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RISS 인기검색어
- 검색키워드
- 저자 : Danica Simić (검색결과 2 건)
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Vera Obradović,Danica Simić,Milorad Zrilić,Dušica B. Stojanović,Petar S. Uskoković 한국섬유공학회 2021 Fibers and polymers Vol.22 No.2
Multilayered composites based on aramid fabrics are widely used in impact protection. The objective of this studyis creating a new kind of multiaxial aramid fabric composites with inorganic fullerene-like tungsten disulfide nanoparticles(IF-WS2) and single walled carbon nanotubes (SWCNT) used as nanoreinforcement to enhance the dynamic mechanical andanti-stabbing properties of the composites. The four composites of the Kolon fabric forms were impregnated with 10 wt.%poly(vinyl butyral) (PVB)/ethanol solution which contained different forms of IF-WS2 nanoparticles. The surfaces of IF-WS2were coated with silane coupling agent (m-IF) and the SWCNT were oxidized (o-SWCNT) for the fabrication of the o-SWCNT/m-IF hybrid nanoparticles. The mechanical testing showed that the Kolon/PVB/o-SWCNT/m-IF sample producednearly 62 % of improvement in the tensile strength and 51 % of improvement in the tensile energy absorption compared tothe Kolon/PVB sample. Furthermore, the sample with the o-SWCNT/m-IF hybrid nanoparticles demonstrated 24 % ofenhancement in the impact toughness and 48 % of improvement in the absorbed energy after knife penetration in comparisonwith the Kolon/PVB sample.
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Moisture absorption characteristics and effects on mechanical properties of Kolon/epoxy composites
Obradović Vera,Simić Danica,Sejkot Petr,Machalická Klára V.,Vokáč Miroslav 한국물리학회 2021 Current Applied Physics Vol.26 No.-
Para-aramid fibers (Kolon) are high performance polymeric fibers characterized by their high tenacity and impact resistance. They are used for the soft body armor structures in ballistics. In this study, the testing specimens were made from multilayered Kolon fabrics impregnated with epoxy resin where silicon carbide (SiC) microparticles or SiC nanofibers were added as reinforcement. The laminated composite samples were fabricated by hot compression and curing of epoxy resin. The tensile and impact strengths of the untreated specimens were compared with the ones that underwent water absorption in duration of 72 h (immersion or humidity) followed by desorption. The immersion of the specimens in water and exposure to high humidity (70%) were performed according to the ISO 62 standard while the tensile test was carried out in accordance with the ASTM D 3039 standard. In the end, the tensile test simulation of the laminated composite by using software Abaqus® was accomplished.
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