Sandwich panel

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1 - Numerical and Experimental Static Bending Analysis of Composite Sandwich Panels with Grid-Stiffened Cores Before and After Transverse Impact Loading
Ali Asghar Davoodabadi Ali Davar Mohsen Heydari Beni Jafar Eskandari Jam

10.30486/admt.2021.1904974.1208

Nowadays grid structures are considered as one of the most useful composites because of their various applications. Since grid structures are vulnerable to impact loads, they should be investigated under such loadings. The present paper studies the low-velocity impact l أکثر

Nowadays grid structures are considered as one of the most useful composites because of their various applications. Since grid structures are vulnerable to impact loads, they should be investigated under such loadings. The present paper studies the low-velocity impact loading of sandwich panels with grid-stiffened cores using both experimental and numerical simulations. In addition to the impact behaviour and the resultant damage of the sandwich panels, the behaviour of these structures under three-point bending was studied before and after the impact loading. The results were provided for impact and bending loadings separately. Then the effect of impact loadings on bending strength was investigated and it was found that the impact loading decreases the bending strength. A consistency between numerical and experimental results was also observed, which confirms the applicability of the Finite Element Method (FEM) in simulating the behaviour of such structures under impact and bending loads, while saving lots of time, efforts and costs. تفاصيل المقالة

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2 - Finite Element Analysis of the Impact Behavior of Sandwich Panels with Nanocomposite Face sheet (Epoxy/ Fiberglass/Nanosilica)
Arash Azadi Mahdi Karami Khorramabadi Maziar Mahdipour Jalilian

10.30486/admt.2023.1957517.1349

In this research, the impact behavior of nanocomposite sandwich panels with epoxy/fiberglass/nanosilica face sheet were assessed by the finite element method. In the first step, the mechanical properties of the nanoparticle-containing composite should be obtained. A uni أکثر

In this research, the impact behavior of nanocomposite sandwich panels with epoxy/fiberglass/nanosilica face sheet were assessed by the finite element method. In the first step, the mechanical properties of the nanoparticle-containing composite should be obtained. A unit cell of fabric was designed in Catia software and placed within the designed polymeric matrix. The mechanical properties of this unit cell were defined as a new matrix and the nanoparticles were randomly dispersed in the new matrix using a Python code. The elastic properties of the modeled nanocomposite were obtained using Abaqus software via applying periodic boundary conditions based on the mean volumetric stress. In the next step, the sandwich structure was subjected to impact loads at various speeds and contact force-time diagrams were plotted using Abaqus software. The modeled results were compared with the known experimental data which showed a high accuracy in predicting the mechanical properties and impact behavior of the nanocomposite sandwich structures. تفاصيل المقالة

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3 - Buckling and Thermomechanical Vibration Analysis of a Cylindrical Sandwich Panel with an Elastic Core Using Generalized Differential Quadrature Method
A.R Pourmoayed K Malekzadeh M Shahravi H Safarpour

10.22034/jsm.2019.665367

In this paper, the vibrational and buckling analysis of a cylindrical sandwich panel with an elastic core under thermo-mechanical loadings is investigated. The modeled cylindrical sandwich panel as well as its equations of motions and boundary conditions is derived by H أکثر

In this paper, the vibrational and buckling analysis of a cylindrical sandwich panel with an elastic core under thermo-mechanical loadings is investigated. The modeled cylindrical sandwich panel as well as its equations of motions and boundary conditions is derived by Hamilton’s principle and the first-order shear deformation theory (FSDT). For the first time in the present study, various boundary conditions is considered in the cylindrical sandwich panel with an elastic core. In order to obtain the temperature distribution in the cylindrical sandwich panel in the absence of a heat-generation source, temperature distribution is obtained by solving the steady-state heat-transfer equation. The accuracy of the presented model is verified using previous studies and the results obtained by the Navier analytical method. The novelty of the present study is considering thermo-mechanical loadings as well as satisfying various boundary conditions. The generalized differential quadrature method (GDQM) is applied to discretize the equations of motion. Then, some factors such as the influence of length-to-radius ratio, circumferential wave numbers, thermal loadings, and boundary conditions are examined on the dynamic and static behavior of the cylindrical sandwich panel. تفاصيل المقالة

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4 - Investigation of Oblique Blast Loading on Trapezoidal Corrugated Core Sandwich Panels; Experimental and Numerical Study
H Mohammadi Hooyeh A Naddaf Oskouei T Mirzababaie Mostofi Kh Vahedi

10.22034/jsm.2022.1958120.1741

In this work dynamic response of trapezoidal corrugated core sandwich panels subjected to oblique blast loading are studied both numerically and experimentally. The stand-off distance which has been determined from sandwich panel to center of the nearest face of the exp أکثر

In this work dynamic response of trapezoidal corrugated core sandwich panels subjected to oblique blast loading are studied both numerically and experimentally. The stand-off distance which has been determined from sandwich panel to center of the nearest face of the explosive cylinder is considered 300 mm. the experiments was performed at Four blast tube with different included angles of 0°, 15°, 30° and 45° respect to sandwich target plate. The results of numerical simulation, obtained using coupled Eulerian – Lagrangian (CEL) method at ABAQUS/Explicit software. Maximum mid- point deflection of back and front faces are compared with experiment results. The results show that with increasing angle of tilt of explosive the amount of back face deflection at angles of tilt 15°, 30° and 45° respect to the case of 0°, 4.68%, 5.86% and 9.77% decreases respectively. It is found that at the z direction, deformation profile is completely dome-shaped while the profile in the x direction is almost conical. The achieved results can be used to optimization designing of military vehicles and employed for civil infrastructure. تفاصيل المقالة

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5 - Static Bending Analysis of Foam Filled Orthogonally Rib-Stiffened Sandwich Panels: A Mathematical Model
S Soleimanian A Davar J Eskandari Jam M Heydari Beni

10.22034/jsm.2019.668614

The current study presents a mathematical modeling for sandwich panels with foam filled orthogonally rib-stiffened core using Heaviside distribution functions. The governing equations of the static problem have been derived based on classical lamination theory. The pres أکثر

The current study presents a mathematical modeling for sandwich panels with foam filled orthogonally rib-stiffened core using Heaviside distribution functions. The governing equations of the static problem have been derived based on classical lamination theory. The present model contains three displacement variables considering all of the stiffness coefficients. A closed form solution using Galerkin’s method is presented for simply supported sandwich panels with foam filled orthogonally rib-stiffened core subjected to uniform lateral static pressure. Compared to previous researches, the present work is comprehensive enough to be used for symmetric, unsymmetric, laminated or filament wound panels with orthogrid stiffeners. The accuracy of the solution is checked both through comparisons with previous works, and the results of simulation with ABAQUS software. تفاصيل المقالة

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6 - Numerical and Experimental Analysis of Impact and Damage on Composite Sandwich Panels with Grid-Stiffened Core
J Faraji Shoaa A Davar J Eskandari Jam M Heydari Beni

10.22034/jsm.2022.1926526.1688

A composite grid sandwich panel consists of a core with a composite grid structure and two faces on both sides of the core. This study investigated low-velocity impact in grid sandwich panels with grid cores experimentally and numerically by constructing and performing أکثر

A composite grid sandwich panel consists of a core with a composite grid structure and two faces on both sides of the core. This study investigated low-velocity impact in grid sandwich panels with grid cores experimentally and numerically by constructing and performing experimental tests using Abaqus finite element software. In the experimental part, three sandwich panels with grid cores were made for the low- velocity impact test. In the numerical part, three-dimensional elements were used, and damage was solved via programming in the Fortran language in Abaqus software. The results showed that the use of foam in the core of these structures reduced deflection due to impact despite a slight increase in the final weight of the structures. تفاصيل المقالة

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7 - Buckling and Free Vibrations of a Magneto-Electro-Elastic Sandwich Panel with Flexible Core
H Talebi Amanieh S.A Seyed Roknizadeh A Reza

10.22034/jsm.2020.1900703.1594

This paper presents the buckling and out-of-plane free vibration response of a sandwich panel with flexible core for the different boundary condition. In the desired configuration of the sandwich panel, the top and bottom plates are made of magneto-electro-elastic (MEE) أکثر

This paper presents the buckling and out-of-plane free vibration response of a sandwich panel with flexible core for the different boundary condition. In the desired configuration of the sandwich panel, the top and bottom plates are made of magneto-electro-elastic (MEE) plates. Moreover, the in-plane electric and magnetic potential fields are neglected for the derivation of the required relations. The sandwich structure is subjected to axial force in both longitudinal and transverse directions; in addition, and the top and bottom plates are exposed to electric and magnetic fields. The governing equations of motion for MEE sandwich panel with a flexible core are derived based on the first-order shear deformation theory by neglecting the displacement of the mid-plate and using the Hamilton’s principle. Furthermore, the derived partial differential equations (PDEs) are solved. According to the obtained numerical results, the core thickness, variation of electric field, variation of magnetic field and plate length are introduced as the most influential parameters on the free vibration response of the panel as well as the critical force of buckling. As one of the results, the electric potential is inversely related to the natural frequency and buckling load, so that with increasing the electric potential, the natural frequency and critical load of the structure is also increased.Moreover, the magnetic potential is directly related to the natural frequency and buckling load of the system, and increasing trends of natural frequency and critical load are observed by increasing the magnetic potential. تفاصيل المقالة

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8 - Wave Propagation in Sandwich Panel with Auxetic Core
D Qing-Tian Y Zhi-Chun

Auxetic cellular solids in the forms of honeycombs and foams have great potential in a diverse range of applications, including as core material in curved sandwich panel composite components, radome applications, directional pass band filters, adaptive and deployable st أکثر

Auxetic cellular solids in the forms of honeycombs and foams have great potential in a diverse range of applications, including as core material in curved sandwich panel composite components, radome applications, directional pass band filters, adaptive and deployable structures, filters and sieves, seat cushion material, energy absorption components, viscoelastic damping materials and fastening devices etc.In this paper, the characteristic of wave propagation in sandwich panel with auxetic core is analyzed. A three-layer sandwich panel is considered which is discretized in the thickness direction by using semi-analytical finite element method. Wave propagation equations are obtained through some algebraic manipulation and applying standard finite element assembling procedures. The mechanical properties of auxetic core can be described by the geometric parameters of the unit cell and mechanical properties of the virgin core material. The characteristics of wave propagation in sandwich panel with conventional hexagonal honeycomb core and re-entrant auxetic core are discussed, and effects of panel thickness, geometric properties of unit cell on dispersive curves are also discussed. Variations of Poisson’s ratio and core density with inclined angle are presented. تفاصيل المقالة

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9 - بررسی تاثیر جهت گیری هسته لانه زنبوری نسبت به صحفات جانبی بر قابلیت جذب انرژی پنل ساندویچی استفاده شده در چاله آسانسور
امیر قیاسوند حسین احمدی رشید سوان حسنی فرد

پنل های ساندویچی دارای قابلیت و توان بالا در زمینه جذب انرژی و مستهلک سازی انرژی جنبشی حاصل از برخورد در مواجهه با موج های انفجاری می باشند. در پژوهش حاضر تاثیر جهت گیری هسته لانه زنبوری پنل ساندویچی نسبت به صفحات جانبی و راستای بارگذاری بر قابلیت جذب و مستهلک سازی انرژ أکثر

پنل های ساندویچی دارای قابلیت و توان بالا در زمینه جذب انرژی و مستهلک سازی انرژی جنبشی حاصل از برخورد در مواجهه با موج های انفجاری می باشند. در پژوهش حاضر تاثیر جهت گیری هسته لانه زنبوری پنل ساندویچی نسبت به صفحات جانبی و راستای بارگذاری بر قابلیت جذب و مستهلک سازی انرژی ناشی از برخورد کابین آسانسور با پنل ساندویچی تعبیه شده در چاله آسانسور مورد بررسی قرار گرفته است. از شش زاویه 30, 20, 10, 5, 0 و 45 درجه بدین منظور استفاده گردید. مشاهده شد که با افزایش میزان زاویه جهت گیری هسته پنل نسبت به راستای ضربه میزان سختی پنل دچار افت خواهد شد و این افت با افزایش بیشتر زاویه جهت گیری هسته به صورت شدید تری اتفاق خواهد افتاد. با افزایش میزان زاویه هسته لانه زنبوری از حد بهینه، سازه به دلیل کرنش پلاستیک بزرگ فشردگی و مچالگی را تجربه خواهد نمود که این امر موجب افزایش شدید سختی پنل می گردد و پنل به دلیل عدم تراکم پذیری همانند یک جسم صلب عمل می نماید و قابلیت مستهلک سازی انرژی آن به شدت دچار کاهش می گردد. تفاصيل المقالة

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10 - Designing a prefabricated sandwich composite roofing system Made up of resisting facings and light-weight concrete core with truss-shaped connectors
Arash Totonchi Allah dad Ahmadi

In this paper, a new roofing system is introduced, which is constructued using the precast composite sandwich panels. This roofing sandwich panels system consists of three kinds of precast concrete sandwich panels including capital panels, beam or between columns panels أکثر

In this paper, a new roofing system is introduced, which is constructued using the precast composite sandwich panels. This roofing sandwich panels system consists of three kinds of precast concrete sandwich panels including capital panels, beam or between columns panels, and slab or middle panels. The panels are composed of three layers; A high strength reinforced concrete top layer. A thick layer of light-weight concrete as the intermediate layer or core. And a tensile resistant reinforced concrete bottom layer. The panels are connected together by special connectors at the edges.In this research, the influence of shear connector stiffness is studied which is measured according to their diameter on ultimate resistant and combined performance of the panels. The results of finite element analysis by ABAQUS software show a logical behavior of load-deflectioncurves in shear connectors. Based on the economic and weight comparisons the dead and live loads,the proposed sandwich panel roofing is approximately 44 percent lighter than the conventional steel joist and concrete blocks. This comparison shows the superiority of this roofing system to joists and concrete blocks system and seems to be a good alternative for it. Due to the possibility of prefabrication and industrial production of the panels under factory conditions, and various other technical, economic, and constructional advantages of this roofing system, it is concluded that it can be viable substitute for current roofing systems in low to high-rise buildings and can save a considerable amount of material, labor, time, and cost in building construction. تفاصيل المقالة

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11 - Flexural and Compressive Behaviour of M-shaped Core Sandwich Panel with Hybrid Carbon-Glass Fiber
Himan khaledi

In the present research, the flexural and compressive behavior of foam-filled sandwich panels M-shaped core with hybrid carbon-glass fiber composite have been experimentally investigated. In order to fabricate the sandwich panels, the vacuum assisted resin transfer mold أکثر

In the present research, the flexural and compressive behavior of foam-filled sandwich panels M-shaped core with hybrid carbon-glass fiber composite have been experimentally investigated. In order to fabricate the sandwich panels, the vacuum assisted resin transfer molding (VARTM) has been used to achieve a laminate without any fault. Afterward, polyurethane foam with density of 80 Kg/m3 has been injected into the core of the sandwich panel. The flexural and compressive properties of sandwich panel with hybrid carbon-glass fiber [CGCG]s have been compared to those of eight-layered carbon fiber [C]8 and the eight-layered glass fiber [G]8. The study of force-displacement curves obtained from the compressive and three-point bending tests showed that the [CGCG]s has larger elastic region than [C]8 and larger plastic region than [G]8. Also, it was found that polyurethane foam enhanced the ultimate compressive and bending loads and absorber features of sandwich panels Finally, the extra foam coming out of the sides of the sandwich panel is cut after rigidization. تفاصيل المقالة

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12 - Numerical Study of the Effect of Temperature Changes on the Failure ‎Behavior of Sandwich Panels with Honeycomb Core ‎
Ismaeil &lrm; Eynali Seyed Alireza Seyed Roknizadeh

In this paper, failure modes of sandwich panels are investigated numerically using finite element method. For this purpose, four sandwich beams of GFRP laminateskins and Nomex honeycomb core are considered. The models have been chosen so that they could cover all failur أکثر

In this paper, failure modes of sandwich panels are investigated numerically using finite element method. For this purpose, four sandwich beams of GFRP laminateskins and Nomex honeycomb core are considered. The models have been chosen so that they could cover all failure modes according to available experimental failure mode maps. Models are created and analyzed based on standard 3-points bending test, using ASTM standard C393-62. In order to investigate the effect of loading and sandwich panelparameters on failure behavior, finite element analysis has been utilized. The results are verified by comparing experimental and theoretical results. The constructed failure mode map shows dependence of failure mode on the ratio of skin thickness to span length, and honeycomb relative density. To Then, effect of temperature on the failure modes ofsandwich panels, has been investigated. Results show that failure modes haven’t depended on environment temperature and failure load decreases by increasing environmentaltemperature. The slope of reduction is a function of beam geometrical parameters.Depending on the parameters, the failure loads decrease between 10% to 40% byincreasing environmental temperature. تفاصيل المقالة

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13 - Experimental Investigation and Numerical Simulation of the Mechanical Behavior of a Novel Honeycomb Core Sandwich Panels Formed by Hydroforming Process
Javad Shahbazi karami Nazanin Kafaei Kavoshian Afshin Kazerooni Akbar Ghazi Mir Saeed

Sandwich panel with central core honeycomb aluminum as one of the main shielding structures because of their high strength-to-weight ratio and improved energy absorption capacity, has been attracted the attention of many researchers and practitioners in recent years. Th أکثر

Sandwich panel with central core honeycomb aluminum as one of the main shielding structures because of their high strength-to-weight ratio and improved energy absorption capacity, has been attracted the attention of many researchers and practitioners in recent years. This paper initiates and presents a new type of central core honeycomb formed by hydroforming process. The study is augmented by a numerical and experimental work on flexural behavior of sandwich panel structures made of aluminum alloy and different cores such as aluminum, polyurethane foams, PVC, silicone and carbon fiber. Firstly a numerical simulation by ABAQUS software was run, then prepared samples were tested and related force-displacement diagrams were depicted from results. Comparing the corresponding diagrams obtained from simulation with that of the results of experimental investigation, high flexural strength of the sandwich panels with proposed honeycomb core relative to a three-layer sheet as well as a very high flexural strength of suggested sandwich panel with honeycomb core filled with carbon fiber against other samples of honeycomb was observed. Finally, comparing the experimental results with numerical simulations indicates acceptable conformity. تفاصيل المقالة

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14 - بررسی عملکرد سقف‌های ساندویچ پانلی تحت بار انفجار به روش اجزاء محدود
ناصر احدی محمدعلی لطف الهی یقین

امروزه با گسترش حملات انفجاری به ساختمان ها در جهان، بررسی دقیق رفتار سازه ها تحت اثر بارهای انفجاری یک ضرورت محسوب می‌شود. انفجار واکنشی است که در آن نرخ سوختن مواد با سرعتی به مراتب بیشتر از سرعت صوت انجام می‌شود که در نتیجه آن، گرادیان دما و فشار بسیار بالا ایجاد شده أکثر

امروزه با گسترش حملات انفجاری به ساختمان ها در جهان، بررسی دقیق رفتار سازه ها تحت اثر بارهای انفجاری یک ضرورت محسوب می‌شود. انفجار واکنشی است که در آن نرخ سوختن مواد با سرعتی به مراتب بیشتر از سرعت صوت انجام می‌شود که در نتیجه آن، گرادیان دما و فشار بسیار بالا ایجاد شده و موج شوک بلافاصله تولید و با سرعت بسیار بالا منتشر می شود. در این تحقیق با توجه به اهمیت موضوع به بررسی رفتار سقف‌های ساندویچ پانلی تحت بارهای انفجاری کانوپ با استفاده از نرم افزار آباکوس 2016 پرداخته خواهد شد. بدین ترتیب که جهت اعتبار داشتن نتایج نمونه‌های عددی، در ابتدا به صحت سنجی نتایج یک نمونه از مقاله مرجع پرداخته و بعد از درستی نتایج، به مدل‌سازی نمونه‌های عددی به تعداد 6 مدل و استخراج نتایج در نرم افزار اکسل اقدام خواهد شد.. در این تحقیق نمونه‌های عددی شامل دو گروه سقف ساندویچ پانل فولادی بوده که در فاصله سخت کننده‌های داخلی با هم فرق دارند. هر دو گروه تحت بارهای انفجاری معادل 1 و2 و3 کیلوگرم TNT در فاصله 20 سانتی‌متری از مرکز سقف قرار گرفته و تاثیرات بار انفجاری بر روی توزیع تنش و جابجایی‌های ایجاد شده در نمونه‌ها را مورد بررسی قرار داده خواهد شد. مطابق انتظار با توجه به نمونه ها با ثابت بودن ماده منفجره و افزایش فاصله از سطح پانل میزان جابجایی و تنش های وارده به پانل کمتر شده و همچنین با ثابت ماندن فاصله ماده منفجره از روی سطح پانل و افزایش میزان ماده انفجاری، جابجایی و تنش وارده به پانل نیز افزایش یافته است. تفاصيل المقالة

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15 - Optimization of electronic boards equipped with the BGA package to improve the response in random vibration
میلاد شهسواری مسعود عسگری

In this paper deflection and free vibration of sandwich panel is studied. The core of Sandwich panels is made of hexagonal honeycomb and faces are made of two different materials of Carbon Fiber Reinforced Plastic and K-aryl/epoxy covering. The governing equations are d أکثر

In this paper deflection and free vibration of sandwich panel is studied. The core of Sandwich panels is made of hexagonal honeycomb and faces are made of two different materials of Carbon Fiber Reinforced Plastic and K-aryl/epoxy covering. The governing equations are deduced from the First order Sheer Deformation Theory (FSDT) and they are solved using Generalized Differential Quadrature Method (GDQM). The classical method in the references is used to verify the DQ method and to show that the applied GDQM method has a good results with compared to the references. Deflection of sandwich panel is investigated with two different load types. Finally natural frequency for the first 4 modes and the two different faces materials are calculated and the effect of various lengths to core thickness ratios and faces to honeycomb core thickness ratios are studied. Further, the effect of foundation stiffness coefficient on deflection and natural frequency are showed. تفاصيل المقالة

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