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Multi-Scale Structural                                                                                                    ...
2012 AFOSR SPRING REVIEWNAME: David StargelBRIEF DESCRIPTION OF PORTFOLIO:FLIGHT STRUCTURES: Fundamental basic research in...
Thrust AreasDISTRIBUTION A: Approved for public release; distribution is unlimited.                                       ...
ChallengesDISTRIBUTION A: Approved for public release; distribution is unlimited.                                         ...
Collaborations• NASA - Ed Glaessgen/Steve Smith• ARO/ARL - David Stepp/Jim Chang• ONR - Ignacio Perez/Liming Salvino/David...
Structural Mechanics Vision of    Future Weapon SystemsDISTRIBUTION A: Approved for public release; distribution is unlimi...
Digital Twin VisionDISTRIBUTION A: Approved for public release; distribution is unlimited.                                ...
Key Workshop Recommendations1. Material Scale Modeling  –   Develop high fidelity 3D microstructures of heterogeneous mate...
AFRL Notional Digital Twin Roadmap DISTRIBUTION A: Approved for public release; distribution is unlimited.                ...
A Common Vision of Future                            Capabilities                                                       Pl...
National Multi Scale Foundational               Research Plan ProcessThe “Plan for the Plan”• Phase 1- 2011: Education   •...
Comprehensive Technical Objectives      – Computational Damage MechanicsDISTRIBUTION A: Approved for public release; distr...
Challenging and exciting scientific opportunities   DISTRIBUTION A: Approved for public release; distribution is unlimited...
Transformational Computing in Aerospace         Science & Engineering                               AFOSR PMs: Douglas Smi...
Transformational Computing in              Aerospace Science & Engineering  To create transformational approaches in compu...
Forecasting Aircraft Usage for Prognosis                LRIR PIs: Ben Smarslok, Eric Tuegel, and Ravi PenmetsaBackground &...
A Bayesian Experimental Design Approach for Optimization and                       Uncertainty Quantification in Aerospace...
Enabling MethodologiesDISTRIBUTION A: Approved for public release; distribution is unlimited.                             ...
Active Knits for Radical Change Air Force                     Structures                              PI: Dr. Diann Brei, ...
Analytical Model     Novelty of approach: includes operational transitions, friction, load path, and active materialsDISTR...
Flow Control ApplicationsFlaps, Spoilers, Vortex Generators                                                               ...
Rib Stitch Architecture and                       Operation                                                Rib Stitch Arch...
Rib Stitch Prototype Fabrication                                               and Testing                                ...
Compliant MechanismsDISTRIBUTION A: Approved for public release; distribution is unlimited.                               ...
Passively Morphing Ornithopter Wing for       Increased Lift and Agility      PIs: Dr. James E. Hubbard Jr., U of Maryland...
AFRL/AFOSR Workshop on Compliant         Mechanisms in Micro Air Vehicle DesignThe primary objective of this workshop is t...
ODISSEI: Origami Design for Integration of Self-              assembling Systems for Engineering Innovation               ...
Multi-Scale Structural Mechanics                      Summary  Past                            Present• Three core thrusts...
Questions?9 March 2012   DISTRIBUTION A: Approved for public release; distribution is unlimited.   29
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Stargel - Multi-Scale Structural Mechanics and Prognosis - Spring Review 2012

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Dr. David Stargel presents an overview of his program - Multi-Scale Structural Mechanics and Prognosis - at the AFOSR 2012 Spring Review.

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Transcript of "Stargel - Multi-Scale Structural Mechanics and Prognosis - Spring Review 2012"

  1. 1. Multi-Scale Structural Mechanics and Prognosis 09 MAR 2012 Dr. David Stargel Program Manager AFOSR/RSA Integrity  Service  Excellence Air Force Research Laboratory9 March 2012 DISTRIBUTION A: Approved for public release; distribution is unlimited. 1
  2. 2. 2012 AFOSR SPRING REVIEWNAME: David StargelBRIEF DESCRIPTION OF PORTFOLIO:FLIGHT STRUCTURES: Fundamental basic research intostructural mechanics problems relevant to the US Air ForceStructural mechanics or Mechanics of structures is the computation ofdeformations, deflections, and internal forces or stresses (stress equivalents)within structures, either for design or for performance evaluation of existingstructures*LIST SUB-AREAS IN PORTFOLIO: Focus w/in sub-areas Novel flight structures Computing Multi-scale modeling and prognosis Predicting Structural dynamics Enabling * From Wikipedia DISTRIBUTION A: Approved for public release; distribution is unlimited. 2
  3. 3. Thrust AreasDISTRIBUTION A: Approved for public release; distribution is unlimited. 3
  4. 4. ChallengesDISTRIBUTION A: Approved for public release; distribution is unlimited. 4
  5. 5. Collaborations• NASA - Ed Glaessgen/Steve Smith• ARO/ARL - David Stepp/Jim Chang• ONR - Ignacio Perez/Liming Salvino/David Shifler• NSF – Christina Bloebaum• DTRA – Su Peiris• MURI on Uncertainty – Fariba Fahroo• Mathematics for Multi-Scale Modeling – Fariba Fahroo• AOARD/EOARD/SOARD• Transformational Computing – John Luginsland/Tatjana Curcic• MURI on Hybrid Structures –Joycelyn Harrison/Ali Sayir DISTRIBUTION A: Approved for public release; distribution is unlimited. 5
  6. 6. Structural Mechanics Vision of Future Weapon SystemsDISTRIBUTION A: Approved for public release; distribution is unlimited. 6
  7. 7. Digital Twin VisionDISTRIBUTION A: Approved for public release; distribution is unlimited. 7
  8. 8. Key Workshop Recommendations1. Material Scale Modeling – Develop high fidelity 3D microstructures of heterogeneous materials – Need better representation of mechanics in homogenization-derived reduced order models2. Deterministic Multiscale Modeling – Develop a computational environment with flexibility to accommodate different methodologies in conjunction with actual physics and mathematics of the different domains – Explore new up-scaling and down-scaling strategies along with advances in multiple-temporal-scale modeling3. Uncertainty Quantification – Explore holistic combination of deterministic and probabilistic modeling – Enhance probabilistically-based sensitivity methods to identify important variables DISTRIBUTION A: Approved for public release; distribution is unlimited. 8
  9. 9. AFRL Notional Digital Twin Roadmap DISTRIBUTION A: Approved for public release; distribution is unlimited. 9
  10. 10. A Common Vision of Future Capabilities Planned Capabilities Hypersonic Strategic Long-Duration Autonomous Space Bombers Reconnaissance Vehicles VehiclesShared Technical Challenges Computational Damage Mechanics Structural Health Management Experimental Damage Mechanics Risk-Based Design Materials Engineering & Processing DISTRIBUTION A: Approved for public release; distribution is unlimited. 10
  11. 11. National Multi Scale Foundational Research Plan ProcessThe “Plan for the Plan”• Phase 1- 2011: Education • Inform damage mechanics community of the plan and ensure participation • Develop framework for plan organization• Phase 2 – early 2012: Organization • Further refine thrust area plan details • Establish database of current funded efforts • Estimate funding requirements and shortfalls to achieve stated plan goals• Phase 3 – late 2012: Utilization • Use identified funding requirements and proof of collaboration between agencies to advocate for increased resources for multi-scale damage mechanics research Each Agency will continue to utilize existing funding instruments DISTRIBUTION A: Approved for public release; distribution is unlimited. 11
  12. 12. Comprehensive Technical Objectives – Computational Damage MechanicsDISTRIBUTION A: Approved for public release; distribution is unlimited. 12
  13. 13. Challenging and exciting scientific opportunities DISTRIBUTION A: Approved for public release; distribution is unlimited. 13
  14. 14. Transformational Computing in Aerospace Science & Engineering AFOSR PMs: Douglas Smith & David Stargel In consultation with Curcic, Fahroo, & Luginsland (T–CASE) Today, 2011 Tomorrow, 2015 Future, 2025… • To create transformational approaches in computing for aerospace science and engineering  Novel micro- • Multi-disciplinary approach including novel architectures? computer architectures, system software,  Hybrid/complementary and mathematical algorithms photonic methods? • Emphasis on  Quantum-based • Multi-scale modeling & structural systems? mechanics  Bio-computing? • Complex flow physics modeling &  Neuro-morphic control computing? DISTRIBUTION A: Approved for public release; distribution is unlimited. 14
  15. 15. Transformational Computing in Aerospace Science & Engineering To create transformational approaches in computing for aerospace science and engineering. “How can we exploit quantum computing architectures specifically to advance aerospace computing?”University of California San Diego Team University of Pittsburgh TeamLead PI: Dr. David Meyer Lead PI: Dr. Peyman Givi TodayProject Title: Project Title:Applications of Quantum Computing in Tomorrow Speedup for Turbulent QuantumAerospace Science and Engineering Combustion SimulationsTeam Disciplines: Team Disciplines:Mathematics, Computational Science, Mechanical Eng., Materials Science,Structural Eng., Mechanical and Physics, Quantum Theory, Simulation andAerospace Eng., Chemistry, Physics ModelingApproaches: Approaches:(1) Combine four quantum subroutines (1) Quantum algorithms that operate on into quantumFuture … for efficiently algorithm general purpose quantum computers solving systems of linear equations (2) Avenues for quantum simulation on(2) Application of quantum search quantum devices algorithms for use in optimization problems DISTRIBUTION A: Approved for public release; distribution is unlimited. 15
  16. 16. Forecasting Aircraft Usage for Prognosis LRIR PIs: Ben Smarslok, Eric Tuegel, and Ravi PenmetsaBackground & Motivation• Material state evolution is nonlinear & history dependent• Reliable structural prognosis requires the generation of realistic loading and environmental sequences• Existing techniques focus on a single structural load parameter history• Used ABAQUS Solver – Developed scripts to translate CFD pressures onto the FE mesh• ~1 Million DOF• 2.5 hrs of run time using 2 cores of a single CPU – 30 Min for actual static analysis – 2 hrs processing input file DISTRIBUTION A: Approved for public release; distribution is unlimited. 16
  17. 17. A Bayesian Experimental Design Approach for Optimization and Uncertainty Quantification in Aerospace Structural Modeling and Analysis PI: Dr. Michael Todd, UCSD Objective Some Fundamental Basic Science Issues Develop a framework for “optimal” model • Logical accounting of relevant uncertainty selection, performance assessment, updating, sources and uncertainty assessment in aerospace • Consistent transition probability model that structural modeling propagates uncertainty through the decision- making process A sound uncertainty management methodology • Optimization strategy of complex, likely non- - Mechanism Model smooth decision surfaces - Uncertainty Quantification and Propagation • Determination of the cost function - Uncertainty Updating form(s)…application-specificity - Verification and Validation FEM and Usage Model Information Dynamic monitoring update Uncertainty AnalysisYongming Liu, Clarkson University Concurrent structural fatigue Probabilistic Uncertainty Bayesian Verification & damage prognosis under Physical Fatigue Modeling Updating Validation uncertainties Variability Prognosis Damage Model Inspection RUL Mechanism Uncertainty SHM update Analysis The ideal future… • Completely known physics with no (or negligibly little) uncertainty • A much Much MUCH greater computational capacity DISTRIBUTION A: Approved for public release; distribution is unlimited. 17
  18. 18. Enabling MethodologiesDISTRIBUTION A: Approved for public release; distribution is unlimited. 18
  19. 19. Active Knits for Radical Change Air Force Structures PI: Dr. Diann Brei, University of Michigan GRANT # FA9550-09-1-0217Contraction Rolled Furling TwistingGarter Stitch Stockinette Stitch I-Cord Forward Backward Loop Loop Backward Loop Backward A Rear Connecting Loop Ridge A wire Accordion Arching Rib Stitch Seed Stitch Backward Forward Loop Loop Backward Forward Loop Loop DISTRIBUTION A: Approved for public release; distribution is unlimited. 19
  20. 20. Analytical Model Novelty of approach: includes operational transitions, friction, load path, and active materialsDISTRIBUTION A: Approved for public release; distribution is unlimited. 20
  21. 21. Flow Control ApplicationsFlaps, Spoilers, Vortex Generators Synthetic Jets• Change effective shape of wing • Constant disturbance delays midflight boundary layer separation• Effective at leading and • Traditional jet mechanisms trailing edge of the wing increase design complexity• Large size and weight prohibit (http://www.aerospaceweb.org) (Holman et al., 2005) • Piezoelectric active jets are Flap and VGS Synthetic Jet full integration of distributed promising but debond at high actuators over wing frequencies Benefits (Collis, 2004) • Reduce Drag (Smith, 1998; Cattafesta, 2001, Crook 1999) • Enhance Lift Bumps and Spars Roughness Elements • Improve Maneuverability• Contour bumps theoretically • Distributed surface texturing reduce transonic drag ~15% • Increase Fuel Economy • Reduce turbulent skin friction• Spars theoretically reduce • Expand Mission Variety drag up to 30% shear stresses by 9.9% • Difficult to create distributed• Actively varying height mid- actuation across surface of flight and creating large wing deformations difficult (Stanewsky, 2001) (Bein et al., 2000) Leading Edge Distributed (Milholen, 2004; Stanewsky, 2001) Contour Bump Roughness Elements (Dearing, 2007; Lambert, 2006)Technological Needs: Large Displacements, High Pressure, DistributedActuation DISTRIBUTION A: Approved for public release; distribution is unlimited. 21
  22. 22. Rib Stitch Architecture and Operation Rib Stitch Architecture Knit Purl Forward Rib: Backward Rib: Column Column Knit Loops Purl Loops Rear Forward Ridges Ridges http://www.spin-knit-dye.com Traditional Fiber Textile SMA Wire Schematic Rib Stitch Operational Mechanism Balanced Force Couples F F• Martensite Compressed State - Applied load flattens ridges F F - Leg connecting knit to purl loops bends horizontally in the less stiff state F Unbalanced Force Couples• Austenite Expanded State F - Material stiffens and straightens, recovering plastic F F deformation from Martensite State Forward Rib (Knit Loops) - Increased stiffness and unbalanced force couples Backward Rib cause the forward ribs to lift and backward ribs to (Purl Loops) depress Rib Stitch Actuation Mechanism DISTRIBUTION A: Approved for public release; distribution is unlimited. 22
  23. 23. Rib Stitch Prototype Fabrication and Testing Prototypes Prototype Testing 16 wales 1k 2p 2k 2p 2k 2p 2k 2p 1k Stainless Steel Rods Linear Ball Bearings 14 courses 72 mm Slider Plate Base Plate Rib Stitch Encoder Strip Knit Prototype Experimental Setup 140 mm 100 *Area = 0.010 Austenite Expanded Rib Stitch Prototype m2 19.6 g Mass = 90 80 Heat Martensite Compressed 70 6 5 Applied Load Cool Increase Force (N) 60 (Fapp) Applied Load Load (2*Fapp) 50 Heat 2*D Act Plate 40 4 3 D Act Apply Rib Plate 30 Cool Plate Knit Load2*hMcomp 20 >hMcomp Rib Rib Knits Knit 10 Heat 0 1 2 a) Stacked Rib Stitch Configuration b) Nestled Rib Stitch Configuration 0 5 10 15 20 Stacked Rib Nestled Rib Knit Prototype Height (mm) Knit Actuator Actuator Experimental Procedure DISTRIBUTION A: Approved for public release; distribution is unlimited. 23
  24. 24. Compliant MechanismsDISTRIBUTION A: Approved for public release; distribution is unlimited. 24
  25. 25. Passively Morphing Ornithopter Wing for Increased Lift and Agility PIs: Dr. James E. Hubbard Jr., U of Maryland and Dr. Mary I. Frecker, Penn State FA9550-09-1-0632DISTRIBUTION A: Approved for public release; distribution is unlimited. 25
  26. 26. AFRL/AFOSR Workshop on Compliant Mechanisms in Micro Air Vehicle DesignThe primary objective of this workshop is to 1. Investigate the research challenges associated with applying Compliant Mechanism (CM) design methodology to flapping Micro Air Vehicle (MAV) designs, with a extension to general air vehicle designs. 2. Explore past and on-going research in this application area to determine the current state of the art and to aid in determining future feasibility. 3. Establish collaboration between compliant mechanism design and air-vehicle design communities in order to leverage current and future research opportunities with the goal of more affordable and reliable vehicle design.Suggested topics  Methodology  Laminar emergent mechanism  Design synthesis  Smart/adaptive structure & actuator  Performance definition, calculation and  Fabrication measurement  Softening or statically balanced compliant  Passive shape change and complex motion mechanism generation  Flapping Micro Air Vehicle  Multi-DOF compliant mechanism  OrigamiMarch 26th and 27th, 2012, Tec^Edge, Dayton, OhioWorkshop Chairs: Dr. David Stargel (AFOSR) and Dr. James Joo (RBSA) DISTRIBUTION A: Approved for public release; distribution is unlimited. 26
  27. 27. ODISSEI: Origami Design for Integration of Self- assembling Systems for Engineering Innovation Collaborative effort with NSF EFRI Program AFOSR PMs: Fariba Fahroo, Joycelyn Harrison, Doug Smith, & David Stargel Mathematical Rigor• Four themes: + Artistic Inspiration – A: Compliant Mechanisms Active Design – B: Active Materials Materials Theory Origami – C: Bio-origami – D: Foldable Structures and Micro-structures Adaptive Morphing• Required Elements: System (AMS) – ODISSEI-1 – Development of scientific, mathematical, and/or design theories and methods for folding/unfolding – ODISSEI-2 – Development of theoretical foundations for self-assembly at all scales and across scales. – ODISSEI-3 -Computational discovery and tools to facilitate design of complex systems through folding and unfolding mechanisms• PIs are strongly encouraged to include community outreach and educational opportunities for outreach DISTRIBUTION A: Approved for public release; distribution is unlimited. 27
  28. 28. Multi-Scale Structural Mechanics Summary Past Present• Three core thrusts with the integrating vision of a Virtual FutureTwin Concept • Novel Flight Structures Few tests represent • Multi-scalefleet aircraft Modeling and Prognosis Each aircraft has its • Structural Dynamics CAE supplements own virtual twin experimental fleet models• Focus program on core concepts of structural mechanics • Computing • Predicting • Enabling• Program is coordinated and actively collaborating withother government agencies and within AFOSR• Exploring new transformational capabilities • Quantum Computing for Aerospace Sciences • Origami Engineering DISTRIBUTION A: Approved for public release; distribution is unlimited. 28
  29. 29. Questions?9 March 2012 DISTRIBUTION A: Approved for public release; distribution is unlimited. 29
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