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- 저자 : Kenan Cinar (검색결과 2 건)
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Kenan Cinar,Sunal Ahmet Parasiz,Mustafa Akbulut,S. Ozmen Eruslu 한국섬유공학회 2022 Fibers and polymers Vol.23 No.9
In this study, the influence of particle shapes on the elastoplastic response of composite materials is investigatedboth experimentally and computationally. Flake, spherical, irregular, and rod type glass particles are used as filler in theepoxy matrix material in various mass fractions: 5, 10, 15 %. For each investigated composite material, mechanicalproperties such as elastic modulus, tensile strength, and tensile fracture strain are determined by experimentally obtainedstress-strain curves. Flake and irregular particle types give the maximum and minimum elastic modulus values, respectively. The addition of glass particles has an adverse effect on the tensile strength and tensile fracture strain. The worst filling typesin terms of tensile strength and tensile fracture strain are the flake and the irregular ones due to the stress concentrations at thesharp edges and corners present on these filler particles under loading conditions. On the otherhand, for spherical type fillersthat have no sharp corners, debonding seem to be the main failure mechanism. Representative volume element (RVE)approach is utilized to determine experimentally identified properties by means of Finite Element Method. In the model, thedebonding among particle and matrix components is simulated through the cohesive zone model (CZM). Computationaloutputs are quite well compliant with experimental results. Experimental results and computational analysis indicate thatalong with the aspect ratio, some other morpohological characteristics of particles have a marked effect on the mechanicalproperties of the particle filled composites, such as presence of sharp corners and edges on the particle geometry and surfacearea to volume ratio of the particles.
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Abdulkerim Aksoy,Kenan Cinar 대한수의학회 2009 JOURNAL OF VETERINARY SCIENCE Vol.10 No.1
The ontogeny and distribution of gastrin- and serotoninimmunoreactive (IR) cell in the proventriculus of chicks (Gallus gallus domestica, n = 60) in different growth periods was examined immunohistochemically using antisera specific to gastrin and serotonin. Gastrin and serotonin-IR cells were detected in chick proventriculus. Gastrin-IR cells were first evident after 12 days of incubation in lamina epithelialis and compound glands, while serotonin- IR cells were observed only in compound glands at that same time. Gastrin-IR and serotonin-IR cells increased in frequency on incubation day 14 and 16, respectively. Towards the end of incubation, gastrin- and serotonin-IR cell numbers decreased. In adult chicken, both IR cells were present but not lower numbers. The observations demonstrate the presence of gastrin- and serotonin-IR cells in the proventriculus of developing chicks in temporally changing frequencies.
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