2-minute-2-slide quick-fire project introductions...giampaolo ariu project outline •alternative...
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2-Minute-2-Slide Quick-FireProject Introductions
Second and Third Year CDT Students
www.bris.ac.uk/composites
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• Giampaolo Ariu • Laura Beckett• Manu Mulakkal • Qing Ai• Jamie Hartley• Xun Wu• Evangelos Zympeloudis
Running Order
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www.bris.ac.uk/composites
Giampaolo Ariu
Ian Bond, Richard Trask, Carwyn Ward and Yusuf Mahadik
The Development of Embedded Vascular
Networks in FRP as Active/Passive Thermal
Management Tools for Cure Processing
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Giampaolo Ariu
Project Outline
• Alternative cure process for
thick FRPs.
• Time and cost efficiency.
• Exotherm and cure cycle
control.
Aims
Abaqus 2D temperature model.
Experimental
• Proof-of-concept demonstrator.
• Thermal monitoring in-mould silicone oil
(silicone oil through pultruded carbon fibre tube).
Numerical (ABAQUS)
• Heat transfer within in-mould silicone oil.
• Cure prediction of randomly distributedcomposite.
Experimental setup.
Side view
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Giampaolo Ariu
Results
Experimental• Ramp rates comparable with oven
(2 ˚C min-1; heat losses).
Numerical• Potential cure time reduction with higher
flow rates and provided temperature(2D simplification).
Detailed ModelExperimental
Setup Optimisation
Cure of ActualComposite Part
Siliconeflow rate[m3 s-1]
Tmax
model[˚C]
Tmax
setup [˚C]
4×10-7 29.45 47.55×10-7 29.85 47.97×10-7 30.45 46.8
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Hierarchical Complex Fibrous Architecture for Additive Layer
Manufacturing
www.bris.ac.uk/composites
Laura [email protected]
Wuge Briscoe, Richard Trask
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Laura Beckett
Background• Discontinuous fibrous reinforcement in natural materials
(e.g. bone) achieves excellent mechanical properties.
• Use zinc oxide (ZnO) nanorods to produce hierarchical glass fibres under mild reaction conditions.
Seed Growth
Gupta, H. S. et al. 2006
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Laura Beckett
Results
• Tuneable, repeatableZnOcoverage.
• No decrease in tensile strength compared with base fibre.
Future Work -investigate effect
of rods on interfacial properties.
Untreated 3x Seed 5x Seed0
200
400
600
800
Stre
ngth
(MPa
)
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Programmable Deployment of Origami Architectures
Manu Charles Mulakkal
www.bris.ac.uk/composites
Supervisors: Dr Richard Trask (ACCIS), Dr Annela Seddon (NSQI), Dr George Whittel (Chemistry) and Prof Ian Manners (Chemistry)
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Manu Charles Mulakkal
Inspiration
Mimosa paudica10 m deployable mast – NuSTAR 2Heart stent 1
1. Zhong You and Kaori Kuribayashi-Shigetomi2. Nuclear Spectroscopic Telescope Array3. Etienne Cliquet, Flotilla
Flotilla 3
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Manu Charles Mulakkal
Research findings
• Porosity• Surface free energy• Surfactant
concentration
• Temperature• Water retention• Hornification
Controlled by hydration and Hydrogen bonds
Towards Reversible Deployment
Paper fibres before and after polymer grafting
Above 320C
Using thermo-responsive polymers grafted via ATRP
Hydrophilic
Hydrophobic
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Qing Ai
Prof. Paul Weaver
Dr. Mahdi Azarpeyvand
www.bris.ac.uk/composites
Analytical model of a morphing trailing edge using variable stiffness materials
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Qing Ai, Modelling of a morphing TE
Morphing trailing edgeA novel morphing trailing edge is proposed for airfoil noise control purposes:• a composite upper skin• a silicone lower skin • a bending stiffness tailored core
Advantages of the novel morphing flap design:• reducing actuation requirement• enabling morphing profile tailoring• enhanced airfoil aerodynamic and noise
performance
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Qing Ai, Modelling of a morphing TE
Model
Model:a layer-wise sandwich beam model:
• tapered beam geometry• material stiffness variation in the core• three beam state variables• the Ritz method• the minimum total potential energy
principle
Future work:• Parametric studies and optimization design of the morphing trailing
edge• Demonstrator construction
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Crash Simulation of Tufted Sandwich Components for Automotive Applications
Jamie Hartley
James Kratz, Carwyn Ward and Ivana Partridge
www.bris.ac.uk/composites
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Jamie Hartley
Tufted Sandwich Panel
Automotive Composites
• Current Roadblocks:
– Cost
– Recyclability
– SAFETY
• Side impact a critical designcase.
• Need to be able to protectoccupants, and avoiddamage to battery.
• Tufted sandwich structuresare a potential solution tothis problem.
Euro NCAP Pole Impact Test
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Jamie Hartley
Test Coupon
15 mm
Test Section
Typical Splaying Failure Mode
5 mm
XP Project Work
• Aimed to understand behaviourof tufts within sandwichstructures.
• Edgewise Compression ofminiature, single tuft samples.
• Variation of tufting parametersand manufacturing results.
• Consistent experimental resultsvalidate process.
• No clear effect of varying tuftconditions at this stage.
1. Henao et al. (2010) Comp. Struct 92 2052-2059
Comparison of Stitching and Tufting processes [1]
STITCHING TUFTING
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Jamie Hartley
XP Project Work
• Aimed to understand behaviourof tufts within sandwichstructures.
• Edgewise Compression ofminiature, single tuft samples.
• Variation of tufting parametersand manufacturing results.
• Consistent experimental resultsvalidate process.
• No clear effect of varying tuftconditions at this stage.
1. Henao et al. (2010) Comp. Struct 92 2052-2059
Comparison of Stitching and Tufting processes [1]
STITCHING TUFTING
Displacement (mm)
Load (
N)
Test Section
Example Test Results
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www.bris.ac.uk/composites
Investigating the Feasibility of Through-
thickness Tufting with Discontinuous Carbon
Fibre Scraps
Xun Wu*
James Kratz, Carwyn Ward and Ivana Partridge
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Xun Wu
Introductions
• 40 – 60% scrap volume resulted from automotivemanufacturing.
• Incorporating through-thickness tufting with simplifiedoverlap layup.
• Resin infusion process + four point bending flexuraltesting.
Tufted Positions
0o
(a) Tufted on ply-drop overlap design
0o
Tufted Positions
(b) Tufted on half-tiled overlap design
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Xun Wu
Key Results
-2.7
4.0
-19.9
-11.7-9.0
4.4 5.4 0.2
36.742.0
-40
-30
-20
-10
0
10
20
30
40
50
Strength modulus Elastic strain Failure strain Energy
Absorption
Tuft
ed P
ropert
ies
change (
%)
Half-tile overlap
Ply-drop overlap
3000 me
1000 me
(a) Tufted ply-drop overlap design (b) Tufted half-tiled overlap design
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Automated High-Volume Production
of Complex Composite Parts: CMTS (Continuous Multi-Tow Shearing)
Evangelos Zympeloudis
Kevin Potter, Paul M. Weaver, B.C. Eric Kim
www.bris.ac.uk/composites
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Evangelos Zympeloudis
Continuous Multi-Tow Shearing (CMTS)
• Tow steering:
– Production of Variable Angle Tow Laminates.
– Lay-up in complex doubly curved moulds.
• CMTS:
– Material width does not affect steering capabilities.
– High production volumes and high shape complexity can beachieved.
[1] P.M. Weaver et al, Buckling Of Variable Angle Tow Plates: From Concept To Experiment
[2] B.C. Kim et al, Multi-Tow Shearing Mechanism For High-Speed Manufacturing of Variable Angle Tow Composites
[1]
[2]
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Evangelos Zympeloudis
Prototype Development
400 mm
Steering Radius: 200mmMax. shear angle: 30 deg
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2-Minute-2-Slide Quick-FireProject Introductions
Second and Third Year CDT Students
www.bris.ac.uk/composites