scholarly journals Bending Response of Composite Material Plates with Specific Properties, Case of a Typical FGM "Ceramic/Metal" in Thermal Environments

2018 ◽  
Author(s):  
Abdelrahmane Bekaddour Benyamina ◽  
Bachir Bouderba ◽  
Abdelkader Saoula
Keyword(s):  
Composite Material ◽  
Composite Structures ◽  
Structural Engineering ◽  
Rapid Development ◽  
Functionally Graded ◽  
Mechanical And Thermal Properties ◽  
Graded Materials ◽  
Thermal Environments ◽  
Shear Function ◽  
Electronic Chemical

The rapid development of composite materials and structures in recent years has attracted the increased attention of many engineers and researchers. These materials are widely used in aerospace, military, mechanical, nuclear, marine, optical, electronic, chemical, biomedical, energy sources, automotive fields, ship building and structural engineering industries. In conventional laminate composite structures, homogeneous elastic plate are bonded together to obtain improved mechanical and thermal properties. However, the abrupt change in material properties across the interface between the different materials can cause strong inter-laminar stresses leading to delamination, cracking, and other damage mechanisms at the interface between the layers. To remedy these defects, functionally graded materials (FGM) are used, in which the properties of materials vary constantly. The purpose of this paper is to analyze the thermomechanical bending behavior of functionally graded thick plates (FGM) made in ceramic/metal. This work presents a model that employed a new transverse shear function. The numerical results obtained by the present analysis are presented and compared with those available in the literature (classical, first-order, and other higher-order theories). It can be concluded that this theory is effective and simple for the static analysis of composite material plates with specific properties "Case of a typical FGM (ceramic/metal)" in thermal environments.

scholarly journals Optimal Design of Plated/Shell Structures under Flutter Constraints—A Literature Review

Materials ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4215 ◽  
Author(s):  
Aleksander Muc ◽  
Justyna Flis ◽  
Marcin Augustyn
Keyword(s):  
Composite Materials ◽  
Optimal Design ◽  
Composite Structures ◽  
Optimization Problems ◽  
Piezoelectric Actuators ◽  
Functionally Graded ◽  
Shell Structures ◽  
Objective Functions ◽  
Graded Materials ◽  
Definition Of

Aeroelastic optimization has become an indispensable component in the evaluation of divergence and flutter characteristics for plated/shell structures. The present paper intends to review the fundamental trends and dominant approaches in the optimal design of engineering constructions. A special attention is focused on the formulation of objective functions/functional and the definition of physical (material) variables, particularly in view of composite materials understood in the broader sense as not only multilayered laminates but also as sandwich structures, nanocomposites, functionally graded materials, and materials with piezoelectric actuators/sensors. Moreover, various original aspects of optimization problems of composite structures are demonstrated, discussed, and reviewed in depth.

scholarly journals Thermo-Elastic Analysis Of A Rotating Hollow Cylinder Made Of Arbitrary Functionally Graded Materials

2015 ◽  
Vol 45 (4) ◽  
pp. 41-60
Author(s):  
Mohammad Arefi ◽  
Iman Nahas ◽  
Majid Abedi
Keyword(s):  
Radial Displacement ◽  
Mechanical Analysis ◽  
Functionally Graded ◽  
Mechanical And Thermal Properties ◽  
Elastic Analysis ◽  
Graded Materials ◽  
Hollow Structures ◽  
Study Power ◽  
Rotating Hollow Cylinder

AbstractThermo-mechanical analysis of the functionally graded orthotropic rotating hollow structures, subjected to thermo-mechanical loadings is studied in this paper. The relations were derived for both plane strain and plane stress conditions as a cylinder and disk, respectively. Non homogeneity was considered arbitrary through thickness direction for all mechanical and thermal properties. The responses of the system including temperature distribution, radial displacement and radial and circumferential stresses were derived in the general state. As case study, power law gradation was assumed for functionally graded cylinder and the mentioned results were evaluated in terms of parameters of the system such as non-homogeneous index and angular velocity.

scholarly journals STUDY OF THE EFFECT OF COMPLEX-COMPOSITE STRUCTURES ON THE THERMAL CHARACTERISTICS OF THE POLYMER ADDITIVE MATERIALS

2019 ◽  
Vol 45 (4) ◽  
pp. 8-17
Author(s):  
N. V. Bekrenev ◽  
V. M. Makarova ◽  
S. P. Pavlov
Keyword(s):  
Thermal Conductivity ◽  
Composite Material ◽  
Carbon Fibers ◽  
Composite Structures ◽  
Complex Shape ◽  
Experimental Studies ◽  
Thermal Characteristics ◽  
Additive Technologies ◽  
Mechanical And Thermal Properties ◽  
Additive Materials

Objectives The use of additive technologies is one of the promising areas for improving the production of products for various purposes in the transition to a digital economy. Method. Layered construction of objects of complex shape in accordance with the developed solid-state model from materials with different mechanical and thermal properties allows directionally controlling the distribution of various components in the volume of the composite material and forming topological structures that provide a rational balance between various performance characteristics and reliability of the product. Result. Based on experimental studies, it has been established that reinforcing topological reinforcement of 3D printing objects made from ABS plastic with a composite consisting of carbon fibers and ED-20 epoxy resin, along with an increase in flexural strength and tensile strength, contributes to an increase in thermal conductivity of the material by more than 18% and thermal diffusivity - by 20%. A computer simulation of elementary cells of a composite material consisting of a polymer matrix, carbon fiber and special core inclusions with high thermal conductivity was performed, which made it possible to further increase thermal conductivity depending on the relative fiber diameter and the percentage of the additional component in an amount from 46 to 75%. Conclusion It is shown that additive technologies are an effective tool for creating universal topologies that allow technologically managing a combination of both mechanical and thermophysical properties of structural materials by determining the rational relative position of their components depending on the purpose and level of achievement of the required characteristics. 

Design of Functionally Graded Composite Structures for Control of Stress

2001 ◽  
Vol 702 ◽  
Author(s):  
Robert Lipton ◽  
Ani Velo
Keyword(s):  
Composite Materials ◽  
Numerical Method ◽  
Functionally Graded Materials ◽  
Composite Structures ◽  
Functionally Graded ◽  
Structural Components ◽  
Graded Materials ◽  
Functionally Graded Composite ◽  
Minimum Stress

ABSTRACTIn this paper a methodology is introduced for the design of structural components made from composite materials for the control of stress. A numerical method is developed for designing functionally graded materials with minimum stress in prescribed sub-domains inside the structure.

Al2O3 Preforms with Gradient Porosity for Brake Disk Application

2014 ◽  
Vol 91 ◽  
pp. 94-99
Author(s):  
Agata Strojny-Nedza ◽  
Katarzyna Pietrzak ◽  
Marcin Chmielewski ◽  
Katarzyna Jach
Keyword(s):  
Porous Alumina ◽  
Porous Ceramic ◽  
Functionally Graded ◽  
Rice Starch ◽  
Alumina Powder ◽  
Mechanical And Thermal Properties ◽  
Graded Materials ◽  
Pressure Infiltration ◽  
Manufacturing Procedure ◽  
Main Components

It has been known for many years that the incorporation of metallic particulates into a ceramic matrix can bring about the improvement of the mechanical properties of ceramics. Alumina/copper composites are well-known for their good frictional wear resistance, high resistance to thermal fatigue, high thermal conductivity as well as high absorption and dissipation of heat. The combination of the properties offered by alumina-copper composites makes them particularly interesting for wear applications in both automobile and aerospace industries. In the present paper we report on the design and production of a new class of alumina-copper functionally graded materials (FGM) which have technological potential for application in automotive brake disks. More specifically, this work deals with the development of the interpenetrating network structure of the FGM material. The manufacturing procedure was based on the gas-pressure infiltration of graded porous alumina preforms by liquid copper. The graded porous ceramic preforms with porosity ranging between 20 and 60% were made by casting foils made from slurries, the main components of which were alumina powder and rice starch powder (a pore forming agent), laminating these foils, subsequently burning-out the starch and last but not least performing a sintering process. A fundamental part of the presented investigations was to correlate the grain size of the alumina powders (Almatis, HVA FG and CT 1200 SG) and the pore size distribution, microstructure and selected mechanical and thermal properties of the porous ceramic preforms.

Design of Lightweight Graded Hot Structures for Hypersonic Vehicles

2012 ◽  
Vol 271-272 ◽  
pp. 838-841
Author(s):  
Qin Lu ◽  
Gui Qing Jiang ◽  
Xue Jun Zhang ◽  
Dai Ying Deng
Keyword(s):  
Thermal Protection ◽  
Thermal Environment ◽  
Thermal Response ◽  
Thermal Protection System ◽  
Functionally Graded ◽  
Protection System ◽  
Graded Materials ◽  
Thermal Environments ◽  
Long Time ◽  
Fundamental Equations

New-type hypersonic vehicle will encounter significant challenges due to severe heating environments during its long-time hypersonic flying in the atmosphere. Therefore, resusable, lightweight, high thermal resistance and anti-collision are demanded for Thermal Protection System. Traditional thermal protection system(TPS) can’t survive extreme thermal environments. In this paper, lightweight and integrated graded hot structures which composed of functionally graded materials (FGM) are addressed according to new thermal environment. It has been established nonlinear fundamental equations for hot structures. It is significant that gradation in material properties of hot structures allows the designer to tailor thermal response to meet variable thermal environment.

scholarly journals Postbuckling Behavior of Functionally Graded Multilayer Graphene Nanocomposite Plate under Mechanical and Thermal Loads on Elastic Foundations

2019 ◽  
Vol 35 (4) ◽  
Author(s):  
Pham Hong Cong ◽  
Nguyen Dinh Duc
Keyword(s):  
Composite Structures ◽  
Composite Plates ◽  
Weight Fraction ◽  
Functionally Graded ◽  
Multilayer Graphene ◽  
Thermal Environments ◽  
Reinforced Composite ◽  
Post Buckling ◽  
Plates And Shells ◽  
Graphene Nanocomposite

This paper presents an analytical approach to postbuckling behaviors of functionally graded multilayer nanocomposite plates reinforced by a low content of graphene platelets (GPLs) using the first order shear deformation theory, stress function and von Karman-type nonlinear kinematics and include the effect of an initial geometric imperfection. The weight fraction of GPL nano fillers is assumed to be constant in each individual GPL-reinforced composite (GPLRC). The modified Halpin-Tsai micromechanics model that takes into account the GPL geometry effect is adopted to estimate the effective Young’s modulus of GPLRC layers. The plate is assumed to resting on Pasternak foundation model and subjected to mechanical and thermal loads. The results show the influences of the GPL distribution pattern, weight fraction, geometry, elastic foundations, mechanical and temperature loads on the postbuckling behaviors of FG multilayer GPLRC plates. 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Duc, New approach to investigate nonlinear dynamic response and vibration of functionally graded multilayer graphene nanocomposite plate on viscoelastic Pasternak medium in thermal environment, Acta Mechanica 229 (2018) 651-3670. https://doi.org/ 10.1007/s00707-018-2178-3.[17] N.D. Duc, N.D. Lam, T.Q. Quan, P.M. Quang, N.V. Quyen, Nonlinear post-buckling and vibration of 2D penta-graphene composite plates, Acta Mechanica (2019), https://doi.org/10. 1007/s00707-019-02546-0.[18] N.D. Duc, P.T. Lam, N.V. Quyen, V.D. Quang, Nonlinear Dynamic Response and Vibration of 2D Penta-graphene Composite Plates Resting on Elastic Foundation in Thermal Environments, VNU Journal of Science: Mathematics-Physics 35(3) (2019) 13-29. https:// doi.org/10.25073/2588-1124/vnumap. 4371.[19] J.N. Reddy, Mechanics of laminated composite plates and shells; theory and analysis, Boca Raton: CRC Press, 2004.[20] H.S. 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