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The Effect of Importing Extension-Bending Coupling into Asymmetric Composite Structures Mech. Compos. Mater. (IF 1.007) Pub Date : 2021-01-16 D. Cui, D. Li
The application of asymmetric composite materials in such adaptive structures as fan blades, fixed-wing aircrafts, and tilting rotors can lead to more deformation modes and good mechanical properties still remaining hygrothermally stable. But the influence of the extension-bending coupling effect on their mechanical properties is unknown. The wing skin is taken as an example to obtain a variety of
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Optimization of Pultrusion Processes for an Industrial Application Mech. Compos. Mater. (IF 1.007) Pub Date : 2021-01-15 E. Barkanov, P. Akishin, E. Namsone, J. Auzins, A. Morozovs
Two optimization problems are formulated to improve the effectiveness and productivity of pultrusion processes, to preserve the quality of pultruded profiles, and to take into account the ambient industrial shop temperature and requirements of process technologists. To solve these problems, an optimization methodology using designed computer experiments and the response surface technique was developed
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Numerical Simulation of Progressive Delamination in Composite Laminates Under Mode I and Mode II Loadings Mech. Compos. Mater. (IF 1.007) Pub Date : 2021-01-15 Z. Z. Wang, J. Zhao, X. Ma, S. J. Wang, X. Yang
A progressive interlaminar damage model, based on the Northwestern University theory and a trapezoidal trilinear traction-separation law, is presented to predict the initiation and propagation of delamination in layered composites under Mode I and Mode II loadings. The capability and reliability of the damage model proposed is assessed by comparing its results with experimental data. It was found that
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Destruction of PMMA after the Irradiation with High-Energy Electrons and a Mechanical Point Impact Mech. Compos. Mater. (IF 1.007) Pub Date : 2021-01-15 B. Kozhamkulov, K. Kadyrakunov, K. Jumadillayev, Zh. Primkulova, H. Altenbach
A photo-optical and radiophysical study into the destruction process of the internal structure of plexiglass (PMMA) after its exposure to an ionizing electron irradiation and a subsequent external mechanical point impact was carried out. Enlarged macrophotography of the picture of the radiation-mechanical internal destruction of plexiglass was performed at different shooting modes. An analysis and
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Process-Induced Deformation of L-Shaped Laminates: Analysis of Tool–Part Interaction Mech. Compos. Mater. (IF 1.007) Pub Date : 2021-01-15 Z. Yuan, G. Yang, Z. Yang, Y. Feng, S. Li, Y. Li, X. Tong, D. Song
During the curing process of thermoset composites, residual stresses inevitably develop in them and lead to their curing deformation after the manufacturing process. This work was aimed at investigating the effect of tool–part interaction and bending stiffness on the curing deformation of L-shaped composite structures. Therefore, a twostep calculation model was developed. It consists of a numerical
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Creating a New Elastomeric Material with a Polyimide Filler and Studying its Viscoelastic Properties under Applied External Electric Fields and Dynamic Loads Mech. Compos. Mater. (IF 1.007) Pub Date : 2021-01-15 N. A. Semenov, E. S. Kelbysheva
Electrorheological elastomers (EREs) have viscoelastic properties controllable by external electric fields. For their application, it is necessary to investigate the rheological properties of EREs under various loading conditions. In this work, anisotropic EREs based on a silicone rubber with 10 wt% of PI-Na polyimide particles oriented in an electric field were first obtained. Their elastic properties
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Modelling the Process of Fused Deposition Modelling and the Effect of Temperature on the Mechanical, Roughness, and Porosity Properties of Resulting Composite Products Mech. Compos. Mater. (IF 1.007) Pub Date : 2021-01-15 K. Abouzaid, D. Bassir, S. Guessasma, H. Yue
Advances in the additive manufacturing (AM) processes have opened up the possibilities of widely using them in various structural sectors. Since 1980s this technology has been in permanent mutations. The ramification of the AM technology makes it difficult to obtain a clear impression of its potentialities. Predicting and controlling the mechanical characteristics of printed products is crucial for
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Optimizing the Thickness/Stiffness Distribution of Infinitely Wide Porous FGM Plates Subjected To Supersonic Flutter Constraints Mech. Compos. Mater. (IF 1.007) Pub Date : 2021-01-14 A. Muc
The analytical solutions of supersonic flutter of porous functionally graded plates are investigated. The material properties of the plates (stiffness and density) vary according to a power law across the thickness and axial coordinates depending on the volume fraction of constituent materials. Their equilibrium and stability equations are derived based on the classical plate theory. The solution of
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Numerical Modeling of Large Deformations for Porous Metals and Identification of Carcass Deformation Diagrams Mech. Compos. Mater. (IF 1.007) Pub Date : 2021-01-14 V. G. Bazhenov, М. N. Zhestkov
The static compression of porous aluminum specimens, with free vertical surfaces fixed in a cylindrical holder, was investigated both theoretically and experimentally. Calculation were performed using the principle of 3D similarity of the stress-strain state in structural elements of constructions. Such an approach allows one to take into account the nonuniform distribution of stresses and strains
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Optimal Stochastic Distribution of CNTS in a Cantilever Polymer Microbeam Using Artificial Neural Networks Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-11-23 M. Nahas, M. Alzahrani
The optimal stochastic distribution of carbon nanotubes (CNTs) in nanoreinforced polymer composite of a cantilevered microbeam is investigated. Finite-element simulations of the CNT-reinforced microbeams were conducted to obtain data for training an artificial neural network to construct a surrogate model. This model was then used in an optimization routine to determine the optimal CNT distribution
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Modeling the Nonlinear Deformation and Damage of Carbon-Aramid Fabric Composites in Tension Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-11-20 E. V. Leshkov, S. B. Sapozhnikov
To model the deformation of fabric polymer composite materials highly nonlinear in tension along the warp/weft threads, an analytical approach is proposed. Based on experimental data and the method of a deformable polyhedron, a tool is developed for an efficient selection of parameters for the model of a fabric composite consisting of equivalent orthogonally stacked unidirectional layers. A new version
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Shape Control of Composite Plates with Distributed Piezoelectric Actuators in a Three-Dimensional Formulation Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-11-18 S. V. Plotnikova, G. M. Kulikov
Based on the method of sampling surfaces, a hybrid finite-element model is developed for a three-dimensional analysis of laminated composite plates with piezoelectric patches. According to this method, the sampling surfaces inside the layers and piezoelectric patches parallel to the middle surface are selected, and displacements and electric potentials of these surfaces are introduced as unknown functions
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Panel Flutter of a Variable-Thickness Composite Shell Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-11-18 V. N. Bakulin, M. A. Konopelchev, A. Ya. Nedbai
Systems of equations are obtained to study the onset of panel flutter of a composite shell with a linearly varying thickness. Using a model developed, the critical flow-over speed, corresponding to the onset of flutter, as a function of thickness difference between the left and right ends of the shell is calculated for various values of the axial compressive force and shell length with and without
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An Adaptive Structure Based on Hybrid Extension-Twisting Coupled Laminates Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-11-18 D. Cui, D. K. Li
Based on the classical laminate theory and proceeding from the necessary and sufficient conditions for the hygrothermal stability of materials, interlayer hybrid extension-twisting coupled free-layer laminates are designed. Then, analytical solutions for their yield and buckling strengths are derived. A mathematical model for the optimum design of composite structure is established to realize a synchronous
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Strength Prediction for Composite Plates with an Inclined Elliptical Hole Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-11-18 M. J. Lin, K. H. Tsai, C. L. Hwan
Up to now, the notched strength of a composite laminate containing an inclined elliptical hole at its center has not yet been predicted by researchers due to the absence of an appropriate failure criterion and an analytical solution. In this study, this problem is tackled by using a finite-element-based procedure, developed previously by the authors, together with a modified point stress criterion
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On Temperature-Related Shift Factors and Master Curves in Viscoelastic Constitutive Models for Thermoset Polymers Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-11-17 S. G. Nunes, S. Saseendran, R. Joffe, S. C. Amico, P. Fernberg, J. Varna
Reliable accelerated testing routines involving tests at enhanced temperatures are of paramount importance in developing viscoelastic models for polymers. The theoretical basis, the time-temperature superposition (TTS) principle, is used to construct master curves and temperature-dependent shift factor, which is the necessary information to simulate the material response in arbitrary temperature and
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Mechanical Characterization and Optimum Design of Wound Glass-Fiber-Reinforced Polymer Pipes Based on the Winding Angle and the Number of Plies Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-11-17 B. Baali, A. Benmounah, M. Rokbi
The design of composite structures is always a very delicate task to ensure that an antisymmetrically wound laminate had the performance required. Our study was carried out with the aim to optimize the performance/cost ratio of these materials. It consisted in the design and manufacture of orthotropic filament-wound glassreinforced polyester (GRP) pipes with different fiber orientation (± 45, ± 55
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Effect of Microwave Irradiation on the Microinhomogeneity of α-Relaxation Processes in Polyvinyl Alcohol Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-11-14 V. A. Lomovskoy, N. V. Nekrasova, N. Yu. Lomovskaya, O. A. Khlebnikova, N. A. Abaturova, T. B. Galushko, A. M. Gorbunov
The internal friction spectra λ = f(T) and the temperature dependence ν = f(T) of the frequency of free damping in the temperature range from –150°C to 120°C of microwave-irradiated and nonirradiated samples of polyvinyl alcohol were obtained. A theoretical analysis of nature of the peak located on the ascending branch of the α-peak of relaxation losses on the internal friction spectrum is carried
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Prediction of the Bending Strength of a Laminated Veneer Lumber (LVL) Using an Artificial Neural Network Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-11-14 M. Nazerian, S. A. Razavi, A. Partovinia, E. Vatankhah, Z. Razmpour
The application of an artificial neural networks (ANN) to predicting the bending strength of a laminated veneer lumber (LVL) manufactured under different conditions is considered. First, experimental studies were conducted, and then an ANN model was developed based on the experimental data obtained. LVL specimens of walnut wood, glued with urea-formaldehyde resins containing a chemically modified starch
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Experimental Investigation into the Fatigue Damage Performance of a GRP Mortar Pipe Culvert Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-11-14 H. Shi, X. Han
The fatigue damage evolution in glass-fiber-reinforced (GRP) mortar pipes under cyclic loading were investigated. Based on the results of fatigue tests, a two-stage linear law of stiffness degradation of a glass-fiber-reinforced plastic mortar pipe culvert is proposed, and a model for calculating its stiffness degradation is established. By proposing a reasonable residual stiffness calculating equation
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Critical Analysis of the Equations of Statics in the Bending Theories of Composite Plates Obtained on the Basis of Variational Principles of Elasticity Theory 2. Particular Low-Order Theories Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-09-22 A. P. Yankovskii
In a geometrically linear formulation based on the use of variation principles of elasticity theory, the twodimensional equations of statics and the boundary conditions at the edge of an orthotropic bending plate are obtained within the framework of the classical theory and two low-order nonclassical theories: Reddy–Nemirovskii and Margueere–Timoshenko–Naghdi ones. It is shown that using the hypotheses
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Advances of the Shear Deformation Theory for Analyzing the Dynamics of Laminated Composite Plates: An Overview Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-09-22 S. P. Parida, P. Ch. Jena
An attempt has been made to perform a comparative study on advances in the shear deformation theory for analyzing the statics and dynamics of different plates with the use of numerical examples. Initially, shape functions for the displacement field across the plate thickness are compared, and then, the stresses, deflections, and natural frequencies of laminated composite plates are also compared.
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The Influence of Imperfect Contact Conditions between Layers of a Hollow Sandwich Sphere on its Natural Frequencies Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-09-17 Y. M. Sevdimaliyev, S. D. Akbarov, N. Yahnioglu
The influence of imperfect contact conditions between layers of a hollow sandwich sphere on its natural frequencies is studied. It is assumed that the materials of face layers are the same, but different from the core layer material. Each layer is made of a homogeneous isotropic material and has a constant thickness. Investigations are performed using a piecewise homogeneous body model with the use
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Free Vibration of Grid-Stiffened Composite Cylindrical Shell Reinforced with Carbon Nanotubes Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-09-17 R. Azarafza, Al. Davar, M. S. Fayez, J. E. Jam
A linear free vibration analysis is presented for computing the natural frequencies of a grid-stiffened carbon-nanotube-reinforced composite cylindrical shell. The carbon nanotubes (CNTs) are supposed to be oriented unidirectionally across the shell thickness, and the elastic moduli of the CNT-reinforced polymer composite are calculated using a modified rule of mixtures. In order to obtain the equivalent
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Stochastic Perturbation-Based Finite Element for Free Vibration of Functionally Graded Beams with an Uncertain Elastic Modulus Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-09-16 N. V. Thuan, T. D. Hien
The stochastic eigenvalue problem for free vibrations of functionally graded beams with a random elastic modulus is investigated. The effective material properties and beam cross section are assumed to vary continuously in different directions according to the exponential law. The governing equations for the natural frequency of the functionally graded beams are derived from Hamilton’s principle. In
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Features of Inelastic Behavior of a Composite Under Cyclic Loading. Experimental and Theoretical Investigations Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-09-15 V. N. Paimushin, R. A. Kayumov, S. A. Kholmogorov
For a carbon-fiber-reinforced plastic made of an ELUR-P unidirectional tape and an ХТ-118 cold-cure binder, specimens with a ±45° stacking sequence were tested for cyclic tension. The total axial strain was considered as the sum of nonlinearly elastic, viscoelastic, and irreversible creep strains. Using the Abel creep kernel, it was found that, at instants of time shifted by values multiples of the
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A Methodology for Estimating the Delamination Growth Rate in Layered Composites under Tensile Cyclic Loading Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-09-10 V. E. Strizhius
The main features of physical modeling of the delamination growth rate in layered composites in tensile loading are considered. To estimate this rate, an equation in the form of the well-known Collipriest equation, which is widely used in estimating the crack growth rate in metal materials, is proposed. The values of empirical constants of the equation for a quasi-isotropic [45/90/-45/0]S XAS/914 carbon/epoxy
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Numerical and Experimental Analyses of the Hoop Tensile Strength of Filament-Wound Composite Tubes Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-09-10 R. Rafiee, F. Abbasi
The hoop tensile strength of a composite pipe was measured experimentally using the split-disk test method. Then, a finite-element modeling was performed to simulate the split-disk test, and the progressive damage modeling was carried out to predict the maximum load the ring specimen representing the hoop tensile strength can carry. The progressive damage modeling was utilized in the context of continuum
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Functionally Deterministic Model of Hydroerosion in Studying the Physically Latent Ability of a Composite Material to Defect Formation Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-09-09 A. A. Barzov, S. V. Bochkarev, A. L. Galinovskii
A method for the ultrajet diagnostics of products made of composite materials is presented. It makes it possible to simulate, in an accelerated regime, the fatigue tests of materials and to estimate the adhesion strength of the fiber-filler bond under alternating loads. A hydroerosion model of the diagnosed surface under the operation of sequentially conjugate ultrajet actions by various working hydraulic
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The Effect of Single-Walled Carbon Nanotube (SWCNT) Concentration on the Mechanical and Rheological Behavior of Epoxy Matrix Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-09-09 Z. Ay, M. Tanoğlu
The improvement of Mode I fracture toughness of epoxy by the addition of single-walled carbon nanotubes (SWCNTs) is considered. To prepare nanocomposites, chemical-vapor-deposition-grown SWCNTs noncovalently functionalized with an ethoxylated alcohol was used as the additive and a diglycidyl ether of bisphenol-A-based epoxy as the matrix material. The SWCNTs were dispersed in the epoxy matrix via a
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Yield Loci of Reinforced Plates Made from Rigid-Plastic Unequiresistant Materials Considering the Two-Dimensional Stress State in Fibers II. Orthogonal Reinforcement 1 Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-07-28 T. P. Romanova; A. P. Yankovskii
Structural models of hybrid fiber composites orthogonally reinforced in the plane are constructed. They allow one to calculate the yield loci taking into account the plane stress state in all composition components with different tensile and compressive yield stresses. Materials of the components are homogeneous and isotropic, and their mechanical behavior is described by the associated flow rule for
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Experimental Investigation into the Mechanical Behavior of Textile Composites with Various Fiber Reinforcement Architectures Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-07-17 V. Khatkar; A. G. Sakthi Vijayalakshmi; R. N. Manjunath; S. Olhan; B. K. Behera
The role of fiber reinforcement architecture in adjusting the mechanical properties of glass-fiber-reinforced epoxy composite materials is studied. Fibrous E-glass unidirectional (UD) and 3-dimensional (3D) samples with an identical fiber volume fraction were prepared. The UD composites displayed excellent properties along the fiber direction, but the 3D ones showed excellent properties in all three
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Experimental and Numerical Study of the Static Performance of a Hoop-Wrapped CNG Composite Cylinder Considering Its Variable Wall Thickness and Polymer Liner Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-07-16 M. Nouri; F. Ashenai-Ghasemi; G. Rahimi-Sherbaf; K. Reza Kashyzadeh
The static performance of a composite type 4 CNG cylinder was investigated using a finite-element simulation and experimental validation. This cylinder involved a liner hoop wrapped with a fiber impregnated by a suitable resin. Tensile tests were performed on standard specimens to examine the mechanical properties of the composite material. Next, a finite-element simulation was performed to determine
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Critical Analysis of the Equations of Statics in the Bending Theories of Composite Plates Obtained on the Basis of Variational Principles of Elasticity Theory 1. General Theories of High Order Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-07-16 A. P. Yankovskii
In a geometrically linear formulation based on the use of variational principles of elasticity theory and the generalized Galerkin method, three approaches to constructing equations of static bending of orthotropic plates with a constant thickness are considered. The displacements of plate points are approximated by polynomials in the transverse coordinate with unknown coefficients of expansion. The
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Damage Behavior of Hybrid Composite Plates Exposed to Impacts at Different Energy Levels Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-07-14 T. Özben; H. Şen
The impact behavior of hybrid composite plates cured at 120°C were examined by dropping weights on them for three hours. Two groups of hybrid composite plates were considered. In the first group (TYPE1), all plies were staked symmetrically or antisymmetrically with orientation angle 0°, but in the second group (TYPE2), plies were staked symmetrically or antisymmetrically with orientation angles 0°
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Influence of Aluminum Oxide Nanoparticles on Formation of the Structure and Mechanical Properties of Microfibrillar Composites Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-07-14 V. P. Plavan; V. G. Rezanova; Yu. O. Budash; O. V. Ishchenko; N. M. Rezanova
The effect of nanosize alumina (Al2O3) concentration on the morphology and mechanical properties of microfibrillar composites obtained by processing the thermodynamically incompatible polypropylene/ copolyamide (PP/CPA) blend was studied. It was established that composite monofilaments exhibited a selfreinforcing effect due to the in situ formation of PP fibrils (microfibers) in the CPA matrix. The
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Energy Absorption of Carbon-Fiber-Reinforced Composite Laminates Under Low-Velocity Impacts Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-07-14 H. Sun; F. Li; K. Shen; K. Li
Drop-weight tests were conducted to investigate the impact responses of carbon-fiber-reinforced composite laminates under low-velocity impacts. A finite-element model is proposed to describe the failure during impacts. The impact damage behavior of composite laminates with different thicknesses were simulated to analyze their energy absorption ability, and a method for its prediction is presented.
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Mechanical Properties of a Basalt-Fiber-Reinforced Plastic Rod Used in Composite High-Voltage Wires in Torsion and Three-Point Bending Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-07-14 S. V. Slovikov; D. S. Lobanov
Results of experimental investigations into a unidirectional composite of basalt fibers and epoxy resin used as part of high-voltage electric wires are presented. Tensile tests of BFRP specimens previously held wrapped around a transportation drum during 10 h were carried out. The influence of the keeping time of the BFRP core in the composition of a high-voltage electric wire on drums of diameter
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Local Delaminations Induced by Interaction Between Intralaminar Cracking and Specimen Edge in Quasi-Isotropic CF/EP NCF Composites in Fatigue Loadings Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-07-14 H. B. Kahla; Z. Ayadi; J. Varna
Experimental results are presented on the onset and propagation of local delaminations caused by the interaction between specimen edges and intralaminar cracks in fiber bundles of 90° layers in quasi-isotropic [–45/90/45/0]s CF/EP noncrimp fabric (NCF) laminates subjected to tension-tension fatigue loadings. It is confirmed that the first damage mode is intralaminar cracking in 90° layers, which consists
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Influence of High-Frequency Radiation on the Deformation Behavior of Composites Based on Low-Molecular Rubbers Filled with Silicon Dioxide Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-07-14 E. M. Nurullaev
For the first time, the influence of microwave radiation on the structure of a three-dimensionally cross-linked, plasticized, filled polymer composite material based on low-molecular rubbers — a polydivinyl epoxyurethane rubber of grade PDI-3B and a divinyl rubber of brand SKD-KTR — was investigated. It is shown that variations in the mechanical characteristics of the composite material during irradiation
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Material Properties of Basalt-Fiber-Reinforced Gypsum-Based Composites Made with Metakaolin and Silica Sand Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-07-14 S. A. Yildizel
The effects of metakaolin (MK) and basalt fiber (BF) on the performance of gypsum-based composites were investigated. BFs 6 and 12 mm long were used in concentrations of up to 0.8 wt.%. Mechanical tests were conducted on both dry and water-saturated specimens. It was found that their flexural and compressive strengths increased with content of BFs to 0.6%. However, the mechanical and durability properties
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Ecowood Composites Made using Citric-Acidmodified Corn and Oil Palm Starches as the Binder Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-07-14 M. H. M. Amini; R. Hashim; N. S. Sulaiman; M. Mohamed; M. B. A. Bakar
The conventional wood-based composites contain an unreacted free formaldehyde, which causes a cancerous effect on humans. To overcome this problem, citric-acid-modified corn and oil palm starches are proposed as ecobinders for wood-based composites in this study. Experimental rubber-wood panels were made using the ecobinders. The panels were subjected to FT-IR, TGA, DSC, and X-ray diffraction analyses
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Numerical Modeling of Resonant Vibrations of an Elongate Plate with an Integral Damping Coating Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-05-26 V. N. Paimushin; V. A. Firsov; V. M. Shishkin
The classical methods of surface damping of bending vibrations of thin-walled structures and a promising integrated version with a damping coating consisting of two layers of a material with pronounced viscoelastic properties and an intermediate thin reinforcing layer of a high-modulus material are discussed. A four-layer finite element for an elongate plate with an integral damping coating is developed
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Determining the Tensile Properties and Dispersion Characterization of CNTs in Epoxy Using Tem and Raman Spectroscopy Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-05-25 M. Bourchak; K. A. Juhany; N. Salah; R. Ajaj; A. Algarni; F. Scarpa
In this work, transmission electron microscopy (TEM) and Raman spectroscopy were used to assess the dispersion quality of carbon nanotubes (CNTs) in an epoxy matrix. Its ultimate tensile strength (UTS), engineering strain, local strain, and the elastic tensile modulus were determined experimentally. The effect of CNT sonication time in an ethanol medium was also evaluated. A statistical analysis using
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Method for Calculating the Near-Surface Effect in Piecewise Homogeneous Bodies at Large Deformations Based on a Two-Level Approach Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-05-22 V. M. Akhundov
A method is proposed for calculating the near-surface effect in piecewise homogeneous bodies under large deformations based on a combined use of one-level applied and two-level carcass theories. The applied theory is used for a macromechanical continuation of the solution of the problem, but the carcass theory is used in the final part of the loading path or directly at the final loading of the body
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Real-Time Characterization of Pultrusion Processes with a Temperature Control Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-05-20 E. Barkanov; P. Akishin; E. Namsone; A. Bondarchuk; N. Pantelelis
For the real time characterization of pultrusion processes with a complex temperature control, two finite-element modeling approaches utilizing a continuous model with lumped material properties for a cured composite have been developed. The first procedure, based on the mixed time integration scheme and the nodal control volumes method, is working in the ANSYS Mechanical environment, but the second
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A Progressive FE Failure Model for Laminates under Biaxial Loading Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-05-20 H. Zhu; Z. X. Guo; M. Zhu; J. J. Cui; Q. He; Y. C. Li
A finite-element (FE) model simulating the elastic behavior of anisotropic glass/epoxy composite laminates subjected to a biaxial tensile loading is proposed. A progressive failure prediction and analysis are performed in the ABAQUS FE code by using user-defined constitutive equations. A numerical analysis is performed for different loading ratios and ply angles. Gradual failure patterns of fiber and
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Determinating the Volume Content of a Polymeric Matrix in CFRP Structures Using a Laser-Ultrasonic Method Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-05-20 Yu. G. Sokolovskaya; A. N. Zharinov; A. A. Karabutov; N. B. Podymova
An acoustic method for a quantitative assessment of the volume content of a polymeric matrix in CFRPs is proposed and realized experimentally. For this purpose, a laser-ultrasonic method based on the thermo-optical excitation of broadband pulses of longitudinal acoustic waves is used. A formula for calculating the volume content of the polymeric matrix in a CFRP from experimentally measured phase velocities
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Failure of Polymer Beams Reinforced with Glass Fibers Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-05-19 L. Czechowski; J. Gralewski; T. Kubiak
The present paper deals with the four-point bending of polyvinyl chloride beams reinforced with glass fiber clusters. The clusters, treated as orthotropic materials, were arranged periodically along the longitudinal axis of beams. The load-carrying capacity of the beams was estimated by two methods. In the first method, the beam strength was assessed using the Max-Stress, Max-Strain, Tsai–Wu, Inverse
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Investigating the Effect of Chewing Force and an Abrasive Medium on the Wear Resistance of Composite Materials by Chewing Simulation Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-05-19 E. Yilmaz
Various composite materials used as biomaterials were tested by 20-, 50-, and 80-N chewing forces in distilled water and a poppy seed medium by using a computer-controlled chewing simulation procedure. In each chewing test, steatite balls 6 mm in diameter were used as an antagonist material. The mean volume loss of worn surfaces and the surface roughness of the composite materials was measured with
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Comparison of Glass-Transition Temperatures for Epoxy Polymers Obtained by Methods of Thermal Analysis Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-05-18 O. V. Startsev; Yu. M. Vapirov; M. P. Lebedev; A. K. Kychkin
In this review, the characteristic temperatures for epoxy polymers and epoxy matrices of fiber-reinforced composites in the glass-transition ( α-transition) range determined using different methods of thermal analysis (DSC, DMA, and TMA) are compared. The influence of loading frequency in the DMA method and of uniformity of heating and postcuring of specimens in all the methods is revealed. The agreement
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Influence of the Thickness of a Polymer Shell Applied to Surfaces of Submicron Filler Particles on the Properties of Polymer Compositions Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-05-18 A. A. Akhmadeev; E. A. Bogoslov; M. P. Danilaev; M. A. Klabukov; V. A. Kuklin
The results of studies into the influence of the thickness of a polystyrene shell applied to surfaces of dispersed corundum (Al2O3) filler particles on the structure and mechanical properties of the composition of an acrylonitrile butadiene styrene plastic are presented. It is shown that the mechanical properties of the composition depend at least on two factors: the interaction between shell molecules
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Structurally and Surface-Modified Alumina Particles as a Reinforcement in Polyester-Based Composites with an Improved Toughness Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-05-18 A. Drah; N. Z. Tomić; T. Kovačević; V. Djokić; M. Tomić; R. J. Heinemann; A. Marinković
Commercial γ − Al2O3 particles, Al2O3 n, and synthesized Al2O3 doped with iron oxide (Al2O3 Fe) were used as reinforcements to enhance the toughness of an unsaturated polyester resin (UPR). Alumina modification with vinyl, Al2O3 (n, Fe)–VT, and methacryloyl, Al2O3 (n, Fe)–ME functionalities contributed to the increase in the extent of covalent binding at the UPR/filler interface. Tensile tests showed
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Exact Solution of the Problem on Elastic Bending of the Segment of a Narrow Multilayer Beam by an Arbitrary Normal Load Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-03-19 S. B. Koval’chuk
An exact analytical solution of the problem on plane elastic bending of the segment of a narrow multilayer beam under the action of arbitrary normal loads distributed over its longitudinal faces is presented. It is assumed that the beam deforms elastically, its layers are made of orthotropic materials homogeneous or continuously heterogeneous across the thickness of layers, which are rigidly connected
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Lateral-Torsional Stability Analysis of a Simply Supported Axially Functionally Graded Beam with a Tapered I-Section Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-03-14 M. Soltani; B. Asgarian
A lateral buckling analysis of simply supported web- and/or flange-tapered I-beams made of axially functionally graded materials and subjected to a uniformly distributed load is performed. The properties of beam material vary continuously along the beam axis, depending on the volume fraction of constituent materials, according to an exponential or power law. Considering the coupling between the lateral
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Numerical Modeling of Plastic Deformation of Unidirectionally Reinforced Composites Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-03-12 G. I. L’vov; O. A. Kostromitskaya
A technique for the numerical homogenization of plastic deformation of unidirectionally reinforced composites is developed. A modification of Prandtl–Reuss theory that takes into account the influence of the first invariant of stress tensor is used as governing relations for an equivalent orthotropic material. The isotropic hardening is described by a function depending on the work of plastic deformation
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Effect of the Ratio of Components in a Polyvinyl Alcohol-Chitosan Composite on the Temperature Range of its Inelasticity Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-03-12 V. A. Lomovskoy; N. A. Abaturova; N. Yu. Lomovskaya; T. B. Galushko
The internal friction spectra λ = f (T) were obtained experimentally and the frequency of the free damped vibrational process v = f (T) was determined for an excited polyvinyl alcohol-chitosan system on the temperature interval of –150-250°C. Theoretically analyzed is the possibility of using the Maxwell function to describe the local dissipative processes observable on different temperature ranges
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Influence of Air Cooling on the Fatigue of a Polymer Composite Under Self-Heating Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-03-10 A. Katunin; D. Wachla
The self-heating effect occurs during cyclic loadings or vibrations of composite elements, which may significantly intensify their structural degradation due to a rapid temperature increase. For minimizing this influence, the air cooling can be used. In this study, the influence of air cooling on the fatigue and residual life of a cyclically loaded structure was investigated by analyzing the self-heating
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Models of Nonlinear Fatigue Damage Accumulation Under Cyclic Block Loadings of Layered Composites Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-03-10 V. Strizhius
Considered are two types of multistage cyclic block loading rather common in the practice of fatigue tests and fatigue life predictions for layered polymer composite materials: block loading by four-stage cyclic regular zero-tension loads and block loading by multistage (8-10 levels) asymmetric cyclic loads. In order to improve the prediction accuracy for the fatigue life of carbon-fiber-reinforced
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Low-Velocity Impact Tests on Basalt Fiber/Polypropylene Core Honeycomb Sandwich Composites Mech. Compos. Mater. (IF 1.007) Pub Date : 2020-03-10 M. Bulut
The low-velocity impact behavior of polypropylene- core-based sandwich composites reinforced with basalt/epoxy facesheets was investigated by drop-weight impact tests. The impact resistance of composite samples was characterized for various impact energies according to ASTM standards. Also, the effect of facesheet thickness was explored, and the failure and fracture surfaces around the impacted region
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