Studies of Microwave Electromagnetic Field Influence on Adhesion Strength of the “Matrix-Fiber” Contact Zone on the Example of the Elementary Cell of a Certified Polymeric Composite Material

Abstract:

The strength characteristics of polymer composites (PCM) reinforced with fibers of various nature largely depend on the adhesion strength of the components in the matrix-fiber contact zone, determined by the mechanisms of their adhesive interaction. The strength of the bonds in the contact zone depends on the transfer of the load from fiber to fiber through the matrix layer. Taking into account the order and greater strength of the reinforcing fibers in tension, compared with the matrix material, the adhesion of the PCM components has the greatest effect when the material is perceived as transverse to the direction of the fiber loads, which usually occurs in bending and interlayer shear. In the latter case, the strength of the material several times less, which determines the importance of increasing the strength of the adhesive interaction, which requires comprehensive studies and an adequate description of its mechanisms. An experimental study of the adhesion strength in the matrix-fiber contact zone after short-term exposure to a microwave electromagnetic field with different energy flux densities on the PCM physical cell model, represented as a basalt fiber bundle placed in ED-20 epoxy resin, was performed. It has been established that exposure to a microwave electromagnetic field with an energy flux density of (17-18) x10⁴ μW/cm² for 1-2 minutes leads to an increase in adhesion relative to the source material by no less than 32%. This method can be used as a basis for the development of technologies for increasing the strength of the interlayer shear PCM, reinforced by fibers of various nature. To clarify the mechanisms of the obtained results, it is advisable to conduct a study of the micro-and nanostructures of the “matrix-fiber” contact zone using electron and atomic-force microscopy and its phase composition..

• Periodical: Materials Science Forum (Volume 992)
• Pages: 317-324
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.992.317
• Online since: May 2020
• Authors: Irina V. Zlobina*, N.V. Bekrenev, G. Muldasheva
• Keywords: Adhesive Strength, Contact Zone, Matrix, Microwave Electromagnetic Field, Polymer Composite Materials, Reinforcing Fiber, Unit Cell

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