08 Maria Odila Cioffi Workshop Estruturas Leves 20Mai2014

8/11/2019 08 Maria Odila Cioffi Workshop Estruturas Leves 20Mai2014

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Process and Charac ter izat ionof Composi te by RTM

Maria Odila Hilário [email protected]

Fatigue and Aeronautic Materials Research Group


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18 Researchers

21 Students

1 Technician


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Project

General Objecti ves :

– Development of anexperimentalmethodology toproduce aeronautical

components by resintransfer moldingprocess;

– Substitution of Al7050-T7451 alloy by non-

crimp fabric(NCF)/epoxy system(RTM6) composites;


EMBRAER Landing Gear

HYDRAULIC

CYLINDERS

SHOCK

ABSORBER

SHAFT

STALK


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Project








HYDRAULIC

CYLINDERS

SHOCK

ABSORBER

SHAFT

STALK


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Project








HYDRAULIC

CYLINDERS

SHOCK

ABSORBER

SHAFT

STALK

Properties

Materials

A l 7050-T7451 NC2/RTM6

Elast ic Modu lus 65 GPa 60 GPa

Yield Strength 429 MPa 530 MPa

Ult imate Tensi le Strength 502 MPa 665 MPa

Elongat ion 10 % 2 %


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Project








HYDRAULIC

CYLINDERS

SHOCK

ABSORBER

SHAFT

STALK

Properties

Materials

A l 7050-T7451 NC2/RTM6

Elast ic Modu lus 65 GPa 60 GPa

Yield Strength 429 MPa 530 MPa

Ult imate Tensi le Strength 502 MPa 665 MPa

Elongat ion 10 % 2 %

Materials change will provide a reduction

of 59% weight for the component.


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400

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460

480

500

10000 100000 1000000

Delamination

Rupture

N (cycles)

S t r e s s ( M P a )

Fatigue Tests

SxN Curve. NC2/RTM6Composite.

Results


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400

420

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460

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500

10000 100000 1000000

Delamination

Rupture

N (cycles)

S t r e s s ( M P a )

Fatigue Tests

SxN Curve. NC2/RTM6Composite.

Results

hackles

cusps


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Process

Matrix• Toughness

• Kinetic Study

Reinforcement

• Stitching• Drapability

• Permeability

Process

• Process Parameters influence• Cure cycle

Composites

• Acoustic inspection Microscopy


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Matrix Toughness :

Impregnation Map of NCF/RTM6composite

3-D construction C-scan Map:

NCF/RTM6 composite


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Matrix Toughness :

Impregnation Map of NCF/RTM6composite

3-D construction C-scan Map:

NCF/RTM6 composite


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Toughness :

Matrix

HPBA polymer was more

efficient due to molecule

higher free volume and

suitable physical interaction

with epoxy system

Sea-island


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Matrix • Kinetic reaction – Prism EP2400

Dynamic DSC for 2, 5 e 10°C Isothermal coversion Curve

• Dynamic DSC for different heating rates;

• Simulation of isothermals by isoconversional method;

• The difference between the theoretic and experimental method is associated

by autocatalytic and n order kinetic reactions


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Matrix • kinetic study – Prism EP2400

Experimental curves of rate and isothermal

conversion at 170, 175 e 180ºC.

Time function fitting experimental curve

• Conversion rates by DSC – autocatalytic model until 50 min for Tcura.

•

As the cure progress – n order model .


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Sti tching

Tricot Stitching

Chain Stitching

• Stitching influence

•Chain showed a fatigue behavior more uniforme due to the homogeneous stitching

•Higher fatigue behavior was observed when the stitching was tricot but with

premature delaminatin process


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Sti tching

Tricot Stitching

Chain Stitching

• Stitching influence

•Chain showed a fatigue behavior more uniforme due to the homogeneous stitching

•Higher fatigue behavior was observed when the stitching was tricot but with

premature delaminatin process


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Reinforcement • Drapability


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Permeability : exper imental X Simu lat ion

Reinforcement

It was also observed the race tracking phenomena for both model and

experimental


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The same resin front behavior was observed for both until 2/3 fabric

length.

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Reinforcement


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From this point the fluid become different.

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Reinforcement


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Reinforcement

At the end of the fabric length the front is equal again.

The simulation and the mesh model are suitable


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Total time of injection t = 2342 s (model 4747 elements).Permeability study → t = 1137 s.

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Reinforcement


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RTM Process

FAPESP processo número 2006/02121-6 - JP


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Process RTM Process parameter influence:

Temperature:

Enough to reduce the resin viscosity in order to promote high

volume fiber impregnation;

High Viscosity produce fiber misalignment.

Pressure:

Enough to improve the impregnation (1.5 – 4.0 bar);

Excessive pressure produce fiber misalignment.

Fiber volume fraction:

Constant throughout the laminate in order to avoid preferential

resin path, which cause dry spots.


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RTM Process Cure cycle :

Set by kinetic study ;

low temperature rate improves the fabric impregnation;

longer periods of low viscosity resin within the first 25 min 50 mPa.s


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Composi te Procedure for acoustic microscopy inspection - MIScan

• Ultrasonic inspection

• A-scan and C-scan method

• Transducer 10 MHz probe

• Pulse-echo mode

Equipment Model PSS-600, MUIS32 manufactured by MATEC

A-scan graphic aided to calibrate the patterns of typical composite peaks


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• Pulse-echo mode



INJEÇÃO

a)

INJEÇÃO

b)


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• Pulse-echo mode



INJEÇÃO

a)

INJEÇÃO

b)

a)


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Developments

AdvancedComposites

Crack propagation in 5HS carbon/epoxy composites

Interlaminar Fracture Toughness Study

Structural composite fatigue life prediction considering

DMA results

Naturalcomposite

Thermoplastics composites obtained by injection

Thermossseting composites by RTM process

Nanobiodegradable composites by electrospinning

Composites development to historic edification application

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Research

http://localhost/var/www/apps/conversion/tmp/scratch_3/Projeto%20de%20doutorado%20marco.pptxhttp://localhost/var/www/apps/conversion/tmp/scratch_3/apresenta%C3%A7%C3%A3o%20trabalho%20midori.pptxhttp://localhost/var/www/apps/conversion/tmp/scratch_3/thati.pptxhttp://localhost/var/www/apps/conversion/tmp/scratch_3/Apresenta%C3%A7%C3%A3o_Kelly%20-%20thermoplastic.pptxhttp://localhost/var/www/apps/conversion/tmp/scratch_3/Apresenta%C3%A7%C3%A3o_Kelly%20-%20thermosetting%20composite.pptxhttp://localhost/var/www/apps/conversion/tmp/scratch_3/Apresenta%C3%A7%C3%A3o_Kelly%20-%20spinning.pptxhttp://localhost/var/www/apps/conversion/tmp/scratch_3/apresenta%C3%A7%C3%A3o%20trabalho%20andressa.pptxhttp://localhost/var/www/apps/conversion/tmp/scratch_3/apresenta%C3%A7%C3%A3o%20trabalho%20andressa.pptxhttp://localhost/var/www/apps/conversion/tmp/scratch_3/Apresenta%C3%A7%C3%A3o_Kelly%20-%20spinning.pptxhttp://localhost/var/www/apps/conversion/tmp/scratch_3/Apresenta%C3%A7%C3%A3o_Kelly%20-%20thermosetting%20composite.pptxhttp://localhost/var/www/apps/conversion/tmp/scratch_3/Apresenta%C3%A7%C3%A3o_Kelly%20-%20thermoplastic.pptxhttp://localhost/var/www/apps/conversion/tmp/scratch_3/thati.pptxhttp://localhost/var/www/apps/conversion/tmp/scratch_3/apresenta%C3%A7%C3%A3o%20trabalho%20midori.pptxhttp://localhost/var/www/apps/conversion/tmp/scratch_3/Projeto%20de%20doutorado%20marco.pptx


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RTM linked projects

Projects


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Projetos

Aquisição dos seguintes equipamentos:

Injetora Radius 2100cc RTM

Molde fechado em aço

Sistema de aquecimento via resistências elétricas

Bomba de vácuo

Microscópio de varredura acústica (MIScan)

Estufa a vácuo, agitadores e balança analítica

CNPq n° 472570/2006-4

FAPESP nº 2006/02121-6


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Projetos

Figura XX: Sistema de processamento de compósitos por RTM locado no DMT/FEG/UNESP


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Projetos

Figura XX: Detalhes do molde em aço usando no processamento via RTM


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Projetos

Figura XX: : Equipamento de ultrassom por imersão em água locado no DMT/FEG/UNESP


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Projetos


Porosímetro Automático de Mercúrio, modelo Poremaster 33 GT(Quantachrome Instruments)

Descrição: Realiza medições de tamanho de poros de distribuição emduas amostras de geração de pressão contínua ou gradual de vácuo

para 33.000 psi.

CNPq n° 483308/2010-2 Titulo do Projeto: PROCESSAMENTO DE COMPÓSITOS VIA RTM:CONTROLE DE VAZIOS POR DIFERENTES METODOLOGIAS


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Projetos

Figura XX: Porosímetro Automático de Mercúrio locado no DMT/FEG/UNESP


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Projetos


Analisador de Densidade Real, Modelo UltraFoam 1200e(Quantachrome Instruments)

Descrição: Determina o volume real/densidade de sólidos.



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Projetos

Figura XX: Analisador de Densidade Real locado no DMT/FEG/UNESP


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Projetos


Cortadeira Metalográfica TechCut-5 (Allied High Tech Products)

Descrição: Cortadeira metalográfica com avanço automático.



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Projetos

Figura XX: Cortadeira metalográfica locada no DMT/FEG/UNESP


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Projetos

Aquisição do seguinte equipamento:Equipamento de Calorimetria Exploratória Diferencial (DSC) comcompensação de potência, modelo DSC 8000 (PerkinElmer)

Descrição: Esse equipamento tem a capacidade de operar em uma

faixa de temperatura de trabalho de -180ºC até 750ºC com taxas deaquecimento e resfriamento de 1 a 750ºC/min.

CNPq n° 486083/2012-8Titulo do Projeto: PROCESSAMENTO DE COMPÓSITOS VIA RTM:

CARACTERIZAÇÃO TÉRMICA


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Projetos

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08 Maria Odila Cioffi Workshop Estruturas Leves 20Mai2014

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