/10.1177/0021998319875491.

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Automated fibre placement-based manufacturing technology is increasingly being used in several engineering applications. Manufacture of carbon fibre-reinforced plastic’s small/large structures have been made possible due to its remarkable capabilities like productivity and accuracy. Nevertheless, making high-quality composite laminate using automated fibre placement relies on the proper selection of critical processing variables to avoid internal flaws during the fibre placement process. Consequently, a reliable non-destructive inspection technique is required for quality assurance and structural integrity of fabricated laminates. Neutron radiography/tomography offers unique imaging capabilities over a wide range of applications including fibre-reinforced polymer composites. The application of this technique towards tomographic reconstruction of automated fibre placement-made thermoplastic composites is presented in this paper. It is shown that the porosity analysis using neutron imaging technique provides reliable information. Additionally, using such technique valuable data regarding the size and the location of the voids in the laminate can be acquired and informed. This will assist the composite structural analysts and designers to select the appropriate processing parameters towards a defect free automated fibre placement part manufacture.
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28

Meunier, M., and R. A. Shenoi. "Free vibration analysis of composite sandwich plates." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 213, no. 7 (July 1, 1999): 715–27. http://dx.doi.org/10.1177/095440629921300707.

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The fibre reinforced plastic (FRP) composite materials configured as sandwich panels are finding increased usage in a variety of structural applications. An important facet in correct usage is an understanding of the dynamic behaviour of such structural configurations. This paper addresses the issue of natural frequencies of sandwich plate panels. The closed-form solutions are obtained using Reddy's first- and higher-order shear deformation theories. The approaches are validated against results from a standard, commercially available finite element analysis package. The paper concludes with a detailed investigation of the influence of variation in material property parameters and plate geometry variables on the natural frequency.
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29

Sadananda, Ramana. "A probabilistic approach to bone fracture analysis." Journal of Materials Research 6, no. 1 (January 1991): 202–6. http://dx.doi.org/10.1557/jmr.1991.0202.

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Bones are biological structural materials made of dynamically adaptable tissues. They can be considered as complex natural composite materials with load bearing constituents such as osteons and interstitial lamellae cemented with weak bonding materials. In addition, they contain Haversian and Volkmann canals that are functionally needed but are structurally weak. Because of large variation in microstructure, the strength of a bone varies from bone to bone and animal to animal. In this study the applicability of Weibull statistics to fracture strength of bones has been evaluated. The statistics is based on the weakest link theory and has been used successfully for probabilistic design of critical engineering structural components. The analysis shows that the statistics is valid when applied to each type of bone and it differentiates data from different types of bones. The analysis provides an insight in terms of how nature designs its load bearing structures by the process of natural selection.
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Duffy, S. F., J. L. Palko, and J. P. Gyekenyesi. "Structural Reliability Analysis of Laminated CMC Components." Journal of Engineering for Gas Turbines and Power 115, no. 1 (January 1, 1993): 103–8. http://dx.doi.org/10.1115/1.2906663.

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For laminated ceramic matrix composite (CMC) materials to realize their full potential in aerospace applications design, methods and protocols are a necessity. This paper focuses on the time-independent failure response of these materials and presents a reliability analysis associated with the initiation of matrix cracking. It highlights a public domain computer algorithm that has been coupled with the laminate analysis of a finite element code and which serves as a design aid to analyze structural components made from laminated CMC materials. Issues relevant to the effect of the size of the component are discussed, and a parameter estimation procedure is presented. The estimation procedure allows three parameters to be calculated from a failure population that has an underlying Weibull distribution.
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31

Metin, Erol S., and Osman T. Inal. "Structural analysis of a TiAl3 + ZrO2 particulate composite." Materials Science and Engineering: A 148, no. 1 (November 1991): 115–22. http://dx.doi.org/10.1016/0921-5093(91)90871-j.

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32

Tysmans, Tine, and Jan Wastiels. "Editorial on Special Issue “Textile-Reinforced Cement Composites: New Insights into Structural and Material Engineering”." Applied Sciences 10, no. 2 (January 13, 2020): 576. http://dx.doi.org/10.3390/app10020576.

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This special issue presents the latest advances in the field of Textile-Reinforced Cement Composites, including Textile-Reinforced Concrete (TRC), Textile-Reinforced Mortar (TRM), Fabric-Reinforced Cementitious Matrix (FRCM), etc. These composite materials distinguish themselves from other fibre reinforced concrete materials by their strain-hardening behaviour under tensile loading. This Special Issue is composed of 14 papers covering new insights in structural and material engineering. The papers include investigations on the level of the fibre reinforcement system as well as on the level of the composites, investigating their impact and fatigue behaviour, durability and fire behaviour. Both strengthening of existing structures and development of new structural systems such as lightweight sandwich systems are presented, and analysis and design methods are discussed. This Special Issue demonstrates the broadness and intensity of the ongoing advancements in the field of Textile-Reinforced Cement composites and the importance of several future research directions.
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Cheng, Tai Hong, Il Soo Kim, Soon Young Park, Zhen Zhe Li, and Yun De Shen. "Structural Stability Analyses of Composite Laminate Wind Turbine." Advanced Materials Research 287-290 (July 2011): 1486–91. http://dx.doi.org/10.4028/www.scientific.net/amr.287-290.1486.

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The paper describes a structural stability analysis of fiber reinforced 10kW composite laminate wind turbine blades by using finite element method. The E-glass/epoxy orthotropic materials DB300、DBL850、L900 were employed for construction of a composite laminate shell structure. The composite laminate sheel structures were constructed by two types of lamination method. The rotating effect of wind blade was considered using the linear and the nonlinear static analysis. The results of the nonlinear analysis of displacement and stress show much lower than the linear analysis, because of the geometry nonlinear effect. From the contours of stress and displacement, the maximum stress appeared at the root of the blade, and maximum deformation occurred at the tip of the blade. Finally, the modal properties of the wind blade was investigated, including the natural frequency, modeshaps, and the centrifugal effect.
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You, Feng Xiang, Fei Zhang, and Buo Lei Zuo. "Random Response Analysis for Nonlinear Systems of Composite Laminates." Advanced Materials Research 415-417 (December 2011): 56–61. http://dx.doi.org/10.4028/www.scientific.net/amr.415-417.56.

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Geometric parameters of composite materials often have a random nature in engineering structures. How to study random response and statistical properties of nonlinear systems with random parameters has a very important significance for reliability and optimization of structural design. In this paper, perturbation method and random central difference method are explored to establish composite nonlinear vibration equations and computational model to study random responses of nonlinear systems with random parameters under deterministic loading of the composite laminates, numerical examples illustrate the correctness of the algorithm.
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35

Mawassy, Nagham, Hilal Reda, Jean-Francois Ganghoffer, and Hassan Lakiss. "Wave propagation analysis in non-local flexoelectric composite materials." Composite Structures 278 (December 2021): 114696. http://dx.doi.org/10.1016/j.compstruct.2021.114696.

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Majzner, Michał, and Andrzej Baier. "Computer Modeling and Research of FML Composites Using the Method of Features." Solid State Phenomena 220-221 (January 2015): 837–42. http://dx.doi.org/10.4028/www.scientific.net/ssp.220-221.837.

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The use of modern materials, such as composite materials, enabling the production of new or modifying the existing design solutions, and improvement of their technical characteristics in their use in the design, engineering and manufacturing process, allows achieving an improvement of their endurance, physical and chemical properties to match the features and functionality that comply with assumptions. In research studies, it has been proposed to systematize and formalize features in the context of modeling and fabrication of objects created on the basis of structural fiber composites. The result of the study and analysis will be precisely adapted algorithm of the design and construction process and also fabrication of the structural objects made upon using composite materials. The process of multicriteria optimization and stress analysis upon using CAx-class software will enable to reduce the probability of failure or damage to the modified component.
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37

Ahmad, M., and F. A. Kamke. "Analysis of Calcutta bamboo for structural composite materials: physical and mechanical properties." Wood Science and Technology 39, no. 6 (August 4, 2005): 448–59. http://dx.doi.org/10.1007/s00226-005-0016-y.

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Li, Jian Zhi, Yan Liang Du, and B. C. Sun. "Finite Element Analysis of Interfacial Stress for Fiber Reinforced Composite Cable Wire Based on FBG." Advanced Materials Research 216 (March 2011): 86–90. http://dx.doi.org/10.4028/www.scientific.net/amr.216.86.

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Whenever embedded in materials, optical fibers can be regarded as foreign entities to host structure, which inevitably perturbs instinct structural morphology in a local continuum. This work reports a set of finite element analysis (FEA) on an intelligent hybrid fiber composite cable wire with embedded fiber Bragg grating (FBG). The authors tend to provide a comprehensive investigation on interfacial stress of intelligent hybrid fiber composites wire embedded FBG sensor during their working period.
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González-Estrada, Octavio Andrés, Germán Díaz, and Jabid E. Quiroga Mendez. "Mechanical Response and Damage of Woven Composite Materials Reinforced with Fique." Key Engineering Materials 774 (August 2018): 143–48. http://dx.doi.org/10.4028/www.scientific.net/kem.774.143.

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In this paper, we present the experimental and numerical modelling for the mechanical behaviour of woven composites reinforced with fique (furcraeaselloa) fibre, for different fique fibre woven configurations embed in an R744 epoxy matrix. The woven configurations are taken from commercial models and their mechanical properties validated by experimental data. We perform experimental tests using ASTM D3039 for the tensile response. We obtain values for Young’s modulus, ultimate strength, and deformation of unidirectional and woven reinforced composites. Scanning electron microscopy (SEM) is used for the fractographic analysis of the reinforced specimens. For the numerical model of the woven composite, we use the Texgen software to define the finite element voxel model and to estimate orthotropic mechanical parameters. Then, we determine the equivalent elastic properties of the composite, according to the materials and the fibre-matrix relations. We compare and validate the numerical results with the experimental data. We obtain stress and strain fields for the yarns and the matrix. The objective of this work is to establish a baseline of the mechanical behaviour of these natural reinforced composites to propose applications for structural engineering.
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Nam, Jeong Hun, Seung Sik Lee, Soon Jong Yoon, Dong Min Ok, and Ju Bum Kim. "Structural Behavior of Polymer Mortar GFRP Composite Pipe." Advanced Materials Research 26-28 (October 2007): 341–44. http://dx.doi.org/10.4028/www.scientific.net/amr.26-28.341.

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This paper presents the results of experimental and analytical investigations on the behavior of GFRP pipes used in the water supply pipeline systems. The pipes consist of two filament wound outer GFRP tubes and polymer mortar between the tubes. Parallel plate loading tests were conducted and the test results were compared with predicted results. The load-deflection prediction was conducted by the FE analysis and the conventional strength of materials approach. It was shown that the results obtained by the experiment and analysis were agreed well.
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41

Sathishkumar, GK, G. Rajkumar, K. Srinivasan, and MJ Umapathy. "Structural analysis and mechanical properties of lignite fly-ash-added jute–epoxy polymer matrix composite." Journal of Reinforced Plastics and Composites 37, no. 2 (October 19, 2017): 90–104. http://dx.doi.org/10.1177/0731684417735183.

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The role of lignite fly ash in determining the physical properties of polymer matrix composite is studied in the present investigation. For that, different compositions of polymer matrix composite were prepared using epoxy polymer resin with lignite fly ash and jute fiber in the combination of (90 − x) EP − 10 JF − xLFA (where x = 0, 0.5, 1, 1.5, 2, and 2.5 wt.%) through hand layup technique followed by light compression molding technique. The changes in the physical properties of polymer matrix composite, when fly ash was added, were found to be quite interesting. A linear increase in mechanical strength such as compressive strength, tensile strength, flexural strength, impact energy, and barcol hardness was observed up to the addition of 2 wt.% fly ash content in the polymer matrix composite. Scanning electron microscope image of the composite sample EPJF2.0 showed the distribution of the fly ash, minimal voids, and fiber pullouts presented at the fractured surface. Of all the prepared polymer matrix composites, the sample EPJF2.0 showed a higher mechanical strength and better thermal stability than the other samples.
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42

CHONG, WOO SUK, MI YEON SHIN, and CHANG HO YU. "STRUCTURAL ANALYSIS OF CARBON COMPOSITE FRAME FOR FOLDABLE ELECTRIC WHEELCHAIR DEVELOPMENT." Journal of Mechanics in Medicine and Biology 19, no. 07 (November 2019): 1940045. http://dx.doi.org/10.1142/s0219519419400451.

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Electric wheelchairs developed so far have difficulties for elderly people to use, because of their bulkiness and heavy weight. To address this problem, this study presents a design for the construction of an electric wheelchair with an application of light duty materials at frame and a foldable structure that can be easily loaded in a narrow space. A structural analysis was performed to evaluate the structural safety of the foldable wheelchair. For the purpose of analysis, a carbon composite was used as the material for the frame; Structure Mechanics Module of COMSOL Multiphysics was used as the analysis software; and for the boundary condition, the lower part of the body frame was fixed, and a load of 150[Formula: see text]kg was applied to the upper part of the wheelchair. According to the results of the structural analysis, a maximum displacement of 2.869[Formula: see text]mm occurred at the handle where the carbon composite was applied, and tensile and compressive stress of 103[Formula: see text]MPa and 107.3[Formula: see text]MPa, respectively, were measured at the seat part of the wheelchair where the load was applied. The safety factors were 7.5 and 5.5 for tensile stress and compressive stress, respectively. A maximum variation of 0.0872[Formula: see text]mm occurred at the aluminum wheel shaft, and a maximum variation of 0.2046[Formula: see text]mm occurred at the joint. The maximum stress was 116.3[Formula: see text]MPa that corresponded to a safety factor of 2.66; this indicates that the wheelchair can be considered to be structurally safe as the safety factor exceeds the initial target of 2.
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43

Helal, Mahmoud, and Elsayed Fathallah. "Finite element analysis and design optimization of a non-circular sandwich composite deep submarine pressure hull." Materials Testing 62, no. 10 (November 1, 2020): 1025–32. http://dx.doi.org/10.1515/mt-2020-621011.

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Abstract Diving depth is the criteria for designing the submarine pressure hull meant to achieve a definite collapse depth. In this study, a methodology to optimize a sandwich composite deep pressure hull is presented. Buoyancy factor (BF) minimization is considered as an objective function. The optimization process is achieved by ANSYS parametric design language (APDL). Composites failure criteria and structural stability are considered as constraints. Additionally, sensitivity analyses were conducted to analyze the effects of geometric parameters on optimal structural design. The results showed that, the utilization of a sandwich composite pressure hull for a deep submarine at extreme depths is not safe. Additionally, the results propose that the submarine designed should be able to operate at a maximum diving depth of up to 7500 m.
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44

Irez, Alaeddin Burak, Emin Bayraktar, and Ibrahim Miskioglu. "Fracture Toughness Analysis of Epoxy-Recycled Rubber-Based Composite Reinforced with Graphene Nanoplatelets for Structural Applications in Automotive and Aeronautics." Polymers 12, no. 2 (February 14, 2020): 448. http://dx.doi.org/10.3390/polym12020448.

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This study proposes a new design of lightweight and cost-efficient composite materials for the aeronautic industry utilizing recycled fresh scrap rubber, epoxy resin, and graphene nanoplatelets (GnPs). After manufacturing the composites, their bending strength and fracture characteristics were investigated by three-point bending (3PB) tests. Halpin–Tsai homogenization adapted to composites containing GnPs was used to estimate the moduli of the composites, and satisfactory agreement with the 3PB test results was observed. In addition, 3PB tests were simulated by finite element method incorporating the Halpin–Tsai homogenization, and the resulting stress–strain curves were compared with the experimental results. Mechanical test results showed that the reinforcement with GnPs generally increased the modulus of elasticity as well as the fracture toughness of these novel composites. Toughening mechanisms were evaluated by SEM fractography. The typical toughening mechanisms observed were crack deflection and cavity formation. Considering the advantageous effects of GnPs on these novel composites and cost efficiency gained by the use of recycled rubber, these composites have the potential to be used to manufacture various components in the automotive and aeronautic industries as well as smart building materials in civil engineering applications.
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45

Patel, B. P., A. V. Lele, M. Ganapathi, S. S. Gupta, and C. T. Sambandam. "Thermo-flexural analysis of thick laminates of bimodulus composite materials." Composite Structures 63, no. 1 (January 2004): 11–20. http://dx.doi.org/10.1016/s0263-8223(03)00120-x.

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46

Argyris, John, and Lazarus Tenek. "Recent Advances in Computational Thermostructural Analysis of Composite Plates and Shells With Strong Nonlinearities." Applied Mechanics Reviews 50, no. 5 (May 1, 1997): 285–306. http://dx.doi.org/10.1115/1.3101708.

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The article presents some modern developments in computational technology for the nonlinear thermostructural analysis of laminated composite plates and shells of arbitrary geometry. Following a review of the current state of the art, it particularly emphasizes on new finite element methodologies that can be applied to the study of complex laminated shells both thermally and structurally using the same topology constructed via simple simplex triangular elements based on respective first-order lamination theories. Very high temperatures are imposed on some examples in order to demonstrate the high effect of nonlinearity. In addition, the authors want to prepare the ground for the advent of new high-temperature materials. For the numerical examples presented comparison with reference solutions is made where available. Thus the present overview intends to impact a continuing discussion on the unification and integration of thermal and structural analyses methods as they apply to large and complex high-temperature composite shell structures under combined thermal and mechanical loading. In this respect it also intends to contribute to the on-going efforts of integrating thermal and structural engineering codes and the development of suitable interfaces. Future research trends are also identified.
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47

Feng, Yunwen, Jiale Zhang, Xiaofeng Xue, Xiaoping Zhong, and Wei Xie. "Structure design and reliability analysis of Al-Ti lugs." Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University 39, no. 1 (February 2021): 1–8. http://dx.doi.org/10.1051/jnwpu/20213910001.

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Aircraft lug joint is the key part of load transfer. In order to improve the safety of lug joint, on the premise of meeting the design requirements of static strength and fatigue, the composite connection lug structure design technology of different metal materials is proposed in this paper. Firstly, the damage safety design and life reliability analysis of the lug structure are studied theoretically. Secondly, based on the concept of damage safety design and the design principle of deformation coordination, the design method of composite connection lug with deformation coordination is proposed, and the thickness ratio of single ear is 0.8:1:0.8. Finally, the reliability of the composite lug is analyzed. The results show that the structural design scheme of aluminum-titanium composite ear piece can meet the requirements of static strength and damage tolerance, and compared with the conventional ear structure, the failure probability of structure mission life is greatly reduced when the weight of the composite connection lug is only increased by 4.9%. The proposed method can effectively guide the structural design of composite ear piece.
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48

Rosen, Aviv. "Structural and Dynamic Behavior of Pretwisted Rods and Beams." Applied Mechanics Reviews 44, no. 12 (December 1, 1991): 483–515. http://dx.doi.org/10.1115/1.3119490.

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Because of being important structural elements in many engineering applications on one hand, and presenting inherent complicated coupling effects on the other hand, pretwisted rods have attracted the interest of many researchers. During the years, as a result of engineering breakthroughs, like the introduction of composite materials or operating at very high temperatures, the problems associated with pretwisted rods became more complicated. The present review will present the research during the last fifty years. It will be divided into three main subjects: static analysis, dynamic analysis and stability problems. The review will concentrate on the structural and dynamic aspects of pretwisted rods. Derivations of models and solution techniques will be addressed.
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Chamis, C. C., and S. N. Singhal. "Coupled Multidisciplinary Simulation of Composite Engine Structures in Propulsion Environment." Journal of Engineering for Gas Turbines and Power 115, no. 2 (April 1, 1993): 300–306. http://dx.doi.org/10.1115/1.2906709.

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A computational simulation procedure is described for the coupled response of multilayered multimaterial composite engine structural components that are subjected to simultaneous multidisciplinary thermal, structural, vibration, and acoustic loading including the effect of hostile environments. The simulation is based on a three-dimensional finite element analysis technique in conjunction with structural mechanics codes and with the acoustic analysis methods. The composite material behavior is assessed at the various composite scales, i.e., the laminate/ply/fiber and matrix constituents, via a nonlinear material characterization model. Sample cases exhibiting nonlinear geometric, material, loading, and environmental behavior of aircraft engine fan blades are presented. Results for deformed shape, vibration frequencies, mode shapes, and acoustic noise emitted from the fan blade are discussed for their coupled effect in hot and humid environments. Results such as acoustic noise for coupled composite-mechanics/heat transfer/structural/vibration/acoustic analyses demonstrate the effectiveness of coupled multidisciplinary computational simulation and the various advantages of composite materials compared to metals.
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50

Talreja, Ramesh. "Physical modelling of failure in composites." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 374, no. 2071 (July 13, 2016): 20150280. http://dx.doi.org/10.1098/rsta.2015.0280.

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Structural integrity of composite materials is governed by failure mechanisms that initiate at the scale of the microstructure. The local stress fields evolve with the progression of the failure mechanisms. Within the full span from initiation to criticality of the failure mechanisms, the governing length scales in a fibre-reinforced composite change from the fibre size to the characteristic fibre-architecture sizes, and eventually to a structural size, depending on the composite configuration and structural geometry as well as the imposed loading environment. Thus, a physical modelling of failure in composites must necessarily be of multi-scale nature, although not always with the same hierarchy for each failure mode. With this background, the paper examines the currently available main composite failure theories to assess their ability to capture the essential features of failure. A case is made for an alternative in the form of physical modelling and its skeleton is constructed based on physical observations and systematic analysis of the basic failure modes and associated stress fields and energy balances. This article is part of the themed issue ‘Multiscale modelling of the structural integrity of composite materials’.
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