فهرس المقالات Laminates

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  1 - Isogeometric Analysis for Topology Optimisation of Two Dimensional Planar and Laminated Composite Plate Continuum Structures
  K.N.V Chandrasekhar V Bhikshma N Rakesh N Swapnareddy C Rakesh
  10.22034/jsm.2020.1910389.1645
  Isogeometric analysis is the recent development in the field of engineering analysis with high performance computing and greater precision. This current research has opened a new door in the field of structural optimisation. The main focus of this research study is to p أکثر

  Isogeometric analysis is the recent development in the field of engineering analysis with high performance computing and greater precision. This current research has opened a new door in the field of structural optimisation. The main focus of this research study is to perform topology optimisation of continuum structures in civil engineering using Isogeometric analysis. The continuum structures analysed here in this study are reinforced concrete, steel and laminated composite plates. Reinforced concrete is a rational union of concrete and steel. Topology optimisation of reinforced concrete structures is an emerging area of study to determine the optimal layout of material in the concrete domain. Laminated structures are made of several layers of material and bonded to achieve high stiffness and low weight to strength ratio. The deformed shape at the optimal state can be determined with topology optimisation of laminated composites. The formulation for composite plates is done using kirchoff thin plate theory without any shear contribution. B-splines are used to model the geometry. The objective is to optimise the energy of the structure and optimality criteria is used to calculate the newer values of relative densities. First order sensitivity analysis is performed to determine the newer values of objective function. The code is written in MatLab® and a few problems have been solved with different domains. The results are verified and have shown a good agreement with those in the literature. تفاصيل المقالة
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  2 - Measurement of Variation in Fracture Strength and Calculation of Stress Concentration Factor in Composite Laminates with Circular Hole
  A.R Ghasemi I Razavian
  In this research, residual strength and stress concentration factor of laminated composites with a circular open hole are studied analytically, numerically and experimentally. The numerical study was carried out using the finite element method. Moreover an analytical st أکثر

  In this research, residual strength and stress concentration factor of laminated composites with a circular open hole are studied analytically, numerically and experimentally. The numerical study was carried out using the finite element method. Moreover an analytical study was carried out with developing of point stress criterion. Mechanical testing was performed to determine the un-notched tensile properties and notched strength of composite laminates and characteristic length to reinforcement of the notched strength of composite laminates are determined. Results show that the influence of specimen dimension, notch size, lay ups and material properties are important on residual strength and stress concentration factor of laminated composite materials. تفاصيل المقالة
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  3 - Free Vibration Analysis of Variable Stiffness Composite Laminates with Flat and Folded Shapes
  B Daraei S Hatami
  In this article, free vibration analysis of variable stiffness composite laminate (VSCL) plates with flat and folded shapes is studied. In order to consider the concept of variable stiffness, in each layer of these composite laminated plates, the curvilinear fibers are أکثر

  In this article, free vibration analysis of variable stiffness composite laminate (VSCL) plates with flat and folded shapes is studied. In order to consider the concept of variable stiffness, in each layer of these composite laminated plates, the curvilinear fibers are used instead of straight fibers. The analysis is based on a semi-analytical finite strip method which follows classical laminated plate theory (CLPT). Natural frequencies obtained through this analysis for the flat plates are in good agreement with the results obtained through other methods. Finally, the effect of the fiber orientation angle, the folding order, crank angles and boundary conditions on the Natural frequencies is demonstrated. تفاصيل المقالة
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  4 - بررسی خستگی و ضرایب شدت تنش و رشد ترک در چندلایه های GLARE
  فرزاد امام علی زاده سید میثم حسینی محمد جعفر استاد احمد قرابی
  در این تحقیق به بررسی ضرایب شدت تنش و رشد ترک در چندلایه های هیبریدی از جنس GALRE و مورد استفاده در صنایع هوافضا پرداخته شده است. چندلایه GLARE، آلومینیوم های تقویت شده با لایه های کامپوزیتی از جنس شیشه/اپوکسی هستند. در این پژوهش ابتدا پس از ایجاد ترک با طولهای مختلف در أکثر

  در این تحقیق به بررسی ضرایب شدت تنش و رشد ترک در چندلایه های هیبریدی از جنس GALRE و مورد استفاده در صنایع هوافضا پرداخته شده است. چندلایه GLARE، آلومینیوم های تقویت شده با لایه های کامپوزیتی از جنس شیشه/اپوکسی هستند. در این پژوهش ابتدا پس از ایجاد ترک با طولهای مختلف در لایه های آلومینیوم، با استفاده از روش اجزای محدود به محاسبه ضرایب شدت تنش در لایه های آلومینیوم پرداخته شد. سپس با استفاده از رابطه پاریس رشد ترک چندلایه های هیبریدی مورد بررسی قرار گرفت. نتایج بدست آمده نشان می دهد که ضرایب شدت تنش در لایه های آلومینیوم مجزا، بسیار بیشتر از لایه های آلومینیوم موجود در چندلایه های هیبریدی است و در نتیجه رشد ترک در آنها سریعتر اتفاق می افتد. تفاصيل المقالة