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Harrison - Low Density Materials - Spring Review 2012
 

Harrison - Low Density Materials - Spring Review 2012

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Dr. Joycelyn Harrison presents an overview of her program - Low Density Materials - at the AFOSR 2012 Spring Review.

Dr. Joycelyn Harrison presents an overview of her program - Low Density Materials - at the AFOSR 2012 Spring Review.

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    Harrison - Low Density Materials - Spring Review 2012 Harrison - Low Density Materials - Spring Review 2012 Presentation Transcript

    • Low Density Materials 09 MAR 2012 Joycelyn S. Harrison Program Manager AFOSR/RSA Integrity  Service  Excellence Air Force Research Laboratory24 February 2012 DISTRIBUTION A: Approved for public release; distribution is unlimited. 1
    • 2012 AFOSR SPRING REVIEWNAME: Low Density MaterialsPORTFOLIO DESCRIPTION :Transformative research targeting advanced materials that enablesubstantial reductions in system weight with enhancements inperformance and function.Research within the portfolio is focused on INCREASING theSPECIFIC PERFORMANCE of aerospace platforms.PORTFOLIO SUB-AREAS:Structural LightweightingMultifunctionalityHybrid MaterialsIncreased emphasis on forging interdisciplinaryteams to address broad-base challenges DISTRIBUTION A: Approved for public release; distribution is unlimited. 2
    • Why Low Density Materials? If it has structure and rises above the ground, material density is important!Material density impacts: payload capacity, range, cost, agility, survivability, environmental impact…. DISTRIBUTION A: Approved for public release; distribution is unlimited. 3
    • Increasing Specific Performance in Aerospace Platforms Specific Performance Performance * r -1 DISTRIBUTION A: Approved for public release; distribution is unlimited. 4
    • Polyimide Nanofiber Reinforced Structures Dr. Yuris DzenisNovel Material Synthesis McBroom ProfessorIncorporating steric hindances and reducedchain periodicity to achieve:- Organo-solubility- Structural rigidity and toughness Dr. Stephen Cheng- High thermal stability NAE Robert C. Musson Trustees Professor Dr. Frank W. Harris Distinguished Professor Emeritus DISTRIBUTION A: Approved for public release; distribution is unlimited. 5
    • Nanofiber Reinforced StructuresHigh Strength, Tough Polyimide Nanofibers 9000 Tensile Strength Vs Fiber Diameter Advanced carbon fiber Ultimate Tensile Strength (MPa) 8000 7000 6000 5000 4000 3000 2000 1000 0 0 100 200 300 400 Fiber Diameter (nm) 3000 Toughness Vs Fiber Diameter 2500 Toughness (MPa) 2000 1500 Continuous nanofibers electrospun 1000 from novel, soluble polyimide 500 8.7 GPa strength 0 47% failure strain 0 100 200 Fiber Diameter (nm) 300 400 2,500 MPA toughness DISTRIBUTION A: Approved for public release; distribution is unlimited. 6
    • Translation of Nanoscale Properties to Macroscale StructuresFundamental Challenge: Improving CNT-CNT Load Transfer Dr. Ben Wang Fellow – IIE, SME, SAMPE Densely Packed, Alignment Flattened CNTs Dr. Richard LiangCNT Bundles DISTRIBUTION A: Approved for public release; distribution is unlimited. 7
    • CNT-CNT Reaction MechanismsFundamental Challenge: CNT-CNT Bonding Crosslinking MWCNTs via Covalent Bonds A. V. Krasheninnikov, K. Nordlund, “Ion and Electron Irradiation-Induced Effects in Nanostructured Materials,” J. Appl. Phys. 107, 071301, 2010 Irradiation-induced Crosslinking of CNTs DISTRIBUTION A: Approved for public release; distribution is unlimited. 8
    • Training Tomorrow’s Workforce(AFOSR DURIP 11) Acquisition of aThermal Field Emission ScanningElectron MicroscopeNanoparticle Reinforced Resins for ReadilyProcessable, High Temperature, Low Density Dr. David Veazie • 2010 AFRL SummerComposites and Energetic Materials Faculty Fellow at AFRL/RW “The SEM will meet the increasingly stringent • National Technical requirements of cutting-edge materials Achiever of the Year technology for fundamental research and the education and research training of students.” SEM of 0.3 wt% graphite/PETI-298, confirming the dispersed graphene DISTRIBUTION A: Approved for public release; distribution is unlimited. 9
    • DISTRIBUTION A: Approved for public release; distribution is unlimited. 10
    • Multifunctionality: CNT Fibers Liquid Phase Processing of CNTs Dr. Matteo Pasquali Cryo-TEM CNT/ Polarized light micrograph of 10 mm Technologychlorosulfonic acid dispersion CNT/chlorosulfonic acid dispersion Transfer Research in Typical Acid Spun Fiber collaboration with Teijin Aramids 37±3µm DISTRIBUTION A: Approved for public release; distribution is unlimited. 11
    • Multifunctionality Load-bearing + Electrical Conductivity 3 LED wired and held by 2.5 “invisible” CNT fibers Tensile Strength/Density PAN C fiber Mm2/s2 or N/Tex 2 Pitch C fiber Ni-coated 1.5 PAN C fiber RICE CNT fiber 1 0.5 Steel Aluminum Silver Nickel Gold Copper 0 0 5 10 Electrical conductivity/density (kS m2 / kg) 15• Best electrical conductivity reported for neat CNT fibers• Order of magnitude increase in electrical & thermal conductivity and strength Research in collaboration of Teijin Aramids DISTRIBUTION A: Approved for public release; distribution is unlimited. 12
    • Enabling Multifunctionality: Graphene NanocompositesNon-covalent functionalization of graphene in solution GRAPHITE OUR METHOD: NON- STATUS QUO: COVALENT OXIDATION STABILIZATION1 Stabilizers: Dr. Micah Green GRAPHENE • 2010 AFOSR Young OXIDE PRISTINE Investigator Award GRAPHENE PVP π-π stackers Dispersions are stable against pH Advantages: changes, heat, lyophilization Disadvantage: Retains conductivity, Insulating, oxidative debris stabilizer can be tailored to applicationPhysisorption of PVP on graphene surfaceguarantees excellent interfacial load transfer11Wajid et al, Carbon, 2012 DISTRIBUTION A: Approved for public release; distribution is unlimited. 13
    • BNNT Multifunctionality Carbon Boron nitride nanotubes nanotubes Mechanical Properties 1.33 TPa 1.18 TPa Electrical Metallic or Semiconducting Properties semiconducting (~ 5.5 eV bandBNNT gap) Permanent Polarity No net dipole dipole Piezoelectric (0.25-0.4 C/m2) Neutron C = 0.0035 B = 767 (B10 Scattering ~3800) cross-section N = 1.9 Thermal Stable to Stable toCNT Oxidative 300 – 400 C in 800 C in air Stability air DISTRIBUTION A: Approved for public release; distribution is unlimited. 14
    • Single Tube Nanomechanics Tensile Test 1st report of radial deformability of BNNT Effective Radial Elastic Modulus (GPa) single-wall Boron Nitride Nanotube 60 Carbon Nanotube double-wall 40Single tube pull-out test triple-wall Dr. Changhong Ke 2010 AFOSR Young 20 Investigator Award 0Peel Test 0 1 2 3 4 5 6 Nanotube Outer Diameter (nm) BNNTs have 40-60% lower effective radial elastic modulus than comparable CNTs DISTRIBUTION A: Approved for public release; distribution is unlimited. 15
    • Multifunctionality Load-bearing + Actuation 1st experimental observation of electrostrictive strain in BNNT Theoretical Prediction of SWCNT film Net Polarization electrodes BNNT Dr. Cheol Park active layer 0.0005 In-Plane Strain (mm/mm) PE+ES Strain PE Strain 0.0004 ES Strain Prof. Alex Zettl In-Plane Strain (mm/mm) 0.0003 0.0002 Fellow - APS 0.0001Field induced strain (e33) 0.0000 e33 = d33·E + M33·E2 + … -1.0 -0.5 0.0 Electric Field (MV/m) Electric Field 0.5 (MV/m) 1.0 DISTRIBUTION A: Approved for public release; distribution is unlimited. 16
    • Multifunctionality Load-bearing + Radiation Shielding Neutron Shielding UV Shielding 2.0 30 wt% (Projected) 1.8 Absorption Coefficient (m) [mm ] 1.6 -1 (Shielding Effectiveness) 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 LDPE 30 wt% BN Powder 5 wt% BNNT LDPE h-BN BNNTShielding Effectiveness of BNNT exceeds h-BN on weight basis DISTRIBUTION A: Approved for public release; distribution is unlimited. 17
    • Nanostructured Carbon 3D 2D ? 1D Graphene Carbon Nanotubes 0DFullerene DISTRIBUTION A: Approved for public release; distribution is unlimited. 18
    • MURI 11 Topic: Nanofabrication of 3D Nanotube ArchitecturesObjective: Controlled assembly and atomic-scale bonding of nanoscale elements (e.g. carbonnanotubes and graphene), leading to network structures with exceptional 3D thermo-electro-mechanical properties Materials Enabling Future Aerospace Needs Multi-Path Synthesis and Assembly - doping-induced branching - metal nanoparticle-induced branching - atomic nanotube welders Multifunctional Structural Materials Thermal Multiscale Characterization Energy Management Conversion & - atomic scale structure Storage Materials - node integrity - mechanical properties - electron & phonon transport Multiscale-Multiphysics Design Morphing & Electronic & - density function theory Actuation Sensor Devices - molecular dynamics (MD) Devices - mesoscale/continuum models - finite element DISTRIBUTION A: Approved for public release; distribution is unlimited. 19
    • Synthesis and Characterization of 3D Carbon Nanotube Solid Networks, Rice U. MURI TeamPulickel M. Ajayan, PI Ray BaughmanSynthesis, characterization, Synthesis, fiber spinning,mechanical, electrochemical, mechanical, thermo-mechanical,thermal properties electro-mechanical properties Mauricio TerronesJames Tour Synthesis, chemical processing,Synthesis, chemistry, atomic scale characterization,devices, electrical properties structure modeling Jonghwan SuhrMatteo Pasquali Synthesis, modeling,Solvent processing, rheology, thermo-mechanical behavior,fibers, mechanical properties viscoelastic properties, compositesBoris Yakobson Multidisciplinary, Collaborative TeamAb-initio modeling, simulations,structure-property correlations,thermo-mechanical properties DISTRIBUTION A: Approved for public release; distribution is unlimited. 20
    • Nanofabrication of 3D Nanotube Architectures Case Western Reserve U., MURI Team DISTRIBUTION A: Approved for public release; distribution is unlimited. 21
    • DISTRIBUTION A: Approved for public release; distribution is unlimited. 22
    • Hybrid Materials Design Design the structurebased on limitations of the material DISTRIBUTION A: Approved for public release; distribution is unlimited. 23
    • Hybrid Materials DesignMaterials Modeling Hierarchy Macro Engineering Materials Science Micro Discipline Chemistry Atomistic Physics Electronic pm nm µm mm Length Scale *Slide created by Dr. Tim Brietzman, ARFL/RXBC DISTRIBUTION A: Approved for public release; distribution is unlimited. 24
    • Hybrid Materials DesignConnecting Atomistic & Microscale Behaviors -- Essential for Materials Design Stress History 6 Stress (GPa) 5 4 3 Dr. Tim Breitzman 2 AFRL/RXBC 1 Polymer 0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 network Strain breakdown 6 Number of scissions 4 2 Dr. Rajiv Berry 0 AFRL/RXBN 0 500 1000 StepMolecular representation ofepoxy resin and mapping ofnanoscale voids due to bond Dr. Jim Mollerscission DISTRIBUTION A: Approved for public release; distribution is unlimited. 25
    • ICMSE Hybrid Materials Design Prof. Reinhold Dauskardt Fellow – ACerS, ASM DISTRIBUTION A: Approved for public release; distribution is unlimited. 26
    • 2011 Basic Research Initiative AFOSR/NSF Joint Research Solicitation ODISSEI: Origami Design for Integration of Self-assembling Systems for Engineering Innovation Advance understanding of folding and unfolding of materials structures across scales for design of engineered systems• Packaging/Deploying Control Surfaces Satellites Solar sails • Materials Precision air drop Hierarchial materials design Tube launched systems Atomistic assembly Active/tunable materials• Mechanisms Compliant mechanisms Actuators DISTRIBUTION A: Approved for public release; distribution is unlimited. 27
    • Research Community Leadership AFRL DOD COMMUNITY DIRECTORATES Reliance 21 Board RX, RV, RW Materials and AFOSR LRIRs, STTRs, Processing COI MURIs, Low Workshops, OTHER AGENCIES Reviews, VisitsDensity Lightweight StructuresMaterials INTERNATIONAL US-India Tunable Nanostructured Materials Materials Forum US-AFRICA Origami Initiative Engineering DISTRIBUTION A: Approved for public release; distribution is unlimited. 28
    • Acknowledgements Dr. Marilyn Minus Dr. Ajit Roy Dr. Brandon Arritt Dr. Greg Odegard Dr. Kishore Dr. Samit Roy AFRL/RV AFRL/RX Pochiaju Dr. Rajesh Naik Dr. Ryan JusticeDr. Ashlie Martini Dr. Satish Kumar Dr. James Seferis AFRL/RX AFRL/RX GloCal Network Corp. Dr. Robert Moon Dr. Henry Sodano Dr. Olesya Zhupanska 2011 DARPA Young Faculty Dr. Chris Muratore Dr. Benji MarayamaDr. Jeff Youngblood AFRL/RX AFRL/RX Dr. Sharmila Mukhopadhyay Dr. Soumya Patnaik Dr. Markus J. Dr. Mesfin Tsige AFRL/RX Buehler DISTRIBUTION A: Approved for public release; distribution is unlimited. 29
    • DISTRIBUTION A: Approved for public release; distribution is unlimited. 30