Mehmet Avcar

Mehmet Avcar
T.C. Süleyman Demirel Üniversitesi | SDU · Department of Civil Engineering

Doctor of Engineering

About

63
Publications
14,199
Reads
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980
Citations
Citations since 2017
32 Research Items
907 Citations
2017201820192020202120222023050100150200250300
2017201820192020202120222023050100150200250300
2017201820192020202120222023050100150200250300
2017201820192020202120222023050100150200250300

Publications

Publications (63)
Article
Full-text available
In this work, free vibration of non-homogeneous truncated conical shells on a Winkler foundation is studied. After formed the fundamental relations and governing equations, the dimensionless frequency parameter of the non-homogeneous isotropic truncated conical shell with or without an elastic foundation are found. Finally, effects of variations of...
Article
In this study, the stability of a generic three-layered truncated conical shell containing a functionally graded (FG) layer subjected to uniform external pressure is investigated. The material properties of the functionally graded layer are assumed to vary continuously through the thickness of the shell. The variation of the properties follows an a...
Article
Full-text available
In this study, the stability of cylindrical shells that composed of ceramic, FGM, and metal layers subjected to axial load and resting on Winkler-Pasternak foundations is investigated. Material properties of FGM layer are varied continuously in thickness direction according to a simple power distribution in terms of the ce-ramic and metal volume fr...
Article
In this study, the dynamic stability problem of a cylindrical shell composed of non-homogeneous orthotropic materials with Young’s moduli and density varying continuously in the thickness direction under the effect of an axial compressive load varying with a parabolic function of time is considered. At first, the fundamental relations and the modif...
Article
In this study, the stability analysis of functionally graded material (FGM) cylindrical, truncated and complete conical shells subjected to combined loads and resting on elastic foundations for two boundary conditions is investigated. The functionally graded material properties are assumed to vary continuously through the thickness of the conical s...
Article
Full-text available
Helicoidal laminates inspired by mantis shrimp crustacean can sustain higher loads compared to conventional laminated structures. However, there is still a lack of bending studies on the plates inspired by these helicoidal structures. The buckling and free vibration studies have been undertaken in the present work on the laminated composite and san...
Article
Lightweight lattice metamaterials can effectively enhance the impact resistance of thin-walled structures. With the aim of further investigating the potential of lattice-filled composite structures, an innovative nature-inspired functionally graded lattice filled protection structure (FGLPS) is proposed in this paper to enhance structural energy ab...
Article
For the first time, the present research examines the free vibration responses, Natural Frequencies (NFs), of Graphene Oxide Powder (GOP) nanocomposite cylindrical shells surrounded by three types of elastic foundations considering different Boundary Conditions (BCs). To support this, the effects of various BCs are examined on the NFs related to th...
Article
Full-text available
For static bending and free vibration analysis of functionally graded (FG) sandwich plates, a novel, enhanced first-order mixed plate element (IMQ4) is developed in this work. The transverse shear stresses are enhanced by assuming parabolic distribution shear stresses which satisfies the free condition of the transverse shear stresses on the upper...
Article
Full-text available
In this paper, a new C 0 four-node quadrilateral plate element (MiQ4) is proposed for the static bending analysis of functionally graded (FG) plates based on a C 0 higher-order shear deformation theory. By introducing a quadratic shape function for higher-order terms and a constant shear result, which is eliminated at the element level, the transve...
Article
Full-text available
Functionally graded materials are widely utilized in several industrial applications, and their accurate modeling is challenging for researchers, principally for FGM nanostructures. This study develops and presents a quasi-3D analytical plate theory to explore the bending behavior of a new model of FG plate structures (FGPSs), resting on modified f...
Article
The goal of the present research is to examine the Natural Frequencies (NFs) of perfect and imperfect Graphene Nanoplatelet Reinforced Nanocomposite (GNPRN) structures of revolution (conical and cylindrical shells and annular plate structures) resting on elastic foundations under general boundary conditions (BCs). The graphene nanoplatelet material...
Article
The present study examines the natural frequencies (NFs) of perfect/imperfect functionally graded sandwich beams (P/IP-FGSBs), which are composed of a porous core constructed of functionally graded materials (FGMs) and a homogenous isotropic metal and ceramic face sheets resting on elastic foundations. To accomplish this, the material properties of...
Article
The present research compares the influences of nanofiller materials on the free vibrational performance of Nanocomposite Cylindrical Shells (NCSs). For this purpose, three well-known nanofiller materials covering Carbon Nano Tubes (CNTs), Graphene Nano Platelets (GNPs), and Graphene Oxide Powders (GOPs) are implemented to improve polymer matrix an...
Article
Full-text available
This paper presents the free vibration and buckling analyses of functionally graded carbon nanotube-reinforced (FG-CNTR) laminated non-rectangular plates, i.e., quadrilateral and skew plates, using a four-nodded straight-sided transformation method. At first, the related equations of motion and buckling of quadrilateral plate have been given, and t...
Article
This investigation aims to determine the frequency responses associated with three-phase nanocomposite polymer-Graphene Oxide Powder (GOP)-carbon fiber spheroid and ellipsoid doubly-curved shells. In detail, the GOP nano-material is engaged to increase polymeric matrix mechanical features and form Crossbreed Matrix (CM) as well. For this reason, th...
Article
The present research analyzes the natural frequencies of the imperfect functionally graded sandwich plate (FGSP) comprised of porous face sheets made of functionally graded materials (FGMs) and an iso-tropic homogeneous core resting on the elastic foundation. To accomplish this, the material characteristics of the FGSP are taken to be changed inces...
Article
In the present work, an analytical solution for the free vibration of nanoplates made of functionally graded materials (FGMs) under various boundary conditions is provided. In this context, a new refined plate theory with four variables based on the theory of non-local elasticity including the small-scale influences is adopted. Using the rule of mi...
Article
The current study aims to analyze the natural frequencies of sigmoid functionally graded (FG) sandwich beams having various configurations employing high-order shear deformation theory. To do this, three diverse types of sandwich layup schemes have been constructed. The material characteristics of FG components of sandwich beams are presumed to var...
Article
Full-text available
In this research, the natural frequency responses of joined hemispherical–cylindrical–conical shells made of composite three-phase materials have been dealt with in the framework of First-Order Shear Deformation Theory (FOSDT). The joined hemispherical–cylindrical–conical shells are assumed to be made of hybrid porous nanocomposite material with th...
Article
Studies to increase prosthesis performance and service life in total hip prosthesis design have gained speed in recent years with the development of surgical methods, materials and production technologies. Practical structural and mechanical solutions that adapt to changing and evolving biomedical technology have become one of the main problems in...
Article
This paper presents a new nonlocal Hyperbolic Shear Deformation Beam Theory (HSDBT) for the free vibration of porous Functionally Graded (FG) nanobeams. A new displacement field containing integrals is proposed which involves only three variables. The present model incorporates the length scale parameter (nonlocal parameter) which can capture the s...
Article
Full-text available
In the present work, free vibration analysis of the square sandwich plate with functionally graded (FG) porous face sheets and isotropic homogenous core is performed under various boundary conditions. For this purpose, the material properties of the sandwich plate are supposed to vary continuously through the thickness direction according to the vo...
Article
In this study, the two-dimensional generalized finite integral transform(FIT) approach was extended for new accurate thermal buckling analysis of fully clamped orthotropic thin plates. Clamped-clamped beam functions, which can automatically satisfy boundary conditions of the plate and orthogonality as an integral kernel to construct generalized int...
Article
In engineering structures, to having the projected structure to serve all the engineering purposes, the theory to be used during the modeling stage is also of great importance. In the present work, an analytical solution of the free vibration of the beam composed of functionally graded materials (FGMs) is presented utilizing different beam theories...
Article
In this study, a two dimensional model of receding contact problem has been analyzed using finite element method (FEM) based software ANSYS and ABAQUS. For this aim finite element modeling of elastic layer and two homogeneous, isotropic and symmetrical elastic quarter planes pressed by means of a rigid circular punch has been presented. Mass forces...
Article
Full-text available
In this study, the contact problem of an elastic layer resting on the rigid foundation is examined. For this aim, two-dimensional analysis has been performed using Finite Element Method (FEM) based software called ANSYS. In the solution of the problem, the mass forces of the layers are neglected and the thickness through z-axis direction is taken a...
Article
In the present work, free vibration of beams made of imperfect functionally graded materials (FGMs) including porosities is investigated. Because of faults during process of manufacture, micro voids or porosities may arise in the FGMs, and this situation causes imperfection in the structure. Therefore, material properties of the beams are assumed t...
Article
The present study deals with the numerical analysis of the symmetric contact problem of two bonded layers resting on an elastic half plane compressed with a rigid punch. In this context, Finite Element Method (FEM) based software called ANSYS and ABAQUS are used. It is assumed that the elastic layers have different elastic constants and heights and...
Article
Full-text available
In the present study, a numerical model for wheel-snow interaction ispresented using finite element method. For this aim, the model of tire is designed using SolidWorks and ANSYS Design modeler. The analyses of the prepared models are performed using ANSYS Explicit Dynamics considering Mooney- Rivilin tire model. Frictional relationship between whe...
Article
In the present study, the free vibration of functionally graded beams resting on two parameter elastic foundation was examined. The properties of the functionally graded materials were presumed to vary continuously along the thickness direction. The foundation medium was assumed to be linear, homogeneous, and isotropic, and it was modeled by the Wi...
Article
Bu çalışmada, Winkler zemine oturan Fonksiyonel Derecelendirilmiş Malzemelerden (FDM) oluşan kirişin serbest titreşimi incelenmiştir. Malzeme özelliklerinin kiriş kalınlığı doğrultusunda sürekli olarak kuvvet kuralına göre değiştiği varsayılmıştır. Bernoulli-Euler kiriş teorisi çerçevesinde, Winkler zemine oturan FD kirişin serbest titreşiminin yön...
Article
In the present study free vibration of non-homogenous beam subjected to the axial force resting on elastic foundation has been examined. Non-homogeneity of the material is characterized considering the exponential variation of the Young's modulus along the thickness direction of the beam while the value of density is assumed to remain constant. The...
Article
In the present study, effects of material non-homogeneity and two-parameter elastic foundation on the funda- mental frequency parameters of the simply supported beams are examined. Material non-homogeneity is charac- terized taking into account the parabolic variations of Young’s modulus and density along the thickness direction of the beam while th...
Article
In the present study, separate and combined effects of rotary inertia, shear deformation and material non-homogeneity (MNH) on the values of natural frequencies of the simply supported beam are examined. MNH is characterized considering the parabolic variations of the Young's modulus and density along the thickness direction of the beam, while the...
Article
In this study, natural frequencies of the prismatical steel beams with various geometrical characteristics under the four different boundary conditions are determined using Artificial Neural Network (ANN) technique. In that way, an alternative efficient method is aimed to develop for the solution of the present problem, which provides avoiding loss...
Article
In this study, free vibration of square cross-sectioned aluminum beams is investigated analytically and numerically under four different boundary conditions: Clamped-Clamped (C-C), Clamped-Free (C-F), Clamped-Simply Supported (C-SS) and Simply Supported-Simply Supported (SS-SS). Analytical solution is carried out using Euler-Bernoulli beam theory a...
Article
In the present study elastic buckling of steel columns with three different cross sections, i.e. square, rectangle and circle cross sections, and two different boundary conditions, i.e. fixed-free(F-F) and pinned-pinned (P-P) boundary conditions, under axial compression has been investigated. At first, the basic equations of the problem have been g...
Article
In this study, the torsional stability problem of non-homogeneous orthotropic composite cylindrical shells in the elastic medium, using the Galerkin method was investigated. The Winkler model is used to describe the reaction of the elastic medium on the cylindrical shell. Mixed boundary conditions are considered. The eects of variations of shell pa...
Article
In this study, the stability analysis of three-layered shells containing a functionally graded material layer in the surrounding medium and subjected to the uniform lateral pressure is investigated. The surrounding elastic medium is modeled as a Pasternak foundation. The dimensionless critical lateral pressures of three-layered functionally graded...
Conference Paper
In this study, the stability analysis of three-layered shells containing a functionally graded material layer in the surrounding medium and subjected to the uniform lateral pressure is investigated. The surrounding elastic medium is modeled as a Pasternak foundation. The dimensionless critical lateral pressures of three-layered functionally graded...
Article
In this paper, free vibration of beams made of random and continuously non-homogenous materials with clamped edges and resting on an elastic foundation are investigated. First, the vibration equation of non-homogenous beams on the elastic foundation has been derived. Winkler type foundation model is used for foundation model. Applying Galerkin and...

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Projects

Projects (3)
Project
All Dear Colleagues – Collaborators and Their Laboratories are invited to attach to this project Their old, new and future works or messages about Stability of Structures, especially: buckling, wrinkling, crimpling, crumpling ... and their energy absorption as well as about dynamic stability, slope stability .. of axially and non-axially loaded structures like columns, tubes, pipes, beams, plates, boxes, tanks, silos, pales, poles, pillars, conical shells, thin-walled structures as well as nanostructures, foams, gels.. et cetera .. made of metals, wood, plywood, bamboo, bones, composite, laminate, glass, ceramic, gypsum, concrete, rock, brick .. et cetera .. If any RSGate Member wants to be added to the project as the Collaborator (at least a co/authorship of one work about the stability and following of 50 Members of the Project would be required), He needs to be a follower of a member of the project ... , sorry ... , but in another way, the system of the project doesn't recognize Him, and He can't be added ... Naturally, all Dear Colleagues–Collaborators are asked to add every Colleague, which works on the stability (at least the co/authorship of one work about the stability and following of 50 Members of the Project would be required) ... - and don't hesitate to invite them ... Dear Colleagues–Collaborators, I would like to thank You very much for Your current engagement in our Project, but let me allow to remind You what does mean "Collaboration" in the case of our Project, i.e.: 1. every Colleague–Collaborator of our Project should attach at least 1 work about "Stability of Structures" or a message about it, 2. every Colleague–Collaborator of our Project should follow each other (at least 50 Members of the Project), 3. every Colleague–Collaborator of our Project should read and recommend, if only would be so possibility regarding a scientific level of researches, all works with each other, 4. every Colleague–Collaborator of our Project should comment works to each other if only would be a reason to do that - comments naturally may be critical but with respect to authors, 5. every Colleague–Collaborator of our Project should cite each other - if only would be so possibility regarding research works of each one, i.e. in every new work attached to our Project should be cited a big number, e.g. 100 (a minimum number: 50) works of Collaborators of our Project, 6. every Colleague–Collaborator of our Project should collaborate and write common (with the Collaborators as co-authors) papers, books, ... and other kinds of works, if only would be so possibility, 7. if any Colleague–Collaborator of our Project has a possibility to help to publish works about "Stability of Structures" (e.g. as a member of a scientific journal or publishing house editorial board) should give massage about it in the "goal of the project" or in "updates" in our Project, 8. if any Colleague–Collaborator knows about a conference with "Stability of Structures" as a panel or topic - He should inform us in the "goal of the project" or in "updates" in our Project ... I hope that the above rules of our Project would help us to get success in our scientific work ... , every one of us would like that His work would be noted, read, recommended, commented, discussed, and cited ... , but somebody should do that ... Simultaneously I would like to note that renunciation of the rules of the Project, can be taken by other Collaborators as a kind of dishonesty, especially when a Collaborator would like to obtain a lot of "Reads", "Recommendations" and "Citations", but self doesn't take any so activity .
Archived project
All accepted papers will publish online in a volume of IOP Conference Series: Earth and Environmental Science (EES), indexed by Ei Compendex and Scopus. http://gem-conference.org/ https://iopscience.iop.org/issue/1755-1315/289/1 https://iopscience.iop.org/issue/1755-1315/442/1
Project
Vibration of Functionally Graded Beam-Column Resting on Winkler-Pasternak Foundations