Advanced material

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    22-Jul-2015
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    Engineering

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Transcript of Advanced material

  • ABSTRACT

    In the field of massive and complex manufacturing we are now in need of materials whose properties can be manipulated according to our need. Smart materials are one among those materials. This can change its shape or size by adding little bit of heat. This presentation focuses on smart material such has shape memory alloy and application.

  • INTRODUCTION

    Nature is full of magic materials which are to be discovered in forms suitable to our needs such magical materials also know as intelligent or smart materials can sense, process, stimulate and actuate response. Smart materials have one or more properties that can be dramatically altered. For example: if oil is heated it will become thinner, where as SM with variable viscosity and the fluid which flows easily to solid.

  • SMART MATERIAL AND THEIR CATEGORIZATIONSmart materials Materials that respond with significant change in a properties upon application of external driving forces-stimuli Smart Machines and Smart Structures are composed of smart materials.Ex of SM: pizoelectric materials, shape memory alloys, Magnetic shape memory, pH- sensitive polymers, photomechanical materials etc.

  • CATEGORIZATION OF SMART MATERIALBased on input and outputBased on action/functionBased on activationThermal fieldsMagnetic fields Electric fieldsMechanical fields

  • SHAPE MEMORY ALLOYS(SMA) Shape memory can remember their shape when heated above certain transition temperature Ex: Nitinol & copper- aluminum-nickel.Shape-memory alloys have different shape-memory effects. Two common effects are one-way and two-way shape memoryWorking:SMA change shape based on a solid state phase transformation and there is change in re arrangement of atoms.

  • LINEAR MOTION FROM SMAL1L1L2SMA at Low temperatureStretch the wire a low temperatureRemove force, new lengthApply heat, regain original lengthcoolhotRotational motion is also possible

  • SHAPE MEMORY EFFECT (2-WAY EFFECT)

  • WORKING OF SMA

  • TRANSFORMATION OF SMAheatingcoolingHigh TemperatureCubic StructuredeformationLow temperatureDeformedLow temperatureTwinned monoclinic StructureAppliedForce Force removedHigh temperatureLow temperatureAsMfAusteniteMartensite

  • SHAPE MEMORY ALLOYMEDICAL APPLICATIONSOrthodontic wire applications

  • SHAPE MEMORY ALLOY INDUSTRIAL APPLICATIONGreenhouse window systems which close/opendepending on the room temperature

  • NICKEL-TITANIUM SHAPE MEMORY ALLOYINDUSTRIAL APPLICATIONNiTi eyeglasses frame

  • NICKEL-TITANIUM SHAPE MEMORY ALLOYINDUSTRIAL APPLICATIONApplication of SMAs to an automatic oil-level-adjustment devicein high speed train

  • APPLICATION IN AIRCRAFT

    Location of smart material device used in aircrafts.1) Propeller2) Engine monitoring3) Flutter suppression and Flaps positioning4) Cabin noise reduction5) Central control unit

  • OTHER APPLICATION Cell phone antenna Eyeglasses Coffee pots Space shuttle

  • PROBLEMS WITH SMASFatigue from cyclingCauses deformations and grain boundariesBegin to slip along planes/boundariesOverstressA load above 8% strain could cause the SMA to completely lose its original austenite shapeMore expensive to manufacture than steel and aluminumRelatively new

  • CONCLUSIONS Smart materials like piezoelectric materials, shape memory alloys, magnetic shape alloy, PH-sensitive polymer, photo mechanical material can be used as actuators for many operation like in aircraft industries, medical industries etc. There fore deeper in site studies can result in better design and development of product smart material can develop smart product

  • REFERENCES

    Wikipedia.org.Shape Memory Alloys by Marek Novotny.General Applications of Shape Memory Alloys by Dr.Savas Dlbal.Shape Memory Alloy Research Team Dimitris C.Lagoudas.