Modeling of the mechanical characteristics of chaotically reinforced GRP

Motavkin, A. V.; Kalinka, Yu. A.; Teleshov, V. A.

doi:10.1007/bf00856419

Cited by 2 publications

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“…This is not always a plausible result from the technological standpoint, if only because orientation, frequently nonuniform, may build up to cause buckling of articles [368][369][370].…”

Section: Some Recommended Practices In Processing Highly-filled Compomentioning

confidence: 99%

Filled polymers: Mechanical properties and processability

Enikolopyan

Fridman

Stal'nova

et al. 1990

Filled Polymers I Science and Technology

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In this review the wide spectrum of properties of filled polymer systems is generalized. Classical and modern conceptions dealing with the influence of the boundary layer and filler on melting and crystallization of the polymer matrix. Polymer properties in the melted and condensed state are considered, attention being given to the influence of the filler particle size and shape, the nature of its surface, its structure, and agglomeration on the theological and mechanical characteristics of composites.Data on structure and properties of filled thermoplastic composites are summarized for the first time. Special attention is paid to the peculiarities of composites with modified polymerized filler behavior during rheological and mechanical testing and processing of such composites. IntroductionPolymeric composite materials (PCM) belong to one of the most important classes of structural materials attracting ever growing interest, as manifested by the huge flow of published scientific and technical information dealing with the problems of developing, preparing, processing and using PCM [1]. Whereas the oil and gas fuel crisis has receded recently, the problem of their restrained use still remains an urgent one if only because the oil and gas reserves are not unlimited and practically non-reproducible. Estimates by specialists have shown [2,3] that the development of PCM with a view to cut the consumption of polymeric materials can only be economically feasible if not less than 15% by volume of the filler are added.Waste products from a number of commercial processes can be used as cheap and readily available fillers for PCM. For example, lightweight structural materials may be obtained by filling various low-viscous resins with waste materials [4,5]. Also by adding fillers to reprocessed polymers it is possible to improve their properties considerably and thus return them to service [6]. This method of waste utilization is not only economically feasible but also serves an ecological purpose, since it will help to protect the environment from contamination. The maximum percentage of the filler should in these cases be such as to assure reliable service of the article made from the PCM under specified conditions for a specified period of time.However, the chief purpose of introduction of fillers into PCM is to make possible the modification of polymers and thereby create materials with a prescribed set of physico-mechanical properties, and, obviously, the properties of filled materials may be controlled by, for example, varying the type of the base polymer (the "matrix") and filler, its particle size distribution and shape. It may not require a large quantity of filler [7]. Thanks to considerable advances in PCM research, their use in a broad range of industries -machine building, construction, aerospace technology, etc. -has become extensive [8][9][10][11].Development of an assortment of polymeric composite materials, decSsions concerning their possible scope of applicability and service conditions involve research in...

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“…This is not always a plausible result from the technological standpoint, if only because orientation, frequently nonuniform, may build up to cause buckling of articles [368][369][370].…”

Section: Some Recommended Practices In Processing Highly-filled Compomentioning

confidence: 99%

Filled polymers: Mechanical properties and processability

Enikolopyan

Fridman

Stal'nova

et al. 1990

Filled Polymers I Science and Technology

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Composite‐material mechanics: Properties of planar‐random fiber composites

Bert

Kline

1985

Polymer Composites

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This paper is primarily a literature review of over ten dozen papers on the methodology for predicting elastic stiffnesses, tensile strength, thermal expansion, and thermal conductivity of planar-random fiber composites from the reinforcement geometry and appropriate properties of the constituent materials. Particular attention is devoted to the effects of fiber volume fraction, fiber curvature, fiber length, and fiber orientation, since variations in these properties can be introduced during the manufacturing process. E = 1 Ell(dJ)ddJ (3) Here EI1(c$) is the composite elastic modulus of a Unidirectional composite (of the same fiber volume fraction) as a function of 4, given by -cos2c$ sin2$ + EF1 sin49]-' where E L , ET, GLT, and vLT are the respective longitudinal (L) and transverse (T) elastic moduli, the shear modulus with respect to L, T axes, and the major Poisson's ratio of the unidirectional composite. The work of Nielsen and Chen was extended by Halpin and Pagano ( 5 ) , who presented the following closed-form expressions for all three of the stiffness properties: (5) E = 4(US/U1)(Ul -Us) V = (U, -2Us); c = us POLYMER COMPOSITES, JULY, 1985, Yo/. 6, No. 3 133 F = (2Fs/r)[1 + (FTP~,,) + I~(FTF,,,/F;)]

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Modeling of the mechanical characteristics of chaotically reinforced GRP

Cited by 2 publications

References 1 publication

Filled polymers: Mechanical properties and processability

Filled polymers: Mechanical properties and processability

Composite‐material mechanics: Properties of planar‐random fiber composites

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