Aerospace Materials and Structures Chair TU Delft

Aerospace Faculty (Luchtvaart- en Ruimtevaarttechniek-LR)

Vermelding onderdeel organization

October 8, 2009

1

R.N.NASUHOGLU

Outline

• Introduction

• Aerospace Faculty – TU Delft

• Aerospace Structural Group

• Thesis work : Design Guidelines for Non-conventional

October 8, 2009 2

• Thesis work : Design Guidelines for Non-conventional Panels

• Learn More!

Remziye Nimet NASUHOGLU

� graduated in 2007 at AE-METU

� currently Master Student in Aerospace

Who I am ☺☺☺☺

October 8, 2009 3

� currently Master Student in Aerospace Faculty of TUDelft

Introduction

TU Delft

October 8, 2009 4

78 in the top 200 world universities*

*source :Quacquarelli Symonds Ltd. , published October 9 2008.

Introduction

TU DelftDelft University of Technology has eight faculties:

� Architecture

� Civil engineering and Geosciences

� Electrical engineering, Mathematics and Computer Science

� Industrial Design Engineering

� Aerospace Engineering

October 8, 2009 5

� Aerospace Engineering

� Technology, Policy and Management

� Applied Science

� Mechanical, Materials and Maritime Engineering

Introduction

Aerospace Faculty

The MSc in Aerospace Engineering offers seven tracks;

� Aerodynamics

� Design, Integration and Operations of Aircrafts and Rotorcrafts

October 8, 2009 6

� Dynamics and Controls of Aerospace Vehicles

� Mechanics, Materials and Aerospace Structures� Aerospace Management and Operations

� Space Engineering

� Earth and Planetary Observation

Introduction

Aerospace Faculty

• SIMONA Facilities

• Cessna Citation II jet aircraft

•Wind tunnels

• Laboratory for Earth Oriented Space Research

October 8, 2009 7

Introduction

•Wind tunnels

• Structures and Materials Laboratory

Aerospace Faculty

CleanEra

October 8, 2009 8

Introduction

Aerospace Faculty

Superbus

October 8, 2009 9

Introduction

Delfly (Miniature airplane)

Aerospace Faculty

October 8, 2009 10

Introduction

Aerospace Structural Group

• Chair :Prof. dr. Zafer GÜRDAL

• 22 PhD

• 4 Researchers

• 9 Scientific Staff

October 8, 2009 11

• 9 Scientific Staff

• 3 Technical Staff

• 24 Master Students

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

October 8, 2009 12

structures, and

• increase the use of composite, hybrid, and activelyactuated smart materials in practical application forindustry.

Aerospace Structural Group

Research areas� Tailored structures� Adaptive and Smart Structures� Structural Optimization

October 8, 2009 13

� Stability and Vibrations of Shells� Thermal Loading of Structures� Inflatable Structures� Aircraft Crashworthiness

Research Areas

• Tailored Structures

The aim is to achieve the optimal stiffness and strengthdesign of structural components including the

October 8, 2009 14

design of structural components including thefabrication process.

� multi-level optimization

� layout optimization

Aerospace Structural Group

Research Areas

• Adaptive and Smart Structures

The tow main focuses is design and optimization ofactively sensed and actuated smart structural systems.

October 8, 2009 15

actively sensed and actuated smart structural systems.

Besides; novel concepts for multifunctional structuresand self-healing materials are being studied.

Aerospace Structural Group

Research Areas

• Structural Optimization

As optimal structures are generally unstable, analyticaltools are being developed to look at the complete

October 8, 2009 16

tools are being developed to look at the completepicture of all loading conditions.

� Finite Element Method

Aerospace Structural Group

Research Areas

• Stability and Vibrations of Shells

Collapse and vibration behavior of imperfection ofcomposite shells under combined loading is studied

October 8, 2009 17

composite shells under combined loading is studiedtheoretically, numerically, and experimentally.

Aerospace Structural Group

Research Areas

• Thermal Loading Structures

Researchers aim to achieve numerical (FEM) modelingof nonlinear transient thermo-mechanical behavior.

October 8, 2009 18

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

Research Areas

• Inflatable Structures

Mechanics of inflatable structural components arebeing studied.

October 8, 2009 19

being studied.

Aerospace Structural Group

Research Areas

• Aircraft Crashworthiness

Air vehicle designs are being developed in order toenhance their safety and survivability under crash

October 8, 2009 20

enhance their safety and survivability under crashconditions.

Aerospace Structural Group

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

October 8, 2009 21

constraints with other design rules such as 10% rule and plycontiguity requirements.”

Thesis Work

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:

October 8, 2009 22

• Issues Important for the Designer:• Mechanics of Composite Materials• Structural Analysis• Optimization• Manufacturing

Thesis Work

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.

October 8, 2009 23

Thesis Work

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.

October 8, 2009 24

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

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.

October 8, 2009 25

Thesis Work

Lamination Parameters

The in-plane and out-of-plane parameters as a function oforientation angle and coordinate of layers are as follows;

October 8, 2009 26

Thesis Work

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:

October 8, 2009 27

Thesis Work

Feasible Domain

� feasible domain for lamination parameters can be defined asfollows

October 8, 2009 28

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

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.

October 8, 2009 29

Strain Envelope

October 8, 2009 30

Strain Distribution

Learn more!

• Aerospace Engineering

• Master of Science Program

• Admission Requirements

• Application Procedure

October 8, 2009 32

• Application Procedure

• Tuition Fees & Expenses

• Visa & Immigration

• Scholarships & Grants

Questions?

Thank you !!

October 8, 2009 33