A layerwise approach to modeling piezolaminated plates

Download

index.pdf

Date

2005

Author

Ertürk, Cevher Levent

Metadata

Show full item record

Item Usage Stats

189
views

148
downloads

In this thesis, optimal placement of adhesively bonded piezoelectric patches on laminated plates and the determination of geometry of the bonding area to maximize actuation effect are studied. A new finite element model, in which each layer is considered to be a separate plate, is developed. The adhesive layer is modeled as a distributed spring system. In this way, relative transverse normal and shear motion of the layers are allowed. Effect of delamination on the adhesive layer stresses is also studied and investigated through several case studies. Optimization problems, having single and multiple objectives, are investigated for both actuator placement and selective bonding examples. In these case studies, 2D and 3D Pareto fronts are also obtained. ءHide and Seek Simulated Annealing̕ method is adapted for discrete problems and used as the optimization technique for single-objective problems. Finally, Multiple Cooling Multi Objective Simulated Annealing optimization algorithm is adapted and used in multi-objective optimization case studies.

Subject Keywords

Aeronautics.

URI

http://etd.lib.metu.edu.tr/upload/12606340/index.pdf
https://hdl.handle.net/11511/15287

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Evaluation of a new turbulence model for boundary layer flows with pressure gradient Marangoz, Alp; Çıray, Cahit; Department of Aerospace Engineering (2005) In this thesis, a new turbulence model developed previously for channel and flat plate flows is evaluated for flat plate flows with pressure gradient. For this purpose a flow solver, which uses boundary layer equations as the governing equations and Von Karman momentum integral equation for the calculation of skin friction, is developed. It is shown that the error of the new turbulence model, in predicting the velocity profile, is less than 5 % for the flat plate flows without pressure gradient and less tha...
Parallel navier stokes solutions of low aspect ratio rectangular flat wings in compressible flow Durmuş, Gökhan; Eyi, Sinan; Department of Aeronautical Engineering (2004) The objective of this thesis is to accomplish the three dimensional parallel thin-layer Navier-Stokes solutions for low aspect ratio rectangular flat wings in compressible flow. Two block parallel Navier Stokes solutions of an aspect ratio 1.0 flat plate with sharp edges are obtained at different Mach numbers and angles of attack. Reynolds numbers are of the order of 1.0E5-3.0E5. Two different grid configurations, the coarse and the fine grids, are applied in order to speed up convergence. In coarse grid co...
Three-dimensional design and analysis of a compressor rotor blade Özgür, Cumhur; Akmandor, İbrahim Sinan; Department of Aerospace Engineering (2005) Three-dimensional design and three-dimensional CFD analysis of a compressor rotor stage are performed. The design methodology followed is based on a mean line analysis and a radial equilibrium phase. The radial equilibrium is established at a selected number of radii. NACA 65 series airfoils are selected and stacked according to the experimental data available. The CFD methodology applied is based on a three-dimensional, finite difference, compressible flow Euler solver that includes the source terms belong...
The effect of strain rate and temperature on forming limit diagram for DKP-6112 and AZ31 materials Goksen, Seckin; Darendeliler, Haluk (2020-01-01) Forming limit diagrams (FLDs) are used in sheet metal operations widely for predicting blank fracture and forming characteristics of materials. There are three approaches for building forming limit diagrams which are the experimental, theoretical and numerical methods. Experimental method, which includes Nakazima formability test, is generally preferred for determining forming limit diagrams, although it requires complex experimental setup and effort. This study, firstly, compares the experimentally determi...
Two dimensional finite volume weighted essentially non-oscillatory euler schemes with different flux algorithms Aktürk, Ali; Akmandor, İbrahim Sinan; Department of Aerospace Engineering (2005) The purpose of this thesis is to implement Finite Volume Weighted Essentially Non-Oscillatory (FV-WENO) scheme to solution of one and two-dimensional discretised Euler equations with different flux algorithms. The effects of the different fluxes on the solution have been tested and discussed. Beside, the effect of the grid on these fluxes has been investigated. Weighted Essentially Non-Oscillatory (WENO) schemes are high order accurate schemes designed for problems with piecewise smooth solutions that invol...

Citation Formats

C. L. Ertürk, “A layerwise approach to modeling piezolaminated plates,” Ph.D. - Doctoral Program, Middle East Technical University, 2005.