Experimental study of nano-additives effect on properties of composite materials with interlayer defects

Аuthors

Pokrovskii A. M.^*, Chermoshentseva A. S.^**

Bauman Moscow State Technical University, MSTU, 5, bldg. 1, 2-nd Baumanskaya str., Moscow, 105005, Russia

*e-mail: ampokr@mail.ru
**e-mail: asch-13@ya.ru

Abstract

The subject of researh in the presented paper are interlayer deffects in composite materials (CM), prevention of the rate of their occurrence by strengthening the compoistes with nano-sized powder. It contributes to safety increase while aircraft operatioin and allows prevent emergency situations duting flights.

The goal of the studies consists in developing methods for manufacturing techmology of samples made of epoxy resin reinforcement of laminated CMs with interlayer defects and nano-dispersed powder, by adding nano-particles to the binder, and obtain maximum degrees of CM filling with nano-sized powder.

In the process of performing this work the experimental samples were produced, and the series of tests were conducted. It is noted that occurrence of interlayer defects contributes to lifespan reductiono of a product made of composite materials. The analysis was performed, thereby, on determining the character of a delamination type defects growth.

The properties such as mechanical characteristics anisotropy and the possibility of hidden defects presence in the form of material discontinuity over the separation surface are intrinsic specific properties of composite materials. The paper presents the experimental results of the study how degree of filling of the ED-22 resin by nano-sized silicon dioxide powder (“Taroksil” T-20) of various concentration affects the mechanical properties of a heterogene material. A brief description of production process technology of samples, made of epoxy resin and nano-disperced powder, is presented. The above said studies are used for solving the problem of interlayer defects hardening in laminated composiste materials, which occurrence is a consequence of the aircraft parts production technology imperfection and effect of operational loads of aircraft, by adding the nanoparticles to the binder. The optimal degrees of CMs filling by nano-sized dioxide silicon powder in dependence of mass concentrarion were found. The testing results of the samples made of CM with embedded interlayer defects with adding nano-dispersed additives with various volume concentration from 0.1% to 0.5% to the binder are presented.

These tests tresults' data would be offered for implementation by the enterprises of Holding JSC “Helicopters of Russia”. The work is prospective for further consideration and implementation in the future research activities.

Keywords:

composite material, nano-size powder, defect, experiment, strength

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