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RISS 인기검색어
- 검색키워드
- 저자 : H. Torabi (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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M. Shariati,H. Hatami,H. Torabi,H.R. Epakchi 국제구조공학회 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.44 No.6
The ratcheting characteristics of cylindrical shell under cyclic axial loading are investigated. The specimens are subjected to stress-controlled cycling with non-zero mean stress, which causes the accumulation of plastic strain or ratcheting behavior in continuous cycles. Also, cylindrical shell shows softening behavior under symmetric axial strain-controlled loading and due to the localized buckling, which occurs in the compressive stress-strain curve of the shell; it has more residual plastic strain in comparison to the tensile stress-strain hysteresis curve. The numerical analysis was carried out by ABAQUS software using hardening models. The nonlinear isotropic/kinematic hardening model accurately simulates the ratcheting behavior of shell. Although hardening models are incapable of simulating the softening behavior of the shell, this model analyzes the softening behavior well. Moreover, the model calculates the residual plastic strain close to the experimental data. Experimental tests were performed using an INSTRON 8802 servo-hydraulic machine. Simulations show good agreement between numerical and experimental results. The results reveal that the rate of plastic strain accumulation increases for the first few cycles and then reduces in the subsequent cycles. This reduction is more rapid for numerical results in comparison to experiments.
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Shariati, M.,Hatami, H.,Torabi, H.,Epakchi, H.R. Techno-Press 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.44 No.6
The ratcheting characteristics of cylindrical shell under cyclic axial loading are investigated. The specimens are subjected to stress-controlled cycling with non-zero mean stress, which causes the accumulation of plastic strain or ratcheting behavior in continuous cycles. Also, cylindrical shell shows softening behavior under symmetric axial strain-controlled loading and due to the localized buckling, which occurs in the compressive stress-strain curve of the shell; it has more residual plastic strain in comparison to the tensile stress-strain hysteresis curve. The numerical analysis was carried out by ABAQUS software using hardening models. The nonlinear isotropic/kinematic hardening model accurately simulates the ratcheting behavior of shell. Although hardening models are incapable of simulating the softening behavior of the shell, this model analyzes the softening behavior well. Moreover, the model calculates the residual plastic strain close to the experimental data. Experimental tests were performed using an INSTRON 8802 servo-hydraulic machine. Simulations show good agreement between numerical and experimental results. The results reveal that the rate of plastic strain accumulation increases for the first few cycles and then reduces in the subsequent cycles. This reduction is more rapid for numerical results in comparison to experiments.
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Micromechanical analysis of unidirectional polymeric composites material with triangular fibers
F. Barati,E. Torabi,H. Veiskarami,A. Khanbabaea Nava,M. M. Attar 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.10
The purpose of this study is to investigate the mechanism of load transfer in unidirectional polymeric composites material with triangular fibers in the presence of broken fibers. It is assumed that all fibers with triangle-cross section lie in a same direction while loaded by a load at infinity. In previous studies, the behavior of polymeric matrix is assumed elastic, while the behavior of most polymeric matrix is elastic-perfect plastic. For this purpose, equilibrium equations by use of shear-lag theory have been derived and by proper using boundary and boundness conditions, displacement field and stress distribution were computed. Finally, the results of stress concentrations and di shear stress, at neighbor of broken fibers for carbon-epoxy composite material were extracted and compared with composite materials with circular fibers. The analytical results are compared to the detailed finite element values. A close match is observed between the two methods.
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Fabrication of thin porous electrolyte-supported tubular fuel cells using slip casting
Amir Reza Hanifi,Alireza Torabi,Alyssa Shinbine,Thomas H. Etsell,Partha Sarkar 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.3
In the current research the third generation of tubular solid oxide fuel cells (SOFCs) which is believed to solve the redox cycling problem is introduced and the cell configuration is discussed. This type of ceramic fuel cell consists of a slip cast porous support of approximately 500 μm thickness coated with a thin dense electrolyte layer both made of calcined YSZ. The porous support can have up to 50% porosity as a result of both the preliminary calcination of YSZ powder and the addition of a pore former. Different parameters that affect the porosity content and thickness of the supports are also studied. It is shown that the short casting time required for high porosity tubes can be controlled by modifying the solid loading of the slip and/or the porosity of the plaster mold. Finally, multiple casting is introduced as a coating method in which the electrolyte layer with the required thickness can be slip cast directly onto the porous support.
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