IIMEC Related Activities of U. Patras on Multi-Functional Materials

1. IIMEC Related Activities of U. Patras on Multi-Functional Materials Dimitris A. Saravanos Professor Nikolaos A. Chrysochoidis Research Fellow Third Annual Meeting, Annenberg Presidential Conference Center, Texas A&M University, College Station, Texas 18-19 January 2012

2. Delphi Patras Mycenae Olympia Location

3. Outline Organization of International Conference ICAST 2011 supported by IIMEC Participation in Schools organized during the last year Participation in Workshop organized at the field of wind energy - Egypt Student exchanges Other Research activities of University of Patras in the areas of IIMEC Future Activities

4. Outline Organization of International Conference ICAST 2011 supported by IIMEC Participation in Schools organized during the last year Participation in Workshop organized at the field of wind energy - Egypt Student exchanges Other Research activities of University of Patras in the areas of IIMEC Future Activities

5. Three Days Two parallel sessions 108 Participants 3 keynote lectures 65 Oral presentations 38 Posters Berlin (Potsdam) London Paris Ascona Rome Corfu Athens Conference Chair Dimitris Saravanos Professor, University of Patras

6. ICAST 2011 - Sessions Sessions: • Multi functional materials • Morphing Structures • Semi- Active vibration control • Energy Harvesting and self-powered devices • Adaptive Wind Turbine Rotors • Active Contol • Damping • SHM • Actuation and Sensing Devices

7. ICAST 2011 - IIMEC Support Support of 15 students covering their registration and lodging expenses

8. ICAST 2011 • Three Days • Two parallel sessions • 108 Participants • 3 keynote lectures • 65 Oral presentations • 38 Posters

9. Outline Organization of International Conference ICAST 2011 with the IIMEC Support Participation in Schools organized during the last year Participation in Workshop organized at the field of wind energy Student exchange Other Research activities of University of Patras in the areas of IIMEC Future Activities

10. Summer School • Lectures covered topics on : • Thermodynamics • Micromechanics • Homogenisation • Modeling & Characterization of SMA • Fatigue and Damage mechanics • Non Destructive Evaluation • Applications of SMA • Social Events: • Visit to Dodoni Theatre • Excursion to Zagorochoria (Monodendri) • Dinner at Mystagogia University of Patras participated with two students: KonstantinosGeorgopoulos-Bosinas and Thodoris Machairas having interactions with students from various nationalities.

11. Winter School IIMEC WINTER SCHOOL computational materials science across scales January 8th-17th, 2012 in College Station, TX Nikolaos Chrysochoidis attended to the Winter School thanks to the full IIMEC support

12. Outline Organization of International Conference ICAST 2011 with the IIMEC Support Participation on Schools organized during the last year Participation on a Workshop organized at the field of wind energy Students exchange Other Research activities of University of Patras in the areas of IIMEC Future Activities

13. MaterialCouplingEffects on Composite Structures • Chortis, D. I, and Saravanos, D. A., 2011, “Linear and non-linear coupled damped structural dynamics models for large wind turbine blades”, International Workshop: Advanced Materials for Wind Turbine Blades, Cairo, Egypt. • Notable Results: • Strong effect of coupling terms on blade mode shape. • The difference is eliminated at θ=00 and 900 where the material coupling effect is physically vanished. • Evaluated nonlinear effects on stiffness and damping of large blades • Material Coupling Effect on Gl/Ep Blade-Models with Various Ply Angle Laminations at Girder Objectives: • Model effects of coupling on blade structural stiffness and damping • Includedinto DAMPBEAM FE and Structural Dynamics code.

14. Nonlinear Damped Structural Dynamics Objectives: • Model nonlinear effects due to large displacements-rotations on blade stiffness and damping • New nonlinear damped beam Finite Element • Nonlinear DAMPBEAMcode. Predicted Stiffening Effect due to rotational loads and gravity Box-Section Girder Model of 54m WT blade Fxcentrifugal Fxgravity

15. Outline Organization of International Conference ICAST 2011 with the IIMEC Support Participation on Schools organized during the last year Participation on a Workshop organized at the field of wind energy Student exchange Other Research activities of University of Patras in the areas of IIMEC Future Activities

16. Student Exchange TAMUvisit:Duration: 3 months , 5 May to 5 August Visitor: AlexandrosSolomouPhd candidate at University of Patras, Greece • Subjects : • 1D Users material Subroutine with thermomechanical coupling • A new 1D users material subroutine developed for the simulation of the SMA wires response taking into account the thermomechanical coupling in constitutive laws. The developed UMAT captures efficiently Sma’sthermomechanical response making the designing process of Sma wire actuator more effective. In this work Lagouda’s and coworkers Sma’s constitutive model is used. • Back stress model • The Back stress model aims to capture the highly anisotropic transformation strain generation and recovery observed in actuator components subjected to common material processing and training methods.

17. 1D UMAT with thermomechanical couplingCOMPARISON OF COUPLED AND UNCOUPLED MODEL

18. Back Stress Model Motivation: Training load affects the transformation strain that a material exhibits during actuation procedures. This effect is due to the internal stresses that are accumulated during training and their direction is strongly related to the type of training load. By implementing the back stress in the model we are trying to capture internal stress effects. Experimental procedure Step 1 : Training of the specimen under axial load Step 2 : Applying Moment Step 3 : Adding axial force Step 5 : Heating of the specimen while the applied moment and axial force are remained constant Step 4 : Cooling of the specimen while the applied moment and axial force are remained constant in order to calculate the transformation strain

19. Back Stress Model (Continue..) Transformation strain evolution equation : Back stress tensor Transformation strain direction Transformation strain Magnitude Equivalent shear transformation strain Tensile transformation strain Outcome: An upcoming joint paper at the SPIE conference at March 2012 coauthored by Darren Hartl and Dimitris Lagoudas

20. Outline Organization of International Conference ICAST 2011 with the IIMEC Support Participation on Schools organized during the last year Participation on a Workshop organized at the field of wind energy Students exchange Other Research activities of University of Patras in the areas of IIMEC Future Activities

21. Structural Health Monitoring of Polymer Matrix CompositesNon linear Ultrasonics Technique Objective: Development of a new Structural Health Monitoring methodology based on damage detection via non –linear wave modulation characteristics.

22. Structural Health Monitoring of Polymer Matrix CompositesNon linear Ultrasonics Technique Experimental Setup for Impact Damage Detection in Composite Plates Results: Detection of Impact Damage Conclusions: • Ability to reveal even small damage sizes • Efficient for all common damage types of composites: • Delamination Debondings • Matrix cracks • Single lap adhesive joints 4J Impact load Healthy

23. Development of Morphing Chevron with SMA wires Framework Objectives • Implementation of constitutive model in Abaqus UMAT • Primary FEA for proof of concept • SMA characterization • Detailed FE Analyses • Manufacturing & Testing of Adaptive strip & full scale prototype • Development of an adaptive chevron in order to reduce the noise levels during airplane’s operation. • Chevron to move between two positions: • deformed during take off/landing (min 7degs penetration) • Open in cruising. • Apply internal SMA wire actuators • Target shape: minimum of 7 degs tip deflection >7o MorphingChevron Adaptive Full Scale Prototype Adaptive Strip

24. Outline Organization of International Conference ICAST 2011 with the IIMEC Support Participation on Schools organized during the last year Participation on a Workshop organized at the field of wind energy Students exchange Other Research activities of University of Patras in the areas of IIMEC Future Activities

25. Future Activities University of Patras National Technical University of Athens Center of Recycled Energy Sources • Topics • Modeling tools for Wind Turbine Blades • Aeroelasticity • Damping • Non linear Effects • Design Optimization Organization of a School Related on Modeling of Wind Turbine Blades Participation of DTU Risø and Delft University Possible participation of British University in Cairo

26. Future Activities Students Exchanges Expected visit of one student from TAMU to University of Patras to spend three months in Greece Visit of ThodorisMachairas at Tamu of three months from May to July 2012

27. Thanks for the Attention Special thanks to the IIMEC institute Questions?