CAE354 Smart Materials and Structures Syllabus:
CAE354 Smart Materials and Structures Syllabus – Anna University Regulation 2021
COURSE OBJECTIVES:
Of this course are
1. To familiarize with the fundamentals of structural health monitoring.
2. To impart knowledge in the areas of Vibration based techniques in structural health monitoring, fibre optics and Piezo electric sensors.
3. To familiarize with the fundamentals of fabrication, modelling, analysis, and design of smart materials and structures.
4. To enable the student to get exposed to the state of the art of smart materials and systems, spanning piezo electrics, shape memory, alloys, electro active polymers.
5. To familiarize with artificial neural networks and image processing
UNIT I OVERVIEW AND INTRODUCTION
Piezoelectric Material Crystal Structure – Fundamentals of Piezoelectricity – Shape Memory Alloys – Fundamentals of Shape Memory Alloy (SMA) Behaviour – Phase Transformation – Lattice Structure and Deformation Mechanism – Electrostrictive Material Systems – ER and MR Fluids – Current Application – Aerospace Field – Machine Tools – Automotive Systems – Medical Systems – Electronics Equipment – Robots – Energy Harvesting Using Smart Materials.
UNIT II PIEZOELECTRIC THEORY
Electromechanical Constitutive Equations – Piezo ceramic Actuator & Sensor Equations – Piezoelectric Coupling Coefficients – Actuator Performance and Load Line Analysis – Hysteresis and Nonlinearities in Piezoelectric Materials – Piezo ceramic Actuators – Behavior under Static & Dynamic Excitation Fields – Depoling Behavior and Dielectric Breakdown – Curie Temperature – Power Consumption – Equivalent Circuits to Model Piezo ceramic Actuators – The Bimorph Sensor.
UNIT III BEAM MODELLING WITH PIEZOELECTRIC MATERIAL
Basic Definitions of Stress, Strains and Displacements in Beams – Transverse Deflection of Uniform Isotropic Beams – Simple Blocked Force Beam Model (Pin Force Model) – Single Actuator Characteristics – Dual Actuators – Symmetric & Asymmetric Actuation with Differential Voltages – Uniform Strain Model – Euler-Bernoulli Beam Model – Dissimilar Actuators – Embedded Actuators – Testing of a Beam with Surface Mounted Piezoactuators.
UNIT IV UNDERSTANDING SHAPE MEMORY ALLOYS (SMA)
Low Temperature Stress-Strain Curve – Origin of the One-Way Shape Memory Effect – Stress Induced Martensite and Pseudoelasticity – Two-Way Shape Memory Effect – All-Round Shape Memory Effect – R-Phase Transformation – Porous SMA – Constrained Behavior of SMA – Free Recovery – Constrained Recovery – Effective Load-Lines of an SMA Wire Actuator – Sample Preparation – Transformation Temperatures under Zero Stress.
UNIT V CONSTITUTIVE MODELLING AND SMA BEHAVIOUR
Tanaka Model – Liang and Rogers Model – Brinson Model – Testing of SMA Wires –Variation of Transformation Temperatures with Stress – Stress-Strain Behavior at Constant Temperature – Stress-Temperature Behavior at Constant Strain – Heat Absorbed by the SMA Wire – Thermomechanical Energy EquilibriumPower Requirements for SMA Activation – Resistance Behavior of SMA Wires – Heat Dissipation – SMA Wire Damping Capacity.
TOTAL: 45 PERIODS
COURSE OUTCOMES:
Upon completion of this course, Students will be able to
CO1: Classify the various forms of functional materials.
CO2: Investigate the Piezoelectric material behaviour.
CO3: Investigate the behaviour of SMA material.
CO4: Model a beam with Piezoelectric patch.
CO5: Impart knowledge on modelling of SMA material.
TEXT BOOKS:
1. Inderjit Chopra and Jayant Sirohi,’ Smart Structures Theory’, Cambridge University Press, 2014.
REFERENCES:
1. Martin, J.W., Engineering Materials, Their properties and Applications, Wykedham Publications (London) Ltd., 1987.
2. Prasad, N. Eswara, Wanhill, R. J. H, ‘Aerospace Materials and Material Technologies – Indian Institute of Metals Series, 2017.
3. Sam Zhang, ‘Aerospace Materials Handbook (Advances in Materials Science and Engineering) 1st Edition , 2016.
4. Van Vlack.L.H., Elements of Materials Science and Engineering Prentice Hall; Publishers, Sixth edition, 1989.