仿生复合材料-自愈合

For Improved Performance

Dr Richard Trask

Advanced Composites Centre for Innovation & ScienceDepartment of Aerospace Engineering, University of Bristol, UK

R.S.Trask@Bristol.ac.uk

Outline

Nature –some insight

Bio-Inspiration and Engineering Synthesis

–Novel Architecture for Enhanced Performance–Controlled Damage Formation/Propagation–Vascular Channels

Concluding Remarks

Nature –some insight

Arthropod Exoskeletons :mineralised chitin-protein

fibres, forming a twisted plywood structure

Nanoscaledesignofthesmallestbuildingblocks

HierarchicalorganizationofstructureControlledorientationofstructuralelements

FunctionallygradedpropertiesDurableinterfacesbetweenhardandsoftcomponentsUniqueenergymechanisms

absorbing

Helicoidalprincipleoffibrecompositedesign–wood,bone,exoskeletonsVascularchannelsRemodelling/

self-healing

Bone: layers of lower stiffness alternating with layers of

higher stiffness

Nature –

some insight

Nanoscaledesignofthesmallestbuildingblocks

HierarchicalorganizationofstructureControlledorientationofstructuralelements

FunctionallygradedpropertiesDurableinterfacesbetweenhardandsoftcomponentsUniqueenergymechanisms

absorbing

Antler fracture surface in

bending

Microcracking in Dentin

Helicoidalprincipleoffibrecompositedesign–wood,bone,exoskeletonsVascularchannelsRemodelling/self-healing

Toughening in bovine horn: enhanced toughness due to tubular collapse. Tensile fracture silica sponge spicules

Novel Architecture for Enhanced Performance

Bio-Inspiration

Engineeringsynthesis

––

DTCExtendedProject(3-monthstudy)

Bamboo-vascularbundles:functionallygradedstructure

Functionally graded fibre cell

structure through

maximisation of layering

Bamboo

–

Bamboo–nodes:roletoreinforcetheintermodalwallsagainstBrazierbuckling.‘Spring-like’jointsrestorestemgeometryafterbending.

SilicaSpongeSpicules–geometrichierarchical

–

organizationofstructure,

–

SilicaSpongeSpicules–uniquestructuralperformancethroughlatticeandspicules

bundles

Silica sponge spicules

Controlled Damage Formation/Propagation

Bio-Inspiration

––

Nacreismostlymadeofamineral(aragoniteCaCO3,95%vol.),arrangedtogetherwithasmallamount(5%vol.)ofsofterorganicbiopolymers.

Mostlymadeofaragonite,nacreis3000timestougherthan

aragonite

Progress in Materials Science 54 (2009) 1059–1100

The multi-scale structure of nacre

Inelastic deformation, associate to tablet

sliding and damage spreading

Controlled Damage Formation/Propagation

EngineeringSynthesis

Biologicallyinspirednextgenerationouterbodyarmour-BINGO

Supportedby:Armour&ProtectionScience&TechnologyCentre,CDE,UKMOD

Modellingapproachforbodyarmour(LS-Dyna®)

–

QuarterplateFEAmodel,meso-scalenacre

panelthicknessplateletgeometry

Impact model assembled in LS-Dyna

®

–

Consideringnumerical,geometrical&materialcharacteristics;

mesh-sensitivityandplateletsize

panelthicknesstoavoidthreatpenetrationvariationinmaterialproperties

Furtherinvestigations

––

Influenceofplateletlocking

Functionallygradedproperties(density)toincreaseenergyabsorption

Vascular Channels

Bio-Inspiration

EngineeringSynthesis-1

–Vasculatureembedment

–Laminatedisruptionminimised,maximisemechanical

performance

Fabrication Route A–Preform laid between two central 0//0

plies during lay-up.

Fabrication Route B–Preform laid into pre-cut recessesin central plies.

70

60

/1389/1363138903_f476

d218c2.jpg

Load, N

50

40

30

20

10

Winterborne J, 2005. Hydroponics -Indoor Horticulture

Extension, mm

Mode I fracture toughness

Crack arrest at vascules under 10J impact event

Vascular Channels

ChemistrySynthesis

–Localisedcatalystdistribution

Aim:Controlledhealingatfracturesite

EngineeringSynthesis-2

–Stimulustriggeredsandwichstructures.

self-healing

in

Healingandsensornetworkinsandwichcore Remotepressuresensor

Damageeventtriggerspressuredrop,peristalticpump

activated

SEM image: Glass capillary with Treated with a

solution of RuCl2(PCy3)2CHPh (0.25 mM).

–Porouspolymerfibres

Aim:Throughlifehealingnetwork[healingsecretedthroughmembrane]

PVDF (Polyvinylidene Fluoride)

Inner/outer diameter: 1.0/1.5 mm

Concluding Remarks

Weareactivelypursuingthedevelopmentofnewandnovelcompositematerials,whichmimictheuniquecharacteristicsobservedinnature,i.e.

–Functionallygraded–Energyabsorbing–Vascular

–Remodelling/self-healing–Senseandrespond

Acknowledgements

Multifunctional Composites Research Group

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