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Investigation of the Electromagnetic Shielding Effectiveness of Needle Punched Nonwoven Fabrics Produced from Stainless Steel and Carbon Fibres

Ozen M. S., Usta I., Yuksek M., Sancak E., Soin N.

Fibres & Textiles in Eastern Europe

2018

Vol. 26, no. 1 (127)

94--100

The electromagnetic shielding effectiveness (EMSE) of needle punched, nonwoven fabrics produced using staple stainless steel and carbon fibres was investigated. Utilising carding and large scale industrial type needle punching machines, webs of staple stainless steel and carbon fibres were produced, which were subsequently bonded on the needle punching machine at approximately 132 punches/cm2 and 13.5 mm needle penetration depth. The effect of varying the carbon fibre content was studied by varying the blend ratio of stainless steel and carbon fibres between 5-20%. EMSE measurements of as-produced needle punched nonwoven fabrics were carried out using the coaxial transmission line method (ASTM D4935-10) in the frequency range of 15-3000 MHz. Within the range, the EMSE values were enhanced from 22.3 dB (95/5, stainless steel/carbon) to 44.7 dB (80/20, stainless steel/carbon), which was attributed to the enhanced conductivity of the fabrics. In fact, the surface resistivity of the samples decreased from 5.80E + 3 Ω to 2.43E + 2 Ω, enhanced for 95:5 and 80:20 stainless steel/carbon blends.

Zbadano efektywność ekranowania elektromagnetycznego (EMSE) igłowanych włóknin wykonanych z wykorzystaniem stali nierdzewnej i włókien węglowych. Wytworzono włókniny ze stali nierdzewnej i włókien węglowych, które spajano na maszynie do igłowania przy około 132 uderzeniach / cm2 i głębokości penetracji 13,5 mm. Zbadano wpływ zmiany zawartości włókien węglowych poprzez zmianę stosunku mieszanki stali nierdzewnej i włókien węglowych w zakresie 5-20%. Pomiary EMSE wytwarzanych w ten sposób igłowanych włóknin wykonano metodą współosiowej linii transmisyjnej (ASTM D4935-10) w zakresie częstotliwości 15-3000 MHz. Stwierdzono, że wartości EMSE zostały zwiększone z 22,3 dB (95/5, stal nierdzewna / węgiel) do 44,7 dB (80/20, stal nierdzewna / węgiel), co zostało przypisane zwiększonej przewodności wyrobów.

Mechanical behaviour of chicken quills and chicken feather fibres reinforced polymeric composites

Uzun M., Sancak E., Patel I., Usta I., Akalin M., Yuksek M.

Archives of Materials Science and Engineering

2011

Vol. 52, nr 2

82-86

Purpose: The objective of this study is to utilise and evaluate the mechanical properties of the chicken feather quill and fibre reinforced vinylester and polyester composites. Design/methodology/approach: Prior to production of the composites, the chicken feather fibres (CFF) were cleaned, tested and analyzed in terms of physical properties; linear density and tensile behaviour. The unidirectional CFF reinforced composites were produced with vinylester and polyester resins with three fibre reinforcement loadings (2.5, 6, 10wt%). Following experiments were conducted to determine physical properties of the control (0%) and CFF reinforced composites; tensile, flexural and Charpy impact testing. Findings: It was found that the impact properties of the CFF reinforced composites are significantly better than the control composites however both the tensile and the flexural properties of the CFF reinforced composites have poorer values compared to the control composites. For the 10% CFF reinforced vinylester composite, Charpy impact value was 4.42 kgj/mm2 which was 25% higher than the control vinylester composites (3.31 kgj/mm2) and also for the 10% CFF reinforced polyester (4.56 kgj/mm2) composite had three times better impact resistance than the control composite (1.85 kgj/mm2). Practical implications: The CFF reinforced composite have potential applications due to its improved impact behaviour. Originality/value: If the poultry waste can be utilised and used any engineering applications they will be preferred due to low-cost and superior characteristics and the most importantly they will not cause ecological and health problems.