Wyniki wyszukiwania - BazTech

1

Experimental analysis of puncture resistance of aramid laminates on styrene-butadiene-styrene and epoxy resin matrix for ballistic applications

Pach Joanna, Mayer Paulina, Jamroziak Krzysztof, Polak Sławomir, Pyka Dariusz

Archives of Civil and Mechanical Engineering

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2019

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Vol. 19, no. 4

1327--1337

EN

The work aimed to evaluate the influence of the type of matrix and the number of reinforcement layers on the puncture of aramid laminates. The samples were examined under laboratory conditions and in ballistic tests. Two series of aramid laminates were produced with different types of the polymer matrix. The epoxy resin (EP) and the styrene-butadiene-styrene (SBS) copolymer were used as the matrix. For comparison, a puncture test was performed for the fabric with the same number of layers in contrast to the laminates. Laboratory tests were carried out using the InstronDynatup 9250 HV drop hammer. The results obtained during the laboratory and ballistic examinations were compared. The samples were fired with a 9 - 19 mm Parabellum projectile. Research into the low-velocity range have shown that SBS laminates absorb impact energy more effectively than epoxy resin ones, but they are similar to fabrics without a polymer matrix. The results of ballistic tests are divergent and indicate that unbound materials are more efficient at absorbing energy than laminates. The reason for this is the different damage mechanisms.

2

Numerical and Experimental Analysis for Shape Improvement of a Cruciform Composite Laminates Specimen

Gutiérrez J. C., Lozano A., Manzano A., Flores M. S.

Fibres & Textiles in Eastern Europe

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2016

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Vol. 24, no. 2 (116)

89--94

EN

The use of composite materials has spread to different applications among which, those using thin sheet plates subjected to biaxial loads are commonly used in the car and aerospace industries. Hence, there is need of a reliable specimen to test these materials under biaxial loads. This reliability depends on measurements that are accurate and repeatable. Thus these measurements depend on the proper design of specimens. This paper reviews the development of cruciform specimens of carbon fibre composite materials and how the geometric shape has evolved. Based on this review, a new geometric shape is proposed. This improvement is based on numerical analysis of the specimen and tests results of experimental measurements carried out using a four piston rig in an orthogonal arrangement. Deformation is measured in the centre of the specimen using strain gauges. By obtaining the principal stresses, it was found that maximum stresses occur in the centre of the specimen.

PL

Powszechnie stosowane są kompozyty poddawane testom dwuosiowym. Prawidłowe przeprowadzenie tego rodzaju testów jest trudne biorąc pod uwagę rozkład naprężeń badanych w próbce. Omówiono szereg struktur stosowanych dla uzyskania wyników dokładnych i powtarzalnych. Przeprowadzono analizę poprawy kształtu próbki rozpatrując laminat z udziałem włókien węglowych i żywicy epoksydowej. Przeprowadzono testy rozciągania dwuosiowego. Odkształcenia mierzono w centralnej części próbki stosując specjalne czujniki przesunięcia. Stwierdzono, że maksymalne naprężenia występują w środku próbki.

3

Determination of material parameters for microbuckling analysis of fiber reinforced polymer matrix composites

Romanowicz M.

International Journal of Applied Mechanics and Engineering

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2015

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Vol. 20, no. 2

373--383

EN

This research focuses on studying the effect of the constitutive law adopted for a matrix material on the compressive response of a unidirectional fiber reinforced polymer matrix composite. To investigate this effect, a periodic unit cell model of a unidirectional composite with an initial fiber waviness and inelastic behavior of the matrix was used. The sensitivity of the compressive strength to the hydrostatic pressure, the flow rule and the fiber misalignment angle were presented. The model was verified against an analytical solution and experimental data. Results of this study indicate that a micromechanical model with correctly identified material parameters provides a useful alternative to theoretical models and experimentation.

4

Blendy i kompozyty polimerowe

Zieliński J.

Polimery

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2002

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T. 47, nr 5

305-309

PL

Scharakteryzowano zagadnienia dotyczące podstaw wytwarzania oraz analizy, właściwości i zastosowania blend polimerowych. Omówiono też kompozyty na podstawie matrycy polimerowej, podkreślając zwłaszcza rolę matrycy w tworzeniu nowych jakościowo tworzyw konstrukcyjnych oraz znaczenie zjawisk zachodzących na granicy faz w strukturze kompozytów. Przegląd ten opiera się przede wszystkim na pracach przedstawionych na Kongresie IUPAC MACRO 2000.

EN

Manufacturing, analysis, properties and applications of polymer blends were characterized. Composites based on a polymer matrix were also discussed, stressing role of the matrix in designing novel construction materials and importance of interfacial phenomena in the composite structure. The review is based primarily on papers delivered at the IUPAC MACRO 2000 Congress.