research topics in composite materials @ ita · 1 instituto tecnológico de aeronáutica prof....

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Instituto Tecnológico de Aeronáutica

Prof. Maurício Vicente Donadon

Instituto Tecnológico de AeronáuticaDepartment of Aeronautics

Research Topics in Composite Materials @ ITA

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Research Areas

Manufacturing Processes

Mechanical & Physical

Characterization

Simulation in Composites Nanocomposites Smart Composites

Experimental Techniques RecyclingWind Turbines

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COMPOSITE MATERIALS-RESEARCH TOPICSManufacturing processes

RTM RIFT

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COMPOSITE MATERIALS-RESEARCH TOPICSManufacturing processes

RIFT/RTM PROCESSESCLEAN ROOM ISO 10000

Resin infusion stacking

Mould filling simulation

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COMPOSITE MATERIALS-RESEARCH TOPICSMechanical & Physical Characterization

In-plane ply properties

Fracture Toughness Characterization

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COMPOSITE MATERIALS-RESEARCH TOPICSSimulation in Composites

Intralaminar failure modes Interlaminar failure (Delamination)

Fatigue induced damage

GI/GIc

Da/

DN

(mm

/cyc

le)

0.2 0.3 0.4

10-6

10-5

10-4

10-3

ExperimentalNumerical

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Life prediction/Durability

maxF

minF

F

maxF

minF

F

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COMPOSITE MATERIALS-RESEARCH TOPICSSimulation in CompositesMicromechanics - Asymptotic Homogenization

Fibre +

Matrix +

Interface Properties

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LV Impact Induced Damage CAI Strength Prediction

Bird-Strike

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Buckling, Postbuckling & Collapse (Fiber-Metal Laminates)

Experiment FE Prediction

Ballistic Impact Dynamics

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Ballistic Impact Dynamics


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Topological and Parametric Optimization of Stiffened Composite Panels for Aeronautical Applications

Laminate with N layersm possible orientation angles: 1, 2, …, m

Each ply k may assume m values for k

A laminate is defined by 0 = {10 20 … N0} and its lamination parameters 0For another laminate one has = {1

A 2A … 3

D 4D 5

A 6A}

Objective function f = f()

T

AADDAA

ffffff

654321

s

)()()(~00 ξξsξξ Tff

)( 0ξξs Tf Maximizef with restricted to lie in the feasible region.Searching all the mN possibilities is not doable

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Topological and Parametric Optimization of Stiffened Composite Panels for Aeronautical Applications

Ns0

Nx0

x

y

z

clamped

laminate 1

laminate 2

Nxy0

Nx0

Ny0y

z

w = 1.5 m

l = 1 m

hs = 0.1 m

wb = 0.1 mNx0

Ns0

clamped edge

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Structural synthesis for prescribed frequencies and mode shapes

• The need to advance in algorithms to deal with target mode shapes in the optimization process. • This inverse problem is of great interest for the synthesis under aeroelastic constraints or model

updating algorithms (based on modal test data).• Proposed method (without eigenvector derivatives) is under study for the joined wing aircraft.

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Simulation in CompositesAero acoustic scattering by finite composite plates

COMPOSITE MATERIALS-RESEARCH TOPICS

Sound source

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COMPOSITE MATERIALS-RESEARCH TOPICSNanocomposites

RTM Setup for Nanostructured composite manufacturing

CVD reactor @ INPE

CNT growth on the fabric surface

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COMPOSITE MATERIALS-RESEARCH TOPICSSmart Composites

Piezoelectric & Viscoelastic materials applied to natural

frequencies, buckling load and flutter control

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COMPOSITE MATERIALS-RESEARCH TOPICSWind Turbines

• Development of numerical tools for steady & unsteady aerodynamic/aeroelastic analyses of wind turbines;

• Blade design optimization

Vibration

Buckling

Progressive failure

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COMPOSITE MATERIALS-RESEARCH TOPICSWind Turbines

• Development & validation of similarity rules for wind tunel testing

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COMPOSITE MATERIALS-RESEARCH TOPICSExperimental Techniques

Combined Shear-Bending Post-buckling Post-buckling due to shear loading

Post-buckling/Crippling in compression

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Drop test tower – Impact tests

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Split Hopkinson Pressure Bar testing apparatus – Strain rate effects/HVI

•Incident/transmitted bars dimensions: 2m, Ф1”.

•Striker : 0,3m , Ф1”. Aluminum Pulse shaper used;

•Bar material : Carbon Steel /Aluminum alloy 7075T651

•Specimen dimensions ( b x h x L) : 15mm x 10mm x 10mm


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HVI/Ballistic impact setup – Gas-gun


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CAI test rig for plates & shells


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Aging & Environmental Effects


DCB at -54 0CTemp./Humidity & Thermal Shock Chambers

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COMPOSITE MATERIALS-RESEARCH TOPICSComposites Recycling

Schematic diagram of the pyrolysis reactor

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COMPOSITE MATERIALSResearch Collaboration Topics

1) Topological and Parametric Optimization of Stiffened Composite Panels for Aeronautical Applications;

2) Co-cured, co-bonded and secondary bonding composite joints;

3) Repair of Aeronautical Composite Structures;

4) Hygro-Thermo-Mechanical Fatigue of Composite Structures;

5) Impact resistance and damage tolerance of aeronautical composite panels;

6) Buckling, post-buckling and collapse of composite stiffened panels (static & dynamic (crushing))

7) Smart materials applied to aeroelasticity of composite panels (passive/active)

8) Progressive failure analysis of composite structures (multi-scale modeling)

9) Sustainable recycling processes applied to aeronautical composite structures

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COMPOSITE MATERIALSResearch Collaboration Topics

10) Sandwich structures:

Local & Global Buckling;

Static & Dynamic Responses;

Uncertainties quantification & validation;

Fatigue.

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THANK YOU

Questions?

www.lnca.ita.br

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research topics in composite materials @ ita · 1 instituto tecnológico de aeronáutica prof....

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