فهرس المقالات FSDT

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  1 - Dynamic Analysis of Carbon Nanotube-Reinforced Multilayer Composite Plates
  Jamshid Ebrahimi Jafar Eskandari Jam Reza Azarafza Mohsen Heydari Beni Majid Eskandari Shahraki
  10.30495/admt.2021.1905074.1206
  The paper studied the analysis of vibrations of rectangular carbon nanotube-reinforced composite plates. To this end, a three-layer nanocomposite plate - two layers with the targeted distribution of carbon nanotubes as FG-X at the top and bottom and a layer without an a أکثر

  The paper studied the analysis of vibrations of rectangular carbon nanotube-reinforced composite plates. To this end, a three-layer nanocomposite plate - two layers with the targeted distribution of carbon nanotubes as FG-X at the top and bottom and a layer without an amplifier in the middle of the plate - were analyzed. The governing equations for this problem are based on First-order Shear Deformation Theory (FSDT). The distribution of nanotubes on these plates is as targeted FG-X. The effect of various types of SWCNTs distributions in the direction of thickness on the vibrational behavior of nanocomposite plates was examined. The effective properties of nanocomposite materials Functionally Graded Carbon Nanotube-Reinforced Composite (FG-CNTRC) were estimated using the rule of mixtures. Detailed parametric studies were performed to determine the effects of the volume fraction of carbon nanotubes and the thickness-to-length ratio of the plate on the natural frequency responses and the shape of the plate mode. The equations obtained in this problem were coded in MATLAB software, the nanocomposite plate was modelled in ABAQUS software, and the comparison of the results obtained from the numerical solution with ABAQUS software showed relatively right consistency with the results obtained from the analytical solution. تفاصيل المقالة
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  2 - Effect of Temperature Dependency on Thermoelastic Behavior of Rotating Variable Thickness FGM Cantilever Beam
  M.M.H Mirzaei A Loghman M Arefi
  10.22034/jsm.2019.666768
  Thermoelastic behavior of temperature-dependent (TD) and independent (TID) functionally graded variable thickness cantilever beam subjected to mechanical and thermal loadings is studied based on shear deformation theory using a semi-analytical method. Loading is compose أکثر

  Thermoelastic behavior of temperature-dependent (TD) and independent (TID) functionally graded variable thickness cantilever beam subjected to mechanical and thermal loadings is studied based on shear deformation theory using a semi-analytical method. Loading is composed of a transverse distributed force, a longitudinal distributed temperature field due to steady-state heat conduction from root to the tip surface of the beam and an inertia body force due to rotation. A successive relaxation (SR) method for solving temperature-dependent steady-state heat conduction equation is employed to obtain the accurate temperature field. The beam is made of functionally graded material (FGM) in which the mechanical and thermal properties are variable in longitudinal direction based on the volume fraction of constituent. Using first-order shear deformation theory, linear strain–displacement relations and Generalized Hooke’s law, a system of second order differential equation is obtained. Using division method, differential equations are solved for every division. As a result, longitudinal displacement, transverse displacement, and consequently longitudinal stress, shear stress and effective stress are investigated. The results are presented for temperature dependent and independent properties. It has been found that the temperature dependency of the material has a significant effect on temperature distribution, displacements and stresses. This model can be used for thermoelastic analysis of simple turbine blades. تفاصيل المقالة
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  3 - Vibration Analysis of Carotid Arteries Conveying Non-Newtonian Blood Flow Surrounding by Tissues
  A.H Ghorbanpour Arani A Rastgoo A. Ghorbanpour Arani R Kolahchi
  The high blood rate that often occurs in arteries may play a role in artery failure and tortuosity which leads to blackouts, transitory ischemic attacks and other diseases. However, vibration and instability analysis of carotid arteries are lacking. The objective of thi أکثر

  The high blood rate that often occurs in arteries may play a role in artery failure and tortuosity which leads to blackouts, transitory ischemic attacks and other diseases. However, vibration and instability analysis of carotid arteries are lacking. The objective of this study is to investigate the vibration and instability of the carotid arteries conveying blood under axial tension with surrounding tissue support. Arteries are modeled as elastic cylindrical vessels based on first order shear deformation theory (FSDT) within an elastic substrate. The elastic medium is simulated with visco-Pasternak foundation. The blood flow in carotid artery is modeled with non-Newtonian fluid based on Carreau, power law and Casson models. Applying energy method, Hamilton principle and differential quadrature method (DQM), the frequency, critical blood velocity and transverse displacement of the carotid arteries are obtained. It can be seen that increasing the tissue stiffness would delay critical blood velocity. The current model provides a powerful tool for further experimental investigation arteries tortuosity. In addition, the dimensionless transverse displacement predicted by Newtonian model is lower than that of non-Newtonian models. تفاصيل المقالة
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  4 - تحلیل سازه‌ای و شبیه‌سازی عددی تیر کامپوزیت تحت بار متحرک نوسانی بر روی بستر ویسکوالاستیک پسترنک
  محمد جواد رضوانی روح الله رضایی
  در این مقاله، پاسخ دینامیکی تیر تیموشنکو با طول بینهایت تحت اثر بار متحرک نوسانی با استفاده از تئوری مرتبه اول برشی مطالعه می‌شود. تیر مورد نظر از جنس ماده مرکب ساخته شده و .روی بستر ویسکوالاستیک تعمیم یافته پسترنک قرار دارد. خصوصیات مکانیکی تیر در جهت ضخامت تغییر می‌کن أکثر

  در این مقاله، پاسخ دینامیکی تیر تیموشنکو با طول بینهایت تحت اثر بار متحرک نوسانی با استفاده از تئوری مرتبه اول برشی مطالعه می‌شود. تیر مورد نظر از جنس ماده مرکب ساخته شده و .روی بستر ویسکوالاستیک تعمیم یافته پسترنک قرار دارد. خصوصیات مکانیکی تیر در جهت ضخامت تغییر می‌کند ولی در جهت محور تیر ثابت فرض می‌شود. ابتدا با توجه به لایه‌گذاری ضربدری میدان جابجایی مناسب انتخاب می‌شود. سپس توسط اصل مینیمم کل انرژی پتانسیل معادلات دیفرانسیل حرکت استخراج گشته و با اعمال تبدیل فوریه مختلط نامتناهی حل می‌گردند. در این مطالعه، با استفاده از شبیه‌سازی عددی اثر پارامترهایی مختلف از قبیل سرعت بار متحرک، فرکانس بار متحرک، سفتی قائم بستر و ضریب ویسکوزیته بستر بر روی خیز تیر، نیروی برش و تنش برحسب فاصله از بار متحرک رسم شده است. نتایج نشان دادند که با افزایش سفتی قائم بستر، ضریب ویسکوزیته لایه برشی بستر و فرکانس بار متحرک باعث کاهش خیز، نیروی برش و تنش خمشی تیر می‌شود. همچنین، نتایج حاصل از تئوری مرتبه اول برشی با نتایج شبیه سازی عددی مقایسه شده و تطابق خوبی حاصل شده است. بنابراین شبیه سازی عددی می تواند پاسخ دینامیکی تیر کامپوزیت تحت بار متحرک را به خوبی بدست آورد. تفاصيل المقالة
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  5 - Static, dynamic and free vibration analysis of functional graded porous plates based on first-order shear deformation theory
  کامران عاصمی سعید خبری مسعود بابایی
  in this study, static, dynamic and natural frequency responses of the functionally graded saturated porous plate have been investigated. Two types of distributions including symmetric nonlinear distribution of porosity and asymmetric nonlinear distribution of porosity i أکثر

  in this study, static, dynamic and natural frequency responses of the functionally graded saturated porous plate have been investigated. Two types of distributions including symmetric nonlinear distribution of porosity and asymmetric nonlinear distribution of porosity in the thickness direction of the plate have been considered. First-order shear deformation theory (FSDT) and Lagrange method are used to model the problem. Finite element and Newmark direct integration methods are used to solve the governing motion equations in time and space domains, and then the effect of different parameters such as porosity and Skempton coefficients, and two different types of porosity distribution, length to thickness ratio and boundary conditions on static and time responses, and natural frequencies of functionally graded saturated porous plate have been investigated. Results show that by increasing the Skempton coefficient will always reduce the displacement and amplitude of vibration . Also, increasing the porosity coefficient will increase the displacement تفاصيل المقالة