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Aerospace Materials and Structures Chair TU Delft
Aerospace Faculty (Luchtvaart- en Ruimtevaarttechniek-LR)
Vermelding onderdeel organization
October 8, 2009
1
R.N.NASUHOGLU
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Outline
• Introduction
• Aerospace Faculty – TU Delft
• Aerospace Structural Group
• Thesis work : Design Guidelines for Non-conventional
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• Thesis work : Design Guidelines for Non-conventional Panels
• Learn More!
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Remziye Nimet NASUHOGLU
� graduated in 2007 at AE-METU
� currently Master Student in Aerospace
Who I am ☺☺☺☺
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� currently Master Student in Aerospace Faculty of TUDelft
Introduction
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TU Delft
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78 in the top 200 world universities*
*source :Quacquarelli Symonds Ltd. , published October 9 2008.
Introduction
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TU DelftDelft University of Technology has eight faculties:
� Architecture
� Civil engineering and Geosciences
� Electrical engineering, Mathematics and Computer Science
� Industrial Design Engineering
� Aerospace Engineering
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� Aerospace Engineering
� Technology, Policy and Management
� Applied Science
� Mechanical, Materials and Maritime Engineering
Introduction
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Aerospace Faculty
The MSc in Aerospace Engineering offers seven tracks;
� Aerodynamics
� Design, Integration and Operations of Aircrafts and Rotorcrafts
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� Dynamics and Controls of Aerospace Vehicles
� Mechanics, Materials and Aerospace Structures� Aerospace Management and Operations
� Space Engineering
� Earth and Planetary Observation
Introduction
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Aerospace Faculty
• SIMONA Facilities
• Cessna Citation II jet aircraft
•Wind tunnels
• Laboratory for Earth Oriented Space Research
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Introduction
•Wind tunnels
• Structures and Materials Laboratory
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Aerospace Faculty
CleanEra
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Introduction
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Aerospace Faculty
Superbus
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Introduction
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Delfly (Miniature airplane)
Aerospace Faculty
October 8, 2009 10
Introduction
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Aerospace Structural Group
• Chair :Prof. dr. Zafer GÜRDAL
• 22 PhD
• 4 Researchers
• 9 Scientific Staff
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• 9 Scientific Staff
• 3 Technical Staff
• 24 Master Students
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Aerospace Structural Group
• novel design and optimization methodologies, such asevolutionary algorithms and cellular automata,
• develop fast and efficient analysis and design tools forbuckling, post-buckling, and vibration characteristics ofstructures, and
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structures, and
• increase the use of composite, hybrid, and activelyactuated smart materials in practical application forindustry.
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Aerospace Structural Group
Research areas� Tailored structures� Adaptive and Smart Structures� Structural Optimization
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� Stability and Vibrations of Shells� Thermal Loading of Structures� Inflatable Structures� Aircraft Crashworthiness
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Research Areas
• Tailored Structures
The aim is to achieve the optimal stiffness and strengthdesign of structural components including the
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design of structural components including thefabrication process.
� multi-level optimization
� layout optimization
Aerospace Structural Group
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Research Areas
• Adaptive and Smart Structures
The tow main focuses is design and optimization ofactively sensed and actuated smart structural systems.
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actively sensed and actuated smart structural systems.
Besides; novel concepts for multifunctional structuresand self-healing materials are being studied.
Aerospace Structural Group
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Research Areas
• Structural Optimization
As optimal structures are generally unstable, analyticaltools are being developed to look at the complete
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tools are being developed to look at the completepicture of all loading conditions.
� Finite Element Method
Aerospace Structural Group
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Research Areas
• Stability and Vibrations of Shells
Collapse and vibration behavior of imperfection ofcomposite shells under combined loading is studied
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composite shells under combined loading is studiedtheoretically, numerically, and experimentally.
Aerospace Structural Group
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Research Areas
• Thermal Loading Structures
Researchers aim to achieve numerical (FEM) modelingof nonlinear transient thermo-mechanical behavior.
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of nonlinear transient thermo-mechanical behavior.
Also structural behavior of space re-entry structures,thermal projection systems and integrated hot-structures are being studied.
Aerospace Structural Group
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Research Areas
• Inflatable Structures
Mechanics of inflatable structural components arebeing studied.
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being studied.
Aerospace Structural Group
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Research Areas
• Aircraft Crashworthiness
Air vehicle designs are being developed in order toenhance their safety and survivability under crash
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enhance their safety and survivability under crashconditions.
Aerospace Structural Group
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Thesis Objective
• My thesis has the following objective ;
“Investigate if an analytical expression can be determined thatcorrelates with open hole strength test results for a variety oflaminates. Incorporate results in designs and analysis equationsand/or rules. Examine the interaction of open hole strengthconstraints with other design rules such as 10% rule and ply
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constraints with other design rules such as 10% rule and plycontiguity requirements.”
Thesis Work
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Composite Structures
• Design of Composite Structures:
Global and/or local tailoring of stiffness and strengthproperties through selective placement of fibers in a laminathat make up the composite laminate for an innovativestructural design concept that can be fabricated via costeffective manufacturing processes.
• Issues Important for the Designer:
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• Issues Important for the Designer:• Mechanics of Composite Materials• Structural Analysis• Optimization• Manufacturing
Thesis Work
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Composite
• A light weight structure concept demands new material withhigher specific stiffness (stiffness per weight).
• It gives the possibility to produce complex structure
• Engineers are able to design composite structure such thatthey can tailor composite properties.
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Thesis Work
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Tailoring composite properties
Tailoring can be done by ,
• changing structural dimensions like ply thickness and crosssectional area
• choice of orientation ,number and stacking sequence* oflayers.
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Thesis Work
layers.
*stacking sequence: The ply ordering in a laminate which becomescritical for flexural properties and the interlaminar stresses.[90/0/0/90] or [90/0]s
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Lamination Parameters
Lay-up information can be embodied in lamaination parameters.
�12 lamination parameters which are sufficent to express in-plane, coupling and bending stiffness of the laminate.
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Thesis Work
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Lamination Parameters
The in-plane and out-of-plane parameters as a function oforientation angle and coordinate of layers are as follows;
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Thesis Work
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Stiffness Matrices
These parameters are sufficient to find the in-plane andbending stiffness of a laminate, as laminate stiffness matricesare linear functions of lamination parameters:
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Thesis Work
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Feasible Domain
� feasible domain for lamination parameters can be defined asfollows
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Thesis Work
If the panel has constant stiffness, then only bending laminationparameters are necessary; since buckling response of thecomposite has only flexural stiffness dependency. However, for thecase of variable stiffness panels, in-plane stiffness matrix is alsorequired. Therefore, the feasible region for variable stiffnessdesigns has to be defined as the feasible region of combined in-plane and out-of-plane lamination parameters
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Thesis work
• In this thesis notched strength criteria for laminated fiberreinforced composite materials that can be applied based on thestiffness information of the laminate without detailed knowledgeof the stacking sequence is aimed to develop.
• So far, I did some failure investiagtion by using matlab. InJanuary I am going to compare those matlab results with someexperimental results done before.
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Strain Envelope
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Strain Distribution
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Learn more!
• Aerospace Engineering
• Master of Science Program
• Admission Requirements
• Application Procedure
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• Application Procedure
• Tuition Fees & Expenses
• Visa & Immigration
• Scholarships & Grants
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Questions?
Thank you !!
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