Wyniki wyszukiwania - BazTech

1

Effect of nano-kaolinite weight fraction on interfacial shear strength of fibre reinforced nanocomposite

Hasan Hisham Mohammed Ali, Hasan Bahaa Aldin Abass

Composites Theory and Practice

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2022

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R. 22, nr 1

16--20

EN

Many studies around the world focus on the use of organic and inorganic additions to polymer composites to enhance their mechanical properties. Investigations were conducted to study the mechanical properties of composites with nano-kaolinite weight fractions of 1, 3, 5, 7, and 12% incorporated into an epoxy matrix. Further investigations were carried out on the diffusion of the epoxy nano-kaolinite monomer into the interfibrillar space when polypropylene and Kevlar rope fibre were added. The Kevlar fibre/matrix and polypropylene fibre/matrix interfacial shear strength was evaluated by the single fibre drag-out method. The highest interfacial shear strength was observed at a 5 wt.% nano-kaolinite content. Energy-dispersive X-ray spectroscopy (EDX) and scanning electron microscopy (SEM), as well as characterisation by X-ray diffraction (XRD), were performed on all the epoxy/nano-kaolinite, Kevlar specimens.

2

Influence of fiber reinforcement towards the physical characteristics of low density polyethylene laminated composites

Ravichandran S., Raj A. Daniel, Visvanath P. Balaji, Mohammad Faruq, Al-Lohedan Hamad A., Sagadevan Suresh

Polimery

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2020

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T. 65, nr 6

449--457

EN

In recent years, the increased interest in the design and fabrication of lightweight polymer composites with various combinations and stoichiometry is due to their enhancement of electrical, mechanical, thermal, and biological properties compared to the properties of conventional materials. With that view, the present study deals with the effects of low density polyethylene composites (LDPE) reinforced with epoxy resin, glass fiber, carbon fiber, and Kevlar towards the mechanical, thermal, and water absorption properties. The mechanical studies showed that the LDPE composite reinforced carbon fiber has the best tensile properties compared to other composites and this can be mostly due to the proper bonding and associated interaction between the polymeric matrix and the bidirectional layer of the fibers. Also, the carbon fiber reinforced composite has superior properties of impart energy compared to the other composites and the non-reinforced ones and this is attributed to the crystalline nature of carbon fiber. Further studies of the thermal properties indicated that the retention of thermal stability for all the fiber-reinforced polymer composites, while the water absorption revealed a considerable increase in the weight of Kevlar fiber-reinforced composite. From the overall analysis, the enhanced properties of LDPE matrix reinforced fibers are linked to the morphological changes that occurred and are directly affected by the nature of the fiber.

PL

Zwiększone w ostatnich latach zainteresowanie projektowaniem i wytwarzaniem lekkich kompozytów polimerowych wynika z ich lepszych właściwości elektrycznych, mechanicznych, termicznych i biologicznych w porównaniu z cechami materiałów konwencjonalnych. Zbadano wpływ rodzaju wzmocnienia (włókno szklane, włókno węglowe i włókno Kevlar) na właściwości mechaniczne, termiczne i absorpcję wody laminatowych kompozytów polietylenu małej gęstości (LDPE) z żywicą epoksydową. Stwierdzono, że kompozyt LDPE z włóknem węglowym, w porównaniu z innymi kompozytami, wykazuje najlepszą wytrzymałość na rozciąganie, co może wynikać głównie z interakcji polimerowej osnowy z dwukierunkową warstwą włókien. Ponadto kompozyt ten ma większą zdolność przenoszenia energii niż pozostałe badane kompozyty, co można przypisać krystalicznej budowie włókna węglowego. Badania właściwości termicznych wykazały stabilność termiczną wszystkich kompozytów polimerowych wzmocnionych włóknami oraz znaczną absorpcję wody kompozytu wzmocnionego włóknem Kevlar.

3

Surowce na ubrania ochronne. Włókna wysokowytrzymałe

Frydrych I., Sikorski K.

Przegląd Włókienniczy - Włókno, Odzież, Skóra

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2011

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nr 1

34-38

4

Energy absorption capacities of square tubular structures

Hamouda A. M. S., Saied R. O., Shuaeib F. M.

Journal of Achievements in Materials and Manufacturing Engineering

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2007

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Vol. 24, nr 1

36-42

EN

Purpose: The purpose of the paper is to presents a study of the energy absorption of square tubular structures. Design/methodology/approach: Tubes of three materials namely, mild steel, glass reinforced composite and Kevlar reinforced composite were used to observe their deformation and energy absorption characteristics. The tubular structures energy absorption characteristic was reviewed from both the materials and structural points of view. Axial crushing tests were carried out on the tubes under quasi-static loading condition. Findings: The load-displacement curves of the tested tubes were presented and described. In addition, the deformation processes of the tubes was analyzed and evaluated. Several fracture modes of the crushed tubes were observed in most cases. Research limitations/implications: It has been found that parameters such as thickness, type of fiber and length of tubes has a considerable effect on the crushing characteristic of collapsed tubes. Originality/value: Description of crushing behavior of the energy absorption characteristic of glass/polyester and Kevlar/polyester thin-walled composite square tubes under quasi-static axial crushing load.