Inherently Adaptive Structural Materials. Technova Corporation

Transcription

1 Inherently Adaptive Structural Materials Technova Corporation

2 Outline of the Presentation Structural and Adaptive Qualities of Bone Biomimetic Principles of Adaptive Materials Design & Evaluation of Integrated Adaptive Systems Processing of Nanocomposites Modeling and Validation of Structural Principles

3 Development of Bone Structure Cancellous Bone Compact Bone

4 Mechanisms of Bone Adaptation Loads Build of Bone Remodeling Strains Comparison Signal Electrical Potential Gradient Under Bending Bone Remodeling Under Bending

5 Consequences of Bone Adaptation Arrangement of Struts Along Principal Strain Lines Optimization of Topology

6 Outline of the Presentation Structural and Adaptive Qualities of Bone Biomimetic Principles of Adaptive Materials Design & Evaluation of Integrated Adaptive Systems Processing of Nanocomposites Modeling and Validation of Structural Principles

7 Key Constituents and Processes Piezoelectricity V = g.s.t Q = d.s.a Electrolysis V = Vo + i.r + Ve Q = n.f Solid Electrolytes

8 Experimental Validation of Electrolysis Through Solid Electrolyte Electrolytic Cell Current, ma Voltage, mv Voltammogram Micrographs

9 Design & Validation of Piezo-Driven Electrolysis Stress, MPa 30 Applied Stress: 1 Time, sec Piezoelectric Stack St ainless St eel Mesh Copper-Ion Conducting Polymer Copper Layer

10 Outline of the Presentation Structural and Adaptive Qualities of Bone Biomimetic Principles of Adaptive Materials Design & Evaluation of Integrated Adaptive Systems Processing of Nanocomposites Modeling and Validation of Structural Principles

11 Designs and Validation of a Basic System Replicated Multilayers of: Insulative Layer (Ti) Conductive Layer (Tc) Piezoelectric Layer (Tp) Solid Electrolyte Layer (Ts) Metallic Layer (Tm) T V = g 33.s.T p Q = d 33.s.(n.L 1.W 1 ) L L1 W1 W Schematic Presentation Processing and Test Set-Ups System T i T c T p T s T m I (conventional) 50 µm 50 µm 50 µm 50 µm 50 µm II (nanocomposite) 5 nm 5 nm 50 nm 40 nm 40 nm Alternative Designs

12 An Elaborate Adaptive Element e e A A Section A-A Nanolayered Composite Comprising Replicated: Insulative Nanolayer (Ti) Conductive Nanolayer (Tc) Piezoelectric Nanolayer (Tp) Solid Electrolyte Nanoayer (Ts) Metallic Nanoayer (Tm) Mass Transfer Mass Transfer e e (a) (b) (c) (d) (e)

13 Detailed System Design and Analysis 1 m 1 mm Nanolayered Composite Comprising Replicated: Insulative Nanolayer (Ti = 5 nanometer) Conductive Nanolayer (Tc = 5 nanometer) Piezoelectric Nanolayer (Tp = 150 nanometer) Solid Electrolyte Nanoayer (Ts = 40 nanometer) Metallic Nanoayer (Tm = 150 nanometer) A A 10 mm e Section A-A System Design 8.33 MPa 43 MPa -26 MPa 8.33 MPa e (a) Concentric Loading (b) Eccentric Loading (c) Concentricity Restored by Self-Adaptation Structural & Adaptive Analysis

14 Preliminary Assessment of Structural Implications

15 Preliminary Assessment of Structural Implications

16 Outline of the Presentation Structural and Adaptive Qualities of Bone Biomimetic Principles of Adaptive Materials Design & Evaluation of Integrated Adaptive Systems Processing of Nanocomposites Modeling and Validation of Structural Principles

17 Ionic Self-Assembly: Basic Principles Mechanism of Self-Assembly Build-Up of Nanolayers

18 Adaptation of Ionic Self-Assembly Sub st r at e / PEI Sub str at e PEI/[PSS/PAH]3 PAH/PS119 PEI/[PSS/PAH]3 Au]1 PAh/PS119/ZrO2 PEI/[PSS/PAH]3 Au/PAH]2 PEI/[PSS/PAH]3 Au/PAH]3 Multiple ZrO2/Polymer Layers Manual and Automated Processing Self-Assembly of Colloidal Nanoparticles

19 Self-Assembly of Piezoelectric and Conducting Nanolayers V C 0 Ionically Self-Assembled, Mult ilayer PSS/PDDA System ITO-Coated Glass Substrate Elect rode F Elect r ode Output VOltage, mv Applied Force, g

20 Outline of the Presentation Structural and Adaptive Qualities of Bone Biomimetic Principles of Adaptive Materials Design & Evaluation of Integrated Adaptive Systems Processing of Nanocomposite Modeling and Validation of Structural Principles

21 Section-Level Structural Modeling f cdac + f ldal = N Ac Al f c ydac + f l ydal = A c A l M Modeling Principles Effect of Hybrid Nanolayer Build-Up on RVC Section Behavior

22 Preliminary System-Level Analysis (a) Bending (b) Buckling (c) Yielding (d) Fracture Failure Modes Effect of Multi-Layer Polymer/Ceramic/Metal Build-Up on Bulk Properties of RVC Open-Cell System Property Density Elastic Modulus Tensile Strength Composite/Base Ratio

23 Preliminary Structural Evaluation Stress, MPa After Deposition of Polymeric Nanolayers As-Received Open-Cell Structure and Tension Test Set-Up Strain, mm/mm Effect of Polymer Nanolayers on Tensile Behavior of Open-Cell Structure

24 Summary & Conclusions Selection of adaptive system constituents and viable architectures Modeling, design and experimental validation of adaptive structures Implementation of nanocomposite processing techniques Modeling and validation of structural principles