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Overview of polymer laminates applicable to elements of light-weight ballistic shields of special purpose transport means

Sliwinski M., Kucharczyk W., Guminski R.

Scientific Journal of the Military University of Land Forces

2018

Vol. 50, No. 3(189)

228--243

The paper reviews and evaluates the possibility of using polymer fibrous composites for lightweight passive bulletproof armors for application in special-purpose means of transport. The shielding properties of the composite ballistic plates manufactured based on fibers commonly used for such applications: aramid (Kevlar, Twaron) and polyethylene ones (Spectra, Dyneema) as well as ceramic-laminate systems built based on the both above-mentioned ones have been characterized. Examples of application of lightweight, polymer ballistic laminates in armors and supplementary armors of special-purpose transport vehicles, illustrated by aircraft constructions, have been presented in accordance with literature sources and manufacturers' information.

Analiza numeryczna wybranych próbek, zaprojektowanych do wyznaczania GIIIc w odniesieniu do polimerowych kompozytów warstwowych

Czarnocki P.

Zeszyty Naukowe Politechniki Świętokrzyskiej. Mechanika

1999

Z. 68, t. 1

83--89

W pracy zamieszczono wyniki numerycznej analizy próbek mogących mieć zastosowanie do wyznaczania GIIIc w odniesieniu do laminatów polimerowych. Analizowano rozkłady GI, GII i GIII wzdłuż czoła rozwarstwienia. Stwierdzono, że w przypadku każdej z analizowanych próbek rozkład GIII jest nierównomierny a ponadto, prócz komponentu GIII, pojawiają się komponenty GI bądź też GII i GI łącznie. Powoduje to istotne komplikacje i uniemożliwia wyznaczenie krzywej R.

The presented analysis focuses the distribution of the components of the strain energy release rate along the delamination fronts in the specimens that had been designed for determination of GIIIc. Five different designs were analyzed with the use of FEM. To determine the distributions of the strain energy release rate components along the delamination fronts the crack closure integral method was applied. It was found that non of the analyzed specimens could produce Mode III loading exclusively. In all the cases mixed mode loading took place. The degree of the mixity varied depending on location. Also, it was found that the distribution of GIII was not uniform and that the value of GIII depended on location along the delamination front. Presented results of the additional numerical analysis indicate that the initial non uniform distribution of the strain energy release is the cause of the bending of the originally straight delamination front line. Due to the bending the significant redistribution of the strain energy release rate components, the changes in the magnitude of the strain energy release rate components and the degree of their mixity occur. It was concluded that for those reasons no one of the specimens under consideration could be used for determination of the propagation value of GIIIc.