Models in the Engineering Mechanics of Polymer-Matrix Composite Systems

Tomashevskii, V. T.; Yakovlev, V. S.

doi:10.1023/b:inam.0000041391.28104.b7

Cited by 10 publications

(5 citation statements)

References 13 publications

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“…This feature made it possible to invite authors from new areas of mechanics and, thus, to familiarize the scientific community with the status of research in the nanomechanics of composites [22,23], the micromechanics of composites [12,16,32], computational mechanics [1,30], the mechanics of coupled fields [10,15,26,28], fracture mechanics [2,11,25], dynamics of bodies interacting with fluid [24,27], wave dynamics [4,6,17,18,29], stability of mechanical systems [8], dynamics of complex systems [7,9], modern experimental methods in mechanics [5,13,14,19,31], and other fields.…”

Section: Essential Science Indicatorsmentioning

confidence: 99%

On a Modern Philosophy of Evaluating Scientific Publications

2005

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Section: Essential Science Indicatorsmentioning

confidence: 99%

On a Modern Philosophy of Evaluating Scientific Publications

2005

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“…That is, the binder is not removed from the moulded material, but it only fills the voids in the PCM. In most cases, this nature of the flow leads to the uneven distribution of the binder in the moulded material, with the observed increase in the binder content in the edge zone [43,44].…”

Section: Introductionmentioning

confidence: 99%

Determination of the Composite Panel Moulding Pressure Value

et al. 2022

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Currently, prefabricated panel structures are typical products made of polymeric composite materials. The integrity of the composite panels, their structure and accuracy of making a contour are largely associated with the manifestation of residual technological stresses. The above phenomena and associated stress-strain behaviour inevitably occur in the process of moulding of the composite products. However, their value, nature, time of occurrence and dynamics of growth can be fully controlled and regulated. The paper deals with the study of the effect of moulding pressure on the quality of a composite product. A dependence is presented that allows us to determine the time for the degassing of the polymeric composite material package at the given temperature and pressure to obtain a monolithic and nonporous structure. It is shown that the peak of the maximum volatile-matter yield for the considered binder types lies in the temperature range where the degree of curing does not exceed 10%; that is, the viscosity values do not prevent the removal of volatile fractions. The effect of moulding pressure on the values of the volume content of the reinforcing material has been studied, and the dependence of the required thickness of the absorbent layer on the parameters of the package of polymer composite material and pressure has been obtained. The dependence of the required thickness of absorbent layer on the parameters of the package of polymeric composite material and pressure has been obtained. The mathematical model developed by us provides an opportunity to predict the stress-strain behaviour of a composite structure at any time during the moulding process. The model is closely related to chemo-viscous and thermal models. It allowed us to synthetize a method for choosing the rational parameters of the moulding process (temperature, pressure, and time), materials of additional layers and equipment. The experiments proved the presence of several defects, such as de-lamination of edges, waviness, swelling and poor adhesion of upper layers in the specimen of the composite panel cooled stepwise in the absence of the vacuum pressure. The surface quality of the specimen of the panel cooled stepwise under vacuum pressure was significantly better, and no visible defects were observed. The obtained theoretical values of deflections, considering the change in physic-mechanical characteristics that depend on the temperature and rheonomic properties of the material, showed an error that did not exceed 7%, compared to the experimental data. Our results can be applied at the enterprises engaged in designing and manufacturing panel structures of polymeric composite materials.

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“…Introduction. Fibers in unidirectional fibrous composites may be curved for design purposes or by various factors during technological process [3,10,15]. According to a large number of theoretical and experimental investigations described in [3-5, 10, 15], the curving may lead to separation of fibers from the matrix under uniaxial tension or compression along the fibers.…”

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“…For this purpose, we represent expressions (15) and (16) in the kth ( , , , , ,... , k = −∞, ,− − +∞ K 2 1 0 1 2 ) cylindrical coordinate system. In this case, we use the summation theorem for the K x n ( ) function, which can be written as …”

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Stress distribution in a composite materialwith a row of antiphase periodically curved fibers

2006

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The stress distribution in an infinite matrix containing a row of antiphase periodically curved fibers is studied using the piecewise-homogeneous body model and the exact three-dimensional equations of elasticity theory for anisotropic bodies. It is assumed that the midlines of the fibers are located in the same plane and the materials of the fibers are the same. Numerical results are presented for the case where the materials of the fibers and matrix are isotropic and homogeneous Keywords: unidirectional fibrous composite, row of fibers, self-balanced stresses, curved fibers 1. Introduction. Fibers in unidirectional fibrous composites may be curved for design purposes or by various factors during technological process [3,10,15]. According to a large number of theoretical and experimental investigations described in [3-5, 10, 15], the curving may lead to separation of fibers from the matrix under uniaxial tension or compression along the fibers. This separation gives rise to macrocracks, which when accumulate may change significantly the stiffness and strength properties of composites [12]. Therefore, theoretical investigations of self-balanced stresses due to fiber curving are of great theoretical and practical significance. To investigate associated problems, a method was developed in [1] based on a piecewise-homogeneous body model and the three-dimensional linear theory of elasticity, and corresponding numerical results were analyzed in [2]. In [6,7,14], this method was extended to the case of two neighboring fibers in an infinite elastic matrix, and numerical results were analyzed. The latter model allows one to obtain some information on the interaction of curved fibers in determining the self-balanced stresses. However, in fact, the inquiry into the interaction of such fibers requires a more complicated model. Therefore, in [8], the approach of [6,7,14] was extended to a periodically located row of fibers in an infinite matrix, and corresponding numerical results were presented. Note that it was assumed in [8] that the fibers curve in phase relative to one another. An analysis of sections of various composites shows that neighboring fibers may also curve in antiphase relative to each other. In this connection, here the results of [8] are extended to an antiphase-curved row of fibers in an infinite matrix. The corresponding instability problems were studied in [9, 10].2. Problem Formulation. Let us formulate a mathematical problem. We associate Cartesian O x x x

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Models in the Engineering Mechanics of Polymer-Matrix Composite Systems

Cited by 10 publications

References 13 publications

On a Modern Philosophy of Evaluating Scientific Publications

On a Modern Philosophy of Evaluating Scientific Publications

Determination of the Composite Panel Moulding Pressure Value

Stress distribution in a composite materialwith a row of antiphase periodically curved fibers

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