Effect of gaps and overlaps when laying prepregs on the mechanical properties of carbon plastics (review)

Timoshkov P.N., Goncharov V.A., Usacheva M.N., Khrulkov A.V.
UDC
678.747.2
DOI
10.18577/2307-6046-2018-0-12-71-78
Article PDF (Russian) (678.96 KB)
How to cite
Timoshkov P.N., Goncharov V.A., Usacheva M.N., Khrulkov A.V. Effect of gaps and overlaps when laying prepregs on the mechanical properties of carbon plastics (review) // Proceedings of VIAM. 2018. No. 12. DOI: 10.18577/2307-6046-2018-0-12-71-78. URL: https://test.viam.ru/en/journal/2018/12/8
Keywords
ATL, AFP, polymer composite materials, gaps, overlaps, defects, automatic placement.
Abstract

Abstract of the article "The effect of gaps and overlaps on the mechanical properties of polymer composite materials (review)."

This article discusses the effect of such defects in polymer composite materials as gaps and overlaps, their effect on the strength and rigidity of the material being manufactured.

As is known, the use of polymer composite materials in industry is currently increasing. One of the methods for obtaining parts from composite materials is the automated layout of narrow bands - AFP and the automated layout of wide bands - AFP. Automation is of great importance for the industry, as productivity increases, costs are reduced, waste is reduced. Manual layout can not meet the needs of a developing industry.

However, in the production of complex structures, defects can form - gaps and overlaps, parallel to the direction of the fiber. These defects can reduce the physical and mechanical properties of the material, change the local geometry and microstructure.

Recently, AFP and ATL have been modernized through mathematical modeling, but small gaps and overlaps are still present in the structure of the material and cannot be removed, since these defects are an integral part of the material layout. Gaps and defects of no more than 1.5 - 2 mm in size are allowed.

The results of various experiments showed that the shear strength readings decrease by an average of 5–15%, compressive strength by 12–20%, flexural strength by 12%, and with a combination of several defects, compressive strength can be reduced by 55% .

Since in the manufacture of complex parts it is impossible to remove small gaps and overlaps, it is necessary to reduce their nu

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