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RISS 인기검색어
- 검색키워드
- 저자 : Arbab-Chirani Reza (검색결과 2 건)
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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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Gouédard Charlotte,Pino Laurent,Arbab-Chirani Reza,Arbab-Chirani Shabnam,Chevalier Valérie 대한치과보존학회 2022 Restorative Dentistry & Endodontics Vol.47 No.2
Objectives This study compared the cyclic fatigue resistance of One Curve (C wire) and F6 Skytaper (conventional austenite nickel-titanium [NiTi]), and 2 instruments with thermo-mechanically treated NiTi: Protaper Next X2 (M wire) and Hyflex CM (CM wire). Materials and Methods Ten new instruments of each group (size: 0.25 mm, 6% taper in the 3 mm tip region) were tested using a rotary bending machine with a 60° curvature angle and a 5 mm curvature radius, at room temperature. The number of cycles until fracture was recorded. The length of the fractured instruments was measured. The fracture surface of each fragment was examined with a scanning electron microscope (SEM). The data were analyzed using one-way analysis of variance and the post hoc Tukey test. The significance level was set at 0.05. Results At 60°, One Curve, F6 Skytaper and Hyflex CM had significantly longer fatigue lives than Protaper Next X2 (p < 0.05). No statistically significant differences were found in the cyclic fatigue lives of One Curve, F6 Skytaper, and Hyflex CM (p > 0.05). SEM images of the fracture surfaces of the different instruments showed typical features of fatigue failure. Conclusions Within the conditions of this study, at 60° and with a 5 mm curvature radius, the cyclic fatigue life of One Curve was not significantly different from those of F6 Skytaper and Hyflex CM. The cyclic fatigue lives of these 3 instruments were statistically significantly longer than that of Protaper Next. Objectives This study compared the cyclic fatigue resistance of One Curve (C wire) and F6 Skytaper (conventional austenite nickel-titanium [NiTi]), and 2 instruments with thermo-mechanically treated NiTi: Protaper Next X2 (M wire) and Hyflex CM (CM wire). Materials and Methods Ten new instruments of each group (size: 0.25 mm, 6% taper in the 3 mm tip region) were tested using a rotary bending machine with a 60° curvature angle and a 5 mm curvature radius, at room temperature. The number of cycles until fracture was recorded. The length of the fractured instruments was measured. The fracture surface of each fragment was examined with a scanning electron microscope (SEM). The data were analyzed using one-way analysis of variance and the post hoc Tukey test. The significance level was set at 0.05. Results At 60°, One Curve, F6 Skytaper and Hyflex CM had significantly longer fatigue lives than Protaper Next X2 (p < 0.05). No statistically significant differences were found in the cyclic fatigue lives of One Curve, F6 Skytaper, and Hyflex CM (p > 0.05). SEM images of the fracture surfaces of the different instruments showed typical features of fatigue failure. Conclusions Within the conditions of this study, at 60° and with a 5 mm curvature radius, the cyclic fatigue life of One Curve was not significantly different from those of F6 Skytaper and Hyflex CM. The cyclic fatigue lives of these 3 instruments were statistically significantly longer than that of Protaper Next.
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