Mercan, Emrullah
This study investigates the stability of the graded fiber reinforcement composite plate under temperature-induced loads. The materials that make up the graded fiber reinforcement composite plate are fiber and matrix with different mechanical properties. Graduation is achieved by varying the volume fractions of the components across the thickness. The symmetric and unsymmetric ply sequences in the modeled composite plate are examined separately. Governing equations of motion and boundary conditions are obtained using Hamilton's principle. The displacement equations are obtained using Kirchhoff deformation theory. The system of equations written for the modeled case is solved numerically using the differential quadrature method. In order to validate the examined model, the studies in the literature and the models prepared in Abaqus are compared. Then, critical buckling temperature values for graded fiber reinforcement composite plate exposed to uniform temperature increase are found using MATLAB. According to the results obtained, the graduation in the thickness direction affects the thermal strength of the structure. The expected critical buckling temperature value increases as the plate is graded throughout the thickness.


Elastic Response of Heat Generating Rod at a Variable Generating Rate
Eraslan, Ahmet Nedim; Varlı, Ekin (2014-09-28)
The aim of this study is to develop a computational model to analyze thermally induced stress and deformation in a heat generating solid rod. The rod is initially at zero temperature, but for times greater than zero heat is generated internally at both space and time dependent rate. As the rod is heated up slowly an uncoupled solution is realized. The heat conduction equation with a variable generation rate is solved by a finite element collocation method. Two different generation rates are handled. The num...
Hyperbolic heat conduction based weight function method for thermal fracture of functionally graded hollow cylinders
Eshraghi, Iman; Soltani, Nasser; Dağ, Serkan (2018-08-01)
This article introduces a weight function method for fracture analysis of a circumferentially cracked functionally graded hollow cylinder subjected to thermal loads. The non-Fourier hyperbolic heat conduction model is used to determine the transient temperature distribution in the functionally graded cylinder. Solutions for transient temperature and stress distributions in the uncracked cylinder are derived by converting the governing differential equations into Fredholm integral equations in the Laplace do...
Laboratory investigation of hydraulic efficiency of transverse grates in roads
Özbey, Cumhur; Tiğrek, Şahnaz; Department of Civil Engineering (2015)
In this study, hydraulic efficiency of transverse grated inlet systems to be used in small roads is experimentally investigated. For this purpose, an existing experimental setup in the Hydromechanics Laboratory of METU is utilized. Three sets of experiments are conducted in order to examine the relationship between the total flow rate and the grate efficiency with respect to several parameters. In the first set, the interdependence of the void ratio and grate efficiency is investigated. In the second set of...
Lateral stiffness of steel plate shear wall systems
Topkaya, Cem (Elsevier BV, 2009-08-01)
The accuracy of the finite element method and strip method of analysis for calculating the lateral stiffness of steel plate shear wall (SPSW) systems is assessed by making comparisons with experimental findings. Comparisons revealed that while both methods provide acceptable accuracy, they also require the generation of sophisticated computer models. In this paper, two alternative methods are developed. The first one is an approximate hand method based on the deep beam theory. The classical deep beam theory...
Thermal effect on bending, buckling and free vibration of functionally graded rectangular micro-plates possessing a variable length scale parameter
Aghazadeh, Reza; Dağ, Serkan; Ciğeroğlu, Ender (2018-08-01)
Modified couple stress based model is presented to investigate statics, dynamics and stability of functionally graded micro-plates subjected to mechanical and thermal loadings. The features of FGM micro-plate including length scale parameter of modified couple stress theory assumed to be graded across the thickness by varying volume fractions of constituents. The governing equations of motion and boundary conditions are derived by means of Hamilton's principle. Displacement field is expressed in a unified w...
Citation Formats
E. Mercan, “THERMAL BUCKLING OF LAMINATED PLATES WITH VARIABLE FIBER VOLUME FRACTION,” M.S. - Master of Science, Middle East Technical University, 2023.