Simulation of ultimate strength characteristics of the woven composites on the polymeric binder with dispersed antifrictional additives
UDC
539.3 : 621.891; 678.5Abstract
The composites on the polymeric binder with dispersed polytetrafluorethylene and graphite additives, reinforced with fiberglass of E-glass, are considered. The epoxy resins ED-20, EHD and UP-610 are used as a matrix. Numerical simulation is carried out and the relations of limit values of strength characteristics of specified composites on the concentration of fillers (in compressing in the perpendicular direction to grain fiberglass) are investigated. The original method of prediction of strength properties of matrix composites is used in simulation, by which the enclosed to composite compressive unidirectional load becomes destructive only in case, when matrix internal stress exceeds the matrix strength limit. The specified method is based on generalized singular approximation of random fields' theory and information about matrix strength properties. The simulation basis is based on the operator of stresses concentration (tensor of the fourth rank), which connects local (internal) values of stresses tensor with average (external) on material stresses. The simulation found that the increase in the percentage of fiberglass leads to a significant improvement in strength characteristics of composites, dependency is monotonous and non-linear. It has been shown that the increase of graphite concentration leads to intensification, and the increase in the percentage of polytetrafluorethylene, on the contrary, leads to a weakening of the strength characteristics of the model composites, which then changed in the law, close to linear. It is found that the model composites with graphite as antifrictional filler have greater strength than similar materials in which the polytetrafluorethylene is used as antifrictional component (regardless of the type of polymeric binder).
Keywords:
simulation, matrix composites, operator of stresses concentration, mechanical strength, antifrictional materials, inclusions, epoxy matrixAcknowledgement
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Copyright (c) 2016 Bardushkin V.V., Sychev A.P., Kirillov D.A., Sorokin A.I.
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