On damping properties whiskered layer of modified fibre composites


DOI: 10.34759/trd-2020-114-03

Аuthors

Kriven G. I.*, Makovskii . V.**

Moscow Aviation Institute (National Research University), 4, Volokolamskoe shosse, Moscow, А-80, GSP-3, 125993, Russia

*e-mail: Kriven_Galina@inbox.ru
**e-mail: Makovsky93@mail.ru

Abstract

In this work, for the first time, the effective dynamic properties of a whiskerized layer in modified composites are studied taking into account the structural characteristics of the interphase layer – the length of whiskers, the volumetric content of whiskers, and their mechanical properties. In the case of pure shear along the whiskers, the effective dynamic properties of the interphase layer obtained by the three-phase method and the Reuss method are estimated. In the calculation, we use two types of interfacial matrix: epoxy and viscoelastic polymer at temperatures below the glass transition temperature. Comparison of the obtained plots indicates the effect of a significant increase (by about an order of magnitude) of the effective loss modulus of the whiskerized layer if a viscoelastic polymer is used at a temperature below the glass transition temperature instead of an epoxy matrix. We will also show that an increase in the stiffness of whiskers has a positive effect on the effective characteristics of the interfacial layer, however, we note that this effect manifests itself only at very low volume fractions of the binder in the layer, in the rest of the range the effect is not so pronounced. high effective dissipative properties are realized, which opens up prospects for modeling and predicting modified fiber composites with abnormally high damping properties at the same time sufficiently high mechanical characteristics.

Note that the use of a more accurate procedure for calculating the effective properties, based on the three-phase method, gives somewhat large values ​​for the effective characteristics of the loss modulus, but does not fundamentally change the dependence for the loss modulus. It is important to note that the proposed new procedure for modifying a fiber composite leads to a significant increase in the effective loss modulus, when the effective loss modulus can be significantly increased in comparison with modified composites obtained on the basis of only an epoxy matrix and even in comparison with the loss modulus of the epoxy matrix itself (more than 40 times compared to the loss modulus of an epoxy matrix). At the same time, we note that the effective mechanical properties change insignificantly, and all the useful characteristics and features of the modified fiber composites remain invariably high.

Keywords:

whiskers, fiber composites, viscoelastic binder, micromechanics, effective loss modulus, damping properties

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