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á à Á À é è É È ç Ç ê
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½ ⅓ ⅔ ¼ ¾ ⅛ ⅜ ⅝ ⅞ ¹ ² ³ ⁴ ⁿ ₁ ₂ ₃ ₄
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      저자 : Ali Vakili-Tahami (검색결과 2 건)
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      • KCI등재

        Analysis of the hydrodynamic torque effects on large size butterfly valves andcomparing results with AWWA C504 standard recommendations

        Farid Vakili-Tahami,Mohammad Zehsaz,Mahdi Mohammadpour,Ali Vakili-Tahami 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.9

        Butterfly valves are widely used in various industries such as water distribution, sewage, oil and gas plants. The hydrodynamic torque applied on the butterfly valve disk is one of the most important factors which should be considered in their design and application. Although several methods have been used to calculate the total torque on these valves, most of them are based on hydrostatic analysis and ignore the hydrodynamic effect which has a major role to determine the torque of the large-size valves. For finding the dynamic-valvetorque,some empirical formulas and methods have been proposed; for example in AWWA C504 standard, a relationship for calculating the dynamic torque has been given and its variation versus disk angle has been stated. However, the use of these empirical relationships is restricted due to the conditions defined in the standards. In this paper, the dynamic-valve-torque has been calculated for a large butterfly valve under different conditions and also at the different opening angles of the valve disk. For this purpose a computational fluid dynamics (CFD) method has been used. The results have been compared with those given in the AWWA C504 standard recommendations. Moreover, the effects of the disk shape and its deformation, surface roughness, upstream/downstream pressure variation and disk-offset value have been studied.

      • KCI등재

        Creep analysis of adhesively bonded single lap joint using finite element method

        Mohammad Zehsaz,Farid Vakili-Tahami,Mohammad-Ali Saeimi-Sadigh 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.7

        Adhesive joints are being used widely in engineering industries due to the increasing demand for designing lightweight structures. Becauseof the physical properties of the most adhesives, they creep even at room temperature. Therefore, the creep behavior of a single lapadhesive joint is studied in this paper. For this purpose, using the experimental data, creep constitutive equations for the adhesive hasbeen obtained. Then, these equations have been employed to investigate the creep behavior of the joint. The results show that due to thecreep straining, the stresses in the joint corners, decrease. However, creep strain accumulates in these areas which this in turn may lead toseparation of adhesive from adherent. In order to eliminate the effect of strain accumulation, two modifying methods have been proposedin this paper: increasing the layer thickness and using filleted joints.

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