# مقالههای a davar

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##### ۱Free vibration of functionally graded circular cylindrical shell under internal pressure

اطلاعات انتشار:
هفدهمین کنفرانس سالانه مهندسی مکانیک،
سال ۱۳۸۸

تعداد صفحات:
۸

Free vibration of simply supported circular cylindrical shell made of functionally graded material (FGM) under internal pressure was investigated .<\div>

##### ۲Low–Velocity Impact Response Analysis of Fibre–Metal Laminate (FML) Circular Cylindrical Shells Using A Simple New Contact Force Estimation Procedure

اطلاعات انتشار:
دومین کنفرانس بین المللی کامپوزیت،
سال ۱۳۸۹

تعداد صفحات:
۶

In this paper, low–velocity impact response analysis of fibre–metal laminate (FML) circular cylindrical shells is achieved using a simple new contact force estimation procedure. The boundary conditions are assumed to be fully simply supported. The material behavior is assumed to be linear elastic. The analysis is based on first–order shear deformation theory and the Fourier series method is used to solve the governing equations of the FML shell analytically. Low–velocity impact analysis due to a large mass impactor is studied and the response is assumed to be quasi–static. Hence, in the simple new contact force estimation procedure, the history of contact force is primarily assumed to be a half–sine. Then, the maximum contact force and the contact duration are both solved analytically. Validity of the results of the present analysis is confirmed by comparing them with the theoretical as well as experimental results available in the literature. Effects of some parameters like metal volume fraction (MVF), FML layup, mass and velocity of the impactor on the impact response are investigated. Some new results are obtained, not hitherto reported in the published literature. The results indicate that these parameters are important factors affecting the impact response of the FML shells.<\div>

##### ۳Free Vibration and Buckling Analysis of Thick Composite Cylindrical Shells Using New Refined Higher–Order Shell Theory

اطلاعات انتشار:
همایش یافته های نوین در هوافضا و علوم وابسته،
سال ۱۳۹۴

تعداد صفحات:
۱۱

In this paper, a closed–form formulation of three–dimensional (3–D) refined higher–order shell theory (RHOST) to analyze the free vibration and buckling analysis of thick composite laminated circular cylindrical shells is presented. The circular cylindrical shell is considered as composite cross–ply laminated shell with orthotropic layers and simply supported boundary conditions at both ends. The theory is a modification of the Reddy's theory for circular cylindrical shells and accounts for parabolic distribution of the transverse shear strains through thickness of the shell and tangential stress–free boundary conditions on the boundary surfaces of the shell. The proposed theory is used to investigate the effects of in–plane and rotary inertias as well as transverse normal and shear strains on the dynamic and static response of composite cylindrical shells. By using Hamilton’s principle, the equations of motions are obtained and solved using the Galerkin method. Numerical results for the natural frequencies of composite circular cylindrical shell are verified by making comparison with those in the literature. Results show that new verified method with less mathematical process is accurate in compare with Reddy's and 3–D Elasticity theories to obtain results of the free vibration analysis<\div>

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