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Multifunctional Bio-Nano Materials and Structures Technologies for - - PowerPoint PPT Presentation

Multifunctional Bio-Nano Materials and Structures Technologies for Aeronautics and Space Exploration Dimitris C. Lagoudas Institute Director Daniel C. Davis Director of Operations Texas Institute for Intelligent Bio-Nano Materials and


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SLIDE 1

Multifunctional Bio-Nano Materials and Structures Technologies for Aeronautics and Space Exploration

Texas Institute for Intelligent Bio-Nano Materials and Structures for Aerospace Vehicles Texas A&M University College Station, TX 77843-3409

Dimitris C. Lagoudas Institute Director Daniel C. Davis Director of Operations

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SLIDE 2

NASA & Nanotechnology

University Research, Engineering & Technology Institutes (URETIs)

Bio-Inspired Design and Processing of Multi-Functional Nano-Composites (BIMat) Institute for Nanoelectronics and Computing (INAC)

  • Design and modeling of hierarchically

structured materials capable of bio-sensing catalysis and self-healing

  • Develop fundamental knowledge and

enabling technologies in: ultradense memory, ultraperformance devices, integrated sensors, and adaptive systems

  • Princeton
  • UCSB
  • Northwestern
  • U of NC
  • Nat’l Inst.

Aerospace

  • Purdue
  • Yale
  • Northwestern
  • U of Fl
  • Cornell
  • UCSD
  • Texas A&M

URETIs

Center for Cell Mimetic Space Exploration (CMISE) Institute for Intelligent Bio-Nano Materials and Structures for Aerospace Vehicles (TiiMS)

  • Basic and applied research in the integration
  • f sensing, computing, actuation and

communication in smart materials

  • Bio-informatics for the development of new,

scalable nano-technologies in sensors, actuators and energy sources

  • UCLA
  • CIT
  • Ariz. St
  • UCI
  • Texas A&M
  • Rice
  • Texas Southern
  • Prairie View A&M
  • U of T-A
  • U of Houston
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SLIDE 3

UNIVERSITY PARTICIPANTS

University of Texas at Arlington Texas A&M University University of Houston Rice University Texas Southern University Prairie View A&M University

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SLIDE 4

Objectives of TiiMS

Through this advanced research and development activity, produce more highly educated and trained science, technology, engineering and mathematics (STEM) professionals for NASA, the Nation’s national defense and economic development. Develop through multiscale approaches and new innovations in nanotechnology, multifunctional materials and devices for the design of future aeronautics and space exploration vehicles and systems.

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SLIDE 5

Research and Education Thrust Areas

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SLIDE 6
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SLIDE 7

Proof of Concept:

Multifunctional Shell for Space Structure

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SLIDE 8

Proof of Concept:

Hierarchical Structure of Multifunctional Morphing-Capable Wing

Wing Tip Sails Deployed for Low Speed Flight and Morphing to a Solid Tip for High Speed Flight Turbulent Drag Reducing Epidermis with Embedded Nanotube Skin Friction Sensors Virtual, Trailing-Edge, Synthetic Gurney Flap for Circulation Control Leading-Edge Bio- Chemical Warfare Agent Sensors Synthetic Jets for Virtual Shaping and Separation Control MultiSensor MEMS Arrays for Flow Control Feedback SMA Spar/Torque Tube with Active Bending/Torsion Stiffness Control SMA Camber and Thickness Control Actuators Intermediate Data Processing and Fusion Center MEMS Piezoceramic Actuators for Epidermis Shape Control Supercapacitor for Powering the Piezoceramic Actuators Supercapacitor Electrode Consisting

  • f Nanotubes for

Maximum Surface Area/Charge Collapsible Cellular Structure with NiTi cells, using Pseudoelasticity Effect for Impact Absorption Aeroelastically Self-Tailored Twist via:

  • Active Structural Stiffness Control
  • Active Flow Control
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SLIDE 9

Single Wall Carbon Nanotubes Functionalized Dispersed Carbon Nanotubes Multiscale Modeling and Simulations Multifunctional Material Systems Intelligent Aerospace Vehicle

Bridging the Length Scales – from Nanomaterials to Aerospace Systems 10-10m 102m

Research Challenge

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SLIDE 10

Research Thrust: Functionalized Nanomaterials Research Activities:

  • Nanotube purification,

functionalization, separation and dispersion.

  • Strength and toughness
  • f organic and inorganic

nanocomposites.

  • Polymeric

nanocomposites for multifunctional use with improved conductivity properties.

  • Studying

multifunctionality of nanocomposites

Nanostructures: 100 times stronger than steel at 1/6 the weight.

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SLIDE 11

Single-Walled Carbon Nanotubes

Reinforced PPF polymer with Functionalized SWNTs

200 400 600 800 1000 1200 1400

Flexural M odulus (M Pa)

10 20 30 40 50 60 70

Flexural Strength (M Pa) PPF 0.1% Pristine SWNTs / PPF 0.1% Functionalized SWNTs / PPF

Sidewall functionalization

(J. Tour, E. Barrera, R. Smalley, @Rice)

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SLIDE 12

Elastomeric Reinforcement (Siloxane) by Functionalized SWNTs

Tensile testing Composition dependence

  • J. Tour, Rice U.; R. Krishnamoorti, U. Houston;
  • C. Dyke, NanoComposites Inc.,

Technology licensed, being commercialized for annular blowout preventers (BOPs), elastomers enduring up to 20,000 psi with 90” ODs

HO(CH

2)10

O

Tour

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SLIDE 13

Current TiiMS Projects for FY 2007 Functionalized Nanomaterials

  • T. Randall Lee, University of Houston, trlee@uh.edu

“Non-covalent polymer-wrapping of single-walled carbon nanotubes SWNTs) for the preparation lightweight, high strength structural composites” Ramanan Krishnamoorti, University of Houston, ramanan@uh.edu “Surfactant assisted dispersion of single walled carbon nanotubes in polymers for structural and multifunctional applications” Enrique Barrera, Rice University, ebarrera@rice.edu “Nanotechnology to practice: epoxy/carbon fiber/nanotube composites for double cantilever beam testing and proof of concept stress sensing” James Tour, Rice University, tour@rice.edu “Light-weight low-loss magneto-dielectrics using single wall carbon nanotube composites” Rick Wilkins, Prairie View A&M University, r_wilkins@pvamu.edu “Radiation studies of bio-nano materials and devices”

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SLIDE 14

Research Thrust: Multifunctional Material Systems Research Activities:

  • Multifunctional materials and

systems at nano – micro – meso - macro physical length scales.

  • Experimental validations of

hierarchical material models for structural, electrical, and thermal functionality.

  • Integrate porous SMAs into

smart structures relevant to multifunctional lightweight space applications and shape control of morphing wings.

  • Life assessment of multi-

functional nanocomposite materials and structures.

Collapsible Cellular Structure with NiTi cells, using Pseudoelasticity Effect for Impact Absorption MEMS Piezoceramic Actuators for Epidermis Shape Control Turbulent Drag Reducing Epidermis with Embedded Nanotube Skin Friction Sensors Supercapacitor for Powering the Piezoceramic Actuators

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SLIDE 15

Actuation Characteristics of Multifunctional Materials

Carbon Nanotubes

Based on Original Graph by Don Leo, VPI

Electroactive Ceramics Shape Memory Alloys (SMAs) Ionic / Electronic Conducting Polymers I-PVDF

10

  • 2

10 10

2

10

  • 2

10

  • 1

10 10

1

10

2

10

3

10

4

5 J/m3 50 J/m3 500 J/m3 5 kJ/m3 50 kJ/m3 500 kJ/m3 5 MJ/m3 50 MJ/m3

I-PVDF

Actuation Strain (%) Actuation Stress (MPa)

Dielectric Elastomer Magnetic Shape Memory Alloys (MSMA)

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SLIDE 16

Yi-chao Chen, University of Houston, chen@uh.edu “Constitutive modeling and characterization of shape memory polymers” Naomi Halas, Rice University, halas@rice.edu “Nanophotonics-based cancer diagnostics for long duration manned space missions” Wiley Kirk, University of Texas at Arlington, kirk@nanofab.uta.edu “Radiation tolerance of multifunctional materials for high-efficiency solar-cell applications” Dimitris Lagoudas, Texas A&M University, d-lagoudas@tamu.edu “Novel approach of reinforcing a nanofiber based biosensor via coaxial electrospinning” Zoubeida Ounaies, Texas A&M University, zounaies@aero.tamu.edu “Active nanocomposites for future aerospace applications” Pradeep Sharma, University of Houston, sharma@uh.edu “A new paradigm in designing piezoelectric sensors and materials using nanoscale effects”

Current TiiMS Projects for FY 2007

Multifunctional Material Systems

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SLIDE 17

Research Thrust: Biomaterials and Devices

Research Activities:

  • Integrate nanomaterials and

biomaterials into multifunctional devices.

  • Produce novel biomaterials

(protein composites) with sealants and adhesives for structural self- healing.

  • Develop Continuous Mixer for

high shear mixing of SWNT and Bio-fluids.

  • Investigate the toxicology of

SWNT and nanocomposites.

Bio-Chemical Agent Sensors

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SLIDE 18

αHL-(M113FK147N)7

R S

  • 8
  • 6
  • 4
  • 2

0.00 0.05 0.10 Normalized Count (N) Amplitude (pA)

  • 8
  • 6
  • 4
  • 2

0.00 0.05 0.10 Normalized Count (N) Amplitude (pA)

  • 8
  • 6
  • 4
  • 2

0.00 0.05 0.10 Normalized Count (N) Amplitude (pA)

1 3 ms R S R S

  • 20
  • 20

Level 0: βCD, Level 1: S-thalidomide, Level 2: R-thalidomide.

0oC 20oC 40oC 60oC 80oC 100oC

α-HL, β-CD analyte.

  • 20

2 1 2

  • A novel a-hemolysin mutant pore, αHL-(M113FK147N)7 has been

designed that is stable and functional at temperatures up to 100°C.

  • The single-molecule nanopore chiral sensor at elevated

temperatures might have important applications in exobiology and spacecraft.

a b c Xiaofeng Kang, Stephen Cheley and Hagan Bayley @TAMU

High Temperature Protein Nanopore Sensor

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SLIDE 19

Current TiiMS Projects for FY 2007 Multiscale Modeling

Boris Yakobson, Rice University, biy@rice.edu “Towards predictive multi-timescale modeling of nanotube-matrix interface in Nanocomposites” John Whitcomb, Texas A&M University, whit@aero.tamu.edu “Multiscale framework for computational modeling of multifunctional materials”

Biomaterials & Devices

Allison Rice-Ficht, Texas A&M University, a-ficht@tamu.edu “Fabrication of life sensors: Combining microfluidic technology with protein nanopore sensors” Olufisayo Jejelowo, Texas Southern University, jejelowo_oa@tsu.edu “Simple Hybridization microbial detection device”

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SLIDE 20

Research Thrust: Intelligent Systems

Research Activities

  • Develop sophisticated

integrated engineered materials, sensing, and actuation systems with high strength-to-weight ratios.

  • Develop autonomous

control system designs with the robustness, intelligence and adaptability to accommodate distributed and hierarchical (multiscale) sensing and actuation.

Survivability: Distributed Nervous System Self-Healing Systems Strong, Lightweight: Integral Wing-Body Structure Morphing: Continuous Optimal Shape control

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SLIDE 21

Biologically Inspired Systems: Enabling Aircraft and Spacecraft to Morph

Original Research that Combines Traditional Control and Intelligent Control:

  • Structured Adaptive Model Inversion Control (SAMI)

– Flight controller to handle wide variation in dynamic properties due to shape change

  • Machine Learning

– Learns the optimal shape at every flight condition in real-time

Control Theory for Autonomous, Intelligent, Robust, and Adaptive Systems Comparable to Flying Birds

2-D Plate Rectangular Block Ellipsoid Delta Wing Final 20 0 3 20 0 4 20 0 5 20 0 6 Objective

Morphing: Continuous Optimal Shape Control

Progress in Morphing Control and Simulation

John Valasek @ TAMU

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SLIDE 22

Current TiiMS Projects for FY 2007 Intelligent Systems

John Junkins, Texas A&M University, junkins@tamu.edu

“Modeling and control of redundantly actuated intelligent and

morphable aerospace systems” Andrew Meade, Rice University, meade@rice.edu “Development of a knowledge-based numerical tool for the design of functionalized nanocomposites” Satish Nagarajaiah, Rice University, nagaraja@rice.edu “Nanocomposites for sensing, actuation, structural health monitoring and damage detection of aero-space systems” David Zimmerman, University of Houston, dzimmerman@uh.edu “Structural health monitoring using measured ritz vectors”

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SLIDE 23

REU Site “Nanotechnology and Materials Systems”

Sponsored By: National Science Foundation NSF Grant

  • No. 0453578

Air Force Office of Scientific Research, U.S. Air Force, Department of Defense ASSURE Program PIs: Dr. D.C. Davis and Dr. D.C. Lagoudas

Total Student Participation FY2005 - FY2006

Texas A&M University – 24 Tuskegee University – 1 Prairie View A&M – 2 North Carolina A&T University – 3 Virginia Commonwealth University – 1 University of Texas – Pan Am – 2 Indiana University – Bloomington – 1 University of Puerto Rico – 1 Louisiana Tech University - 1

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SLIDE 24

Minority Leaders Program “Sensors and Nanocomposites Research”

A $49.5 million indefinite-delivery/ indefinite-quantity contract (FY 2005 – 2009) focusing on involvement of the Historical Black Colleges and Universities/ Minority Institutes in translation

  • f

promising basic research new sensors, materials, and manufacturing process into solutions for broadly defined military needs. The locations

  • f

performance are Universal Technology in Dayton, OH and Clarkson Aerospace in Houston, TX. The Air Force Research Laboratory at Wright-Patterson Air Force Base, OH issued the contract (FA8650-05-D-1912). Participating Universities: Texas A&M University (Lead University), Prairie View A&M University, Texas Southern University, University of Houston, Rice University, plus 12 other universities.

  • Dr. Daniel C. Davis, University Lead
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NSF NIRT: “Novel Manufacturing and Modeling Approaches for Multi-Scale Monolithic and Hybrid Phase Transforming Nanostructures”

  • Active nanoscale structures and nanosystems capable of actuation and sensing are

needed for a wide range of applications in nanomedicine, nanoelectronics, space exploration, homeland security and defense.

  • An integrated team of co-PIs from Texas A&M University and Georgia Tech will establish a

comprehensive interdisciplinary program in hierarchical manufacturing and modeling for phase transforming magnetic shape memory alloys (MSMA). PIs: Dimitris Lagoudas, Ibrahim Karaman, Xinghang Zhang, Jun Kameoka, TAMU; Ken Gall, GA Tech

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SLIDE 26

NSF NIRT: “Active Electromechanical Nanostructures without the Use of Piezoelectric Constituents ”

PIs: Pradeep Sharma, UH; Zoubeida Ounaies, TAMU; Ramanan Krishnamoorti, UH; Boris Yakobson, RU

  • To understand and develop active electromechanical nanostructures that exhibit an apparent

piezoelectric behavior even though none of the constituent materials themselves are piezoelectric by exploiting nanoscale effects.

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SLIDE 27

A NASA Cooperative Agreement Research Opportunities in Aeronautics

A TAMU collaboration with: National Institute of Aerospace, NanoRidge and NASA Langley Research Center

Research Focus: Multiscale modeling and characterization of CNT reinforced multifunctional composites as new lightweight durable materials for improved subsonic fixed wing vehicle performance

PIs: Dimitris Lagoudas, TAMU; Sarah-Jane Frankland, Tom Clancy, NIA

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SLIDE 28

TiiMS Research Leads to New Nanotechnology Companies

1000 2000 3000 4000 5000 6000 7000

Control (No SWNT at Carderock) No SWNT F-SWNT Silane- SWNT SWNT-Br Ally-SWNT SWNT

Formulation (0.1wt% SWNTs) Short Beam Shear Strength (Psi)

First-run(3-04) Second-Run(6-04)

20 40 60 80 100 120 140 200 400 600 800 Control (0 wt % SWNT) Specimen with 0.7 wt % SWNT

Stress (Psi) Strain (%) NanoRidge Materials, Inc. Houston, TX CEO: Chris Lundberg CTO: Enrique Barrera Initial funding raised Four initial projects for NASA, DOD, and a a polymer Co. Licensed key IP NanoComposites, LLC Houston, TX CEO: Barry Drayson CTO: Chris Dyke CTAdvisor: James Tour Initial funding raised Key project with Hydril Licensed key IP

NASA URETI research and Nanotubes from Richard Smalley that lead to commercial work and real revenue for two start-up companies.

~50% Improvement in Z-axis properties for composites currently being sold. Three times the strength increase in rubber. An Oil Field o-ring that was shown at the Offshore Technology Conference in Houston, TX. 0.1 wt.% SWNT Loadings

Red-First run Blue-Second Run Short beam shear strength (PSI) VARTM used to make large components. Microwave processing gives a new approach.

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SLIDE 29

Education and Outreach

Major Objectives:

  • Train the next generation of

aerospace engineers and scientists.

  • Increase the number of engineers

and scientists from under- represented groups.

  • Introduce nano-science and

engineering to K-12 schools through established and emerging education programs.

  • Provide professional development
  • pportunities for K-12 educators

focusing on nanoscience and engineering initiatives.

  • Provide training to students and

educators in interdisciplinary education in science, mathematics, and engineering.

Undergraduate Student Design

“The majority of the Institute’s budget will be spent on education.”

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SLIDE 30

Field Trips

  • NASA Johnson Space Center (JSC)

in Houston, Texas

  • The Zyvex Corporation

in Richardson, Texas

  • The University of Texas at Dallas

in Richardson, Texas

  • The Lockheed-Martin Corporation

in Fort Worth, Texas

REU students in front of an F-16 at Lockheed Martin In front of mock shuttle Nanotechnology Presentation

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SLIDE 31

TiiMS 3rdAnnual Review - Poster Session - 2005

  • Mrs. Magdalini Lagoudas

Jessica Fichuk Brent Volk Justin Maddox Daniel Ayewah Nicholas Shaver

  • Dr. Boris Yakobson

Poster presentations can be seen at: tiims.tamu.edu/2005summerREU/presentations.html

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SLIDE 32

SUMMARY

Extended funding is being sought to sustain the operations of the Texas Institute for Intelligent Bio-Nano Materials and Structures (TiiMS). TiiMS will continue to focus on supporting precollege, undergraduate and graduate students, and post-doctorate researchers to produce a new generation of highly trained, educated and diverse cadre of science, technology, engineer, and mathematics (STEM) professionals for the Nation and the State of Texas. TiiMS will provide a base for the growth of new research and education programs in multifunctional materials development for applications in aerospace, energy and power generation, sensors and communications and bio-sciences to serve NASA, the national defense and economic growth of the Nation and the State of Texas.

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SLIDE 33

TiiMS 223 WERC MS 3409 TAMU College Station, TX 77843-3409 Phone: 979/ 845-9409 Fax: 979/ 862-7087 e-mail: pam@aero.tamu.edu http://tiims.tamu.edu ☺

Thank You For further information contact:

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SLIDE 34

Multifunctional Materials for Aerospace Applications

Dimitris C. Lagoudas

Department of Aerospace Engineering Texas A&M University

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SLIDE 35

Current Applications of SMAs

Biomedical Space Robotics Biomimetics

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SLIDE 36

SMA-Actuated Variable Geometry Chevrons

SMA

  • Noise reduction at take-
  • ff due to SMA-actuated

chevrons

  • Autonomous retraction

during low temperature cruise increases efficiency

(Courtesy of The Boeing Company)

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SLIDE 37

Model Implementation: FEA

ONLY ONLY ONLY

Frictionless contact enforced ( X 6)

Assembly

  • SLOT connectors

used to “bolt” down SMA beams

  • SLIDE-PLANE

connectors used to prevent beam rotation

  • Contact enforced

between SMA beam edge nodes and chevron elements (no friction)

Loading Steps

1. Clamp beams (T<As) 2. Heat beams (T>Af) 3. Cool (Mf<T<Ms) 4. Heat beams (T>Af)

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SLIDE 38

Results of FEA Analysis: Overview

Centerline Profile Deflection Contours Tip Deflection History Stress (VM) Contours

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SLIDE 39

Experimental Validation: Flight Testing

Comparison of flight test data with analysis; Take-off condition (Calkins, Butler, Mabe: AIAA 2006-2546)

  • 4
  • 2

2 4 6 8 10 12 14 0.2 0.0

  • 0.2
  • 0.4
  • 0.6
  • 0.8
  • 1.0

Centerline Axis, in

  • 4
  • 2

2 4 6 8 10 12 14 Centerline Axis, in Experimental (Photogrammetry) Numerical Analysis 6 4 2

  • 2
  • 4
  • 6

6 4 2

  • 2
  • 4
  • 6
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SLIDE 40

Use of Analysis Tools for Modeling of VGC Actuation Cycles

Legacy Method: Design, Build, Test, Iterate→ Optimize Preferred Method: Characterize, Analyze → Optimize

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SLIDE 41

Potential Use of SMAs for Passive Vibration Isolation in Aerospace Vehicles

Vibration Isolation System Payload Launch Vehicle

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SLIDE 42

Transformation temperatures of Ti50Pd40Ni10 alloy

Nominal composition of Ti50Pd40Ni10 alloy fabricated by Vacuum arc melt technique. Hot rolled at 900°C (30% reduction in thickness)

As cast alloy

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SLIDE 43

Specimens and Experimental Setup for Characterization of HTSMAs

EDM cut tensile specimens Water cooled grips Furnace Water cooled extensometer MTS frame Tensile Specimen

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SLIDE 44

SMA Actuated Automobile

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SLIDE 45

Temperature Actuated SMA Flow Regulator

Detwinned martensite Horizontal velocity and pressure profiles

Flow Direction

Initial position of the SMA membrane Final (Deformed) geometry

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SLIDE 46

Multiscale modeling of fluid flow in porous SMAs

Porous SMA Development of numerical homogenization FEM methods for complex flow problems in shape changing materials

RVE Geometry and solid domain (green) Typical fluid-structure coupling Cell problem Typical cell problem for diffusion coefficient

Inflow

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SLIDE 47

Magnetic Shape Memory Alloy Applications

High Frequency MSMA Actuators:

source: http://www.adaptamat.com Force: 3 N (max) Stroke: 0.6 mm (max) Frequency: 0-1000 Hz Force: 1 kN (max) Stroke: 1 mm (max) Frequency: 0-100 Hz

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SLIDE 48

Magnetic Shape Memory Effect

Large Recoverable Magnetic Field- Induced Strains

NiMnGa Single Crystal Specimen

Reference: www.adaptamat.com

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SLIDE 49

Magneto-Thermo-Mechanical Testing of MSMA

  • Tension/compression mechanical loading on MTS frame
  • Variable magnetic field (<2T)
  • Controllable temperature (-110 °C to room temp.)
  • Cyclic Loading
  • Tested material systems: NiMnGa, CoNiAl, CoNiGa

0.5 1 1.5 2 2.5 3 3.5 4 4.5 5

  • 15000
  • 10000
  • 5000

5000 10000 15000

H [kG] Magnetic Field-Induced Strain [%]

1 MPa 2 MPa 3 MPa 4 MPa 6 MPa

Magnetic Field [kG] Magnetic Field-Induced Strain [%]

Mechanical Load Magnetic Field

Source: I. Karaman, Texas A&M University

Experimental Setup Magnetic Field-Induced Strains

Ni2MnGa [100](110)

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SLIDE 50

Application of FEM Analysis with MSMAs

Improved Design of Experiments

Mechanical Load

Source: I. Karaman, Texas A&M University

Nonmagnetic Grips Nonmagnetic Grips

Hall Probe Magnetic Field

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SLIDE 51

Space Applications

  • f Shape Memory Polymers (SMPs)

Develop an integrated computational environment for design and analysis of SMP structures and devices

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SLIDE 52
  • Integration of models into commercial

software with standardized material characterization protocols

Future Challenges in Shape Memory Materials

  • High Temperature SMAs - Modeling

efforts must address true material rate dependency

  • Magnetic field induced phase

transformation in MSMAs with higher blocking stress

  • Integration of thermo-magneto-

mechanical coupling

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SLIDE 53

Motivation For Carbon Nanotube Reinforced Composites: Applications

► High modulus and strength to weight ratios of carbon nanotubes and their large aspect ratio make carbon nanotubes attractive as reinforcing material ► Electrical and thermal properties of carbon nanotubes as well as storage ability make carbon nanotube composites multifunctional

NASA ARES Mars Aircraft Boeing 787

► Applications in terms of engineering design require large scale production and reliable estimates material properties from measurement and modeling

Gram s SW NT 9 0 w t% SW NT 5 0 w t% MW NT < 8 nm MW NT > 5 0 nm 1 0 $ 1 ,3 5 0 $ 3 0 0 $ 2 7 5 $ 7 5 1 0 0 $ 8 ,5 0 0 $ 2 ,2 5 0 $ 1 ,5 0 0 $ 4 0 0 1 KG $ 7 5 ,0 0 0 $ 3 0 ,0 0 0 $ 3 ,5 0 0 $ 9 0 0

http://www.cheaptubesinc.com

θ =30ο θ=0o θ

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SLIDE 54

Electrical Conductivity governed by electron hopping

Electrical Conductivity: 9 order increase at 1% weight

Motivation for Carbon Nanotube-Polymer Multifunctional Nanocomposites

► Large disparity between CNT, Polymer Properties: ► Measured nanocomposite properties less than some anticipated

Young’s Modulus: CNT 2-3 Orders Larger than Epoxy Electrical Conductivity: CNT 14-18 Orders Larger than Epoxy Thermal Conductivity: CNT 4 Orders Larger than Epoxy Young’s Modulus: 20% increase at 1% weight Thermal Conductivity: 30% increase to at 1% weight

► Nanoscale effects identified as having strong influence on nanocomposite properties:

Load transfer governed by van der Waals forces and functionalization Thermal Conductivity governed by interface thermal resistance

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SLIDE 55

1.E-15 1.E-14 1.E-13 1.E-12 1.E-11 1.E-10 1.E-09 1.E-08 1.E-07 1.E-06 1.E-05 1.E-04 1.E-03 1.E-02 1.E-01 0.0005 0.001 0.0015 0.002 0.0025 0.003 0.0035

Cabon Nanotube Volume Fraction Electrical Conductivity (S/cm)

Martin et al. 2004 High Shear Mix MWNT Sandler et al. 1999 Ultrason. MWNT 4 Layer Rand. Orient. Comp. Cyinder Gojny et al. 2006 Milled SWNT TAMU Composite Data

Comparison of Micromechanics Model to Measured Nanocomposite Electrical Conductivity

Micromechanics High Shear Mix MWNT Ultrasonicated MWNT Milled SWNT

Single Wall Double CNTs Multiple CNTs Twisted Bundle

  • TEM Imaging by Piyush Thakre
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SLIDE 56

Texas Institute for Intelligent Bio-Nano Materials and Structures for Aerospace Vehicles

Atomistic Description of Carbon Nanotube Polymer Composite

Polymer Carbon Nanotube

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SLIDE 57
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SLIDE 58

Lamina Microscale

Characterization of Composites at Multiple Scales

250 μm

Carbon Fabric Longitudinal Transverse Carbon Fibers

Fiber-Graded Interphase Scale Macroscale Composite Nanocomposite: Nanoscale and microscale

TEM micrograph showing good wetting between SWCNT rope and Epoxy

CNT rope Epoxy

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SLIDE 59

Carbon Fiber

Nanotubes

Fracture surface of laminate with Pristine SWCNTs Matrix

SEM image showing CNT bridging cracks but weak fiber-matrix bonding

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SLIDE 60

Multifunctional Colloidal Suspensions: Reversibility and Switch Between “Resistor” & “Capacitor” from Reconfigurable Antennas

  • 800 nm gold nanoparticles, 0.1 mM

NaHCO3

2.5 V, 1 MHz 2.5 V, 100 Hz-1 MHz-10 Hz

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SLIDE 61
  • Effect of Inhomogeneous Electric Fields on Colloidal Transport

pointed electrode near a flat electrode conducting islands between planar electrodes

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SLIDE 62

Acknowledgement to Sponsors

  • Army Research Office (ARO)
  • Air Force Office of Scientific Research (AFOSR)
  • Air Force Laboratory (AFRL)
  • Defense Advanced Research Projects Agency (DARPA)
  • National Science Foundation (NSF)
  • Sandia National Laboratories
  • NASA – TiiMS URETI
  • NASA – LaRC
  • NASA - Glenn
  • Boeing Co.
  • Schlumberger
  • CRDF, NDSEG
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SLIDE 63

Graduate and Undergraduate Students “Research Activities”

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SLIDE 64

Graduate and Undergraduate Students “Research Activities”

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SLIDE 65

Thank you!

Σας ευχαριστώ

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SLIDE 66

Celestial Mechanics with Atoms