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RISS 인기검색어
- 검색키워드
- 저자 : Ebrahimnezhad-Khaljiri (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Hossein Ebrahimnezhad-Khaljiri,Reza Eslami-Farsani,Saeid Talebi 한국섬유공학회 2020 Fibers and polymers Vol.21 No.11
In this research work, the effect of adding nanoclay on the high velocity impact behavior of fibers metal laminates(FMLs) of aluminum- Jute fibers/epoxy was investigated. To do so, the nanoclay particles with different percentages (0, 1, 3and 5 wt.%) were firstly added into the epoxy matrix. In the following, the FMLs with the configuration of 0/90/0/90/0 weremade by hand lay-up method. After that, the fabricated samples were tested by high velocity impact test. In order toinvestigate the effect of nanoparticles on the impact properties, the field emission scanning electron microscope (FESEM)was used. The obtained results showed that the samples with 0, 1, 3 and 5 wt.% had the limit velocity of 81.9, 83.7, 87.4 and85.4 m/s, respectively. The limit velocity increment in these samples by adding nanoclay were 2.2, 6.7 and 4.3 %,respectively. Also, the obtained results showed that by adding the 1, 3 and 5 wt.% nanoclay, the absorbed energy wasimproved about 4.5, 14 and 8.8 %, respectively. The sample with 3 wt.% nanoclay had minimum delamination lengthbetween aluminum shell and composite core, which was due to the effect of nanoclay in the interface adhesion of core-shell. The microscopically analysis showed that the nanoclay increased the fibrillation of Jute fibers as one of the absorbed energymechanisms in the Jute fibers. Also, the agglomeration phenomenon in the sample with the 5 wt.% nanoclay was illustrated,which was the decreasing factor of its impact properties, as comparison with sample with 3 wt.% nanoclay.
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Hossein Ebrahimnezhad-Khaljiri,Reza Eslami-Farsani,Sadegh Mirzamohammadi,Shabnam Arbab Chirani 한국섬유공학회 2022 Fibers and polymers Vol.23 No.10
The aim of this study is to assess the simultaneous effect of incorporating capsulated healing agent and silicananoparticles on the mechanical-healing behaviors of glass fibers/epoxy composites. To do so, the 14 wt.% capsulated epoxyhealing agent by urea-formaldehyde polymeric shell and the various percentage of silica nanoparticles (1, 3 and 5 wt.%) wereadded into the glass fibers-epoxy composites for studying the healing behavior under the tensile and flexural conditions. After the damaging and healing processes of composites, the maximum healing efficiency in flexural strength (110.7 %) wasseen in the composite containing 5 wt.% silica nanoparticles. But the highest healing efficiency in the tensile strength(64. 2%) belonged to the smart composite with 3 wt.% silica nanoparticles. The silica nanoparticles improved the recoverycapability of mechanical properties by changing the damage modes into the smart composites. Filling the micro-voids andreducing the effect of agglomerated nanoparticles by healing agent were the effective mechanisms, which improved themechanical recovery capability. The other observed phenomena by field emission scanning electron microscope wereimproving the adhesion between glass fibers and epoxy, creating the micro-voids by silica nanoparticles, wasting the crackpropagation energy by stick-slip method and reducing the flow ability of healing agent by silica nanoparticles.
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Hossein Rahmani,Reza Eslami-Farsani,Hossein Ebrahimnezhad-Khaljiri 한국섬유공학회 2020 Fibers and polymers Vol.21 No.1
This research work investigated the effects of SiO2 and ZrO2 nanoparticles type and content incorporated into anepoxy matrix on the high velocity impact behavior of carbon fiber reinforced aluminum laminates (CARALL). CARALLspecimens consisted of a 0/90/90/0 stacking sequence of a carbon-epoxy composite containing 0, 1, 3, 5 and 7 wt% of each ofnanoparticles sandwiched between two layers of aluminum 2024-T3. To observe the toughening effects of the nanoparticleson the fracture surface of the impacted CARALL, a typical field emission scanning electron microscope (FESEM) wasemployed. Impact energy absorption of CARALL was at most increased by 18 % and 12 % with the nanoparticles content of5 wt% SiO2 and 3 wt% ZrO2, respectively. Overloading of the nanoparticles content up to 7 wt% resulted in the creation ofnanoparticles aggregated sites associated with loss in the energy absorption capacity. FESEM fractography procedure alsoshowed that the crack deflection and pinning were the most recognizable toughening mechanisms exhibited by nanoparticles. Overall, the controlled addition of SiO2/ZrO2 rigid nanoparticles to CARALL was found to be a promising method forimproving the high velocity impact energy absorption of CARALL.
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