technical seminar on smart materials and smart systems & ss f.pptx

smart systems

1. TECHNICAL SEMINAR ON “SMART MATERIALS & SYSTEMS” PANKAJ Roll no. 09161010 M.TECH .(IPD&M ) Dept. of mechanical engg.& tech. Guru Jambheshwar university of science & technology (Hisar )

2. INTRODUCTION Smart Materials Smart Systems Dumb Materials & Biomimetics CONTENTS Types of smart materials Examples of Biomimetics Examples of Smart systems

3. Smart materials SMs referred to materials having functions such as sensibility, micro processing and actuation “Intelligent Materials” Senses a stimulus (eyes). Takes an intelligent decision (brain). Through electronic feedback it takes corrective/preventive measures to avoid catastrophic situations (arm). One of the emerging materials in today’s developments of material S&T

4. SMART SYSTEMS Concept indicate few more special functions which are not being found in traditional structural materials Comprises smart materials comprises of basic components sensor, actuator and Control unit

5. Dumb materials and Biomimetics Dumb materials have been preprocessed and/or designed to offer only a limited set of responses to external stimuli. inspiration rather than imitation” “design inspired by nature”   Dumb’ materials and structures contrast sharply with the natural world where animals and plants have the clear ability to adapt to their environment in real time Biomimetics

6. pine-cone model adapts to changing temperatures by opening when warm or shutting tight if cold Example of Biomimetics

7. special alignment and grooved structure of tooth-like scales embedded in shark skin decrease drag and thus greatly increase swimming proficiency Airbus fuel consumption down 1½% when “shark skin” coating applied to aircraft EXAMPLES OF BIOMIMETICS Drag reduction by shark skin

8. Lotus effect most efficient self-cleaning plant = great sacred lotus mimicked in paints and other surface coatings pipe cleaning in oil refineries (Norway) EXAMPLES OF BIOMIMETICS

9. Types of Smart Materials Shape memory alloys. Piezoelectric m aterials Magnetostrictive and Electrostrictive materials Active fluids Ph and temperature sensitive polymers. Optical fibres

10. TWO TYPES OF COMMON EFFECTS ARE: ONE WAY EFFECT TWO WAY EFFECT SHAPE MEMORY ALLOY INITIAL STATE DEFORMED SHAPE HEATING BACK TO ORIGINAL SHAPE SMA is a material having ability to return to its previous shape after being deformed by temperature changes or by just releasing the stress. Example: Nitinol TiNi , copper-Zinc , copper -Tin

11. Piezoelectric Materials Piezoelectric Effects : Electric charge is created when material is mechanical stressed Piezo = Pressure Piezoceramics are the most widely used smart material Applications Medical Diagnostics. High frequency stereo-speakers. Computer Keyboards. Microphones.

12. Magnetostrictive and Electrostrictive materials Electrostrictive & Magnetostrictive : A swift , linear shape change ( expand or contract ) in response to an electric field/Magnetic field , instantly Movement generated due to forces b/w magnetic poles Expansion in presence of electric fields Applications High-power sonar transducers. Motors., Hydraulic actuators. Examples : Metglass , Terfenol -D Lead magnesium niobiate

13. ACTIVE FLUIDS Applications Tunable dampers. Vibration-isolation systems. Clutches. Brakes. Resistance Controls Respond to an electric or a magnetic field with a change in viscosity Examples : Electrolytes , polar fluids

14. pH AND TEMPERATURE SENSITIVE POLYMERS pH-sensitive polymers are materials which swell/collapse when the pH of the surrounding media changes. Temperature-responsive polymers are materials which undergo changes upon temperature. Used as surface modifiers , drug delivery Examples :ethyl acrylamide (EAAm) 

15. Optical Fibres Fibres that use intensity, phase, frequency or polarization of modulation to measure strain, temperature, electrical/magnetic fields, pressure and other measurable quantities

16. Smart Systems : AIR BAGS IN CARS

17. Smart Systems Locations of Potential Smart Systems in an Aircraft

18. Smart System : Smart Bridge

19. The Future The development of true smart materials at the atomic scale is still some way off, although the enabling technologies are under development. Worldwide, considerable effort is being deployed to develop smart materials and structures. The technological benefits of such systems have begun to be identified and, demonstrators are under construction for a wide range of applications from space and aerospace, to civil engineering and domestic products