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2 2016

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Failure analysis of poly(phenylene sulphide)/short glass fibre composite in bending strength test

Ostapiuk M.

Inżynieria Materiałowa

2016

Vol. 37, nr 5

272--277

Nowadays polymer composites are one of the most popular materials in the field of science and applying engineering. They combine various advantages, which are easy to manufacture, cost effectiveness and excellent performance. The great importance is choosing of an appropriate matrix for special composites elements working in different conditions. Very interesting technical material seems to be the thermoplastic resin poly (phenylene sulphide) (PPS) which can be used in automobiles, aircrafts and electro-/electronics technologies. Conventional thermoset composites have in recent years successfully found engineering applications but in contrast to PPS they have been limited for applying at higher temperature and difficulties in recycling. Regarding the lack of knowledge in terms of precise understanding on the failure basis, there has been not many publications on the degradation mechanisms of PPS with short glass fibres. In this article, the PPS/fibre fillers (containing 30% and 40% short glass fibers) has been introduced. It has been showed and discussed the phenomena and structure characterization after three point bending tests. It was carried out the macro- and microstructural observation. The plots of stress vs displacement indicate to brittle materials behaviour. All samples of the PPS 30% and PPS 40% composites subjected to 3-points bending test were destroyed in in the centre of the sample. It was confirmed that in short fibre composites, generally, the failure process is dictated by fibre/matrix separation which usually starts near the fibre ends. The scheme of cracking is similar regardless of fibre content. The bending stresses were higher in the composite with higher volume fraction of fibres.

Istnieje niewiele doniesień w literaturze na temat zjawisk zachodzących w kompozytach termoplastycznych podczas badań wytrzymałościowych, a w szczególności dotyczy to kompozytów wzmacnianych krótkimi włóknami. Dlatego celem artykułu jest analiza zniszczenia i zmian w strukturze kompozytu o osnowie poli(siarczku fenylenu) (PPS) wzmacnianego krótkimi włóknami szklanymi w badaniach wytrzymałości 3-punktowego zginania.

Bio-composites based on polypropylene filled with waste of camellia sinensis

Kucukdogan N., Ozturk S., Sutcu M.

Archives of Materials Science and Engineering

2016

Vol. 79, nr 1

12--18

Purpose: This study aims to examine the properties of polypropylene (PP) composites filled with household waste tea (camellia sinensis) (HWT) to development of their mechanical properties and also to gain the economic value of HWT. Design/methodology/approach: HWT was grinded using a disk mill in the finely powder form. Prepared finely tea powders were characterized compositional and morphologically by using Fourier transform infrared spectroscopy, X-Ray diffractometer and scanning electron microscope. PP composites were prepared at different proportions of HWT ranging from 0 wt% to 40 wt% with two particle sizes (<30 µm and <60 µm) by high-volume energy mixer so as to evaluate the effect of the HWT filler on mechanical properties. Findings: The mechanical properties of composites were evaluated through modulus of elasticity, ultimate tensile strength and flexural strength in terms of filler particle size and filler contents. The results showed that the modulus of elasticity of composites increased as a function of additional HWT particles and the highest value was observed which was containing 40 wt% filler contents. Research limitations/implications: Clearly, the maximum flexural and tensile strength of HWT particles filled composites were observed for 10 wt% HWT loading into PP composite increased when compared to other filler contents (20-40 wt%). Practical implications: For potential applications in the plastics industry, such as outdoor deck floors, cladding and siding, indoor furniture etc., it is desirable to form polymer composite systems by combining phases with polymer, so as to reduce expenses of materials, to have strength and, at the same time to be biodegradable. Originality/value: Despite HWT was chemically untreated, the mechanical properties of composites increased it would appear that it can be a renewable alternative material for manufacturing of PP matrix composites.