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    Prof Krishna Jonnalagadda PDF

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    pankaj
    Prof. Krishna Jonnalagadda leads a lab at IIT Bombay that studies polymer mechanics at the nanoscale and designs experiments to measure mechanical properties of materials from microns to millimeters. The lab developed microtensile testers to conduct in-situ experiments on ultra thin polymer films less than 100 times the diameter of a human hair. Previous work discovered orientation dependence in mechanical response that depends on the polymer's microstructure. A proposed PhD project will control polymer nanostructure through processing and test mechanical response to incorporate ultra thin films into MEMS applications like sensors and energy devices.

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    Prof Krishna Jonnalagadda PDF

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    pankaj
    146 views5 pages
    Prof. Krishna Jonnalagadda leads a lab at IIT Bombay that studies polymer mechanics at the nanoscale and designs experiments to measure mechanical properties of materials from microns to millimeters. The lab developed microtensile testers to conduct in-situ experiments on ultra thin polymer films less than 100 times the diameter of a human hair. Previous work discovered orientation dependence in mechanical response that depends on the polymer's microstructure. A proposed PhD project will control polymer nanostructure through processing and test mechanical response to incorporate ultra thin films into MEMS applications like sensors and energy devices.

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    Prof. Krishna Jonnalagadda leads a lab at IIT Bombay that studies polymer mechanics at the nanoscale and designs experiments to measure mechanical properties of materials from microns to millimeters. The lab developed microtensile testers to conduct in-situ experiments on ultra thin polymer films less than 100 times the diameter of a human hair. Previous work discovered orientation dependence in mechanical response that depends on the polymer's microstructure. A proposed PhD project will control polymer nanostructure through processing and test mechanical response to incorporate ultra thin films into MEMS applications like sensors and energy devices.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    146 views5 pages

    Prof Krishna Jonnalagadda PDF

    Uploaded by

    pankaj
    Prof. Krishna Jonnalagadda leads a lab at IIT Bombay that studies polymer mechanics at the nanoscale and designs experiments to measure mechanical properties of materials from microns to millimeters. The lab developed microtensile testers to conduct in-situ experiments on ultra thin polymer films less than 100 times the diameter of a human hair. Previous work discovered orientation dependence in mechanical response that depends on the polymer's microstructure. A proposed PhD project will control polymer nanostructure through processing and test mechanical response to incorporate ultra thin films into MEMS applications like sensors and energy devices.

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    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 5

    Polymer Mechanics at the Nanoscale

    Ultra Thin Films and MEMS Applications


    Prof. Krishna Jonnalagadda
    Mechanics of Materials Lab, Mechanical Engineering
    Indian Institute of Technology Bombay

    Krishna Jonnalagadda

    Experimental Mechanics at Microscale


    In our lab at IIT Bombay, we design, develop and conduct
    experiments on various materials to study deformation
    and mechanical response at microscale
    Aim is to measure properties, understand structureproperty correlation, and develop constitutive models
    over wide range of length scales: micron to mm
    Most of our experiments are conducted with in situ
    measurements, which give direct evidence of the failure
    in materials
    PhD Project Topic: Mechanical and structural
    investigation of ultra thin polymer films for MEMS
    applications
    Krishna Jonnalagadda

    Mechanical Behavior of Polymer MEMS

    Polymer MEMS Sensors/Devices

    Polymer Structure

    Microtensile Tester

    We use lithography to make the thin film samples


    This allows us to accurately control the geometry
    and microstructure

    Our lab designed and developed a microscale UTM to


    conduct experiments on very small samples

    The specimen thickness is 1/100 of human hair


    diameter

    Using this setup we can conduct in situ experiments


    under any kind of microscope including SEM

    Krishna Jonnalagadda

    Robin, Vishnoi, Jonnalagadda, JMEMS, 2014

    Previous Work Resolution and Structural Anisotropy


    F Tangential
    Radial

    (above) A typical example of the kind of displacement resolution


    that our technique can achieve. The vertical bands show the
    displacement in microns in the loading direction
    (top right) Si Wafer with polymer specimens spread out in the radial
    and tangential directions
    (bottom right) orientation dependence of mechanical response
    discovered by our lab and corroborated with spectroscopic
    investigation.
    This orientation dependence is crucial for the design of the MEMS
    devices as many functions are sensitive to material properties
    Krishna Jonnalagadda

    Robin, Vishnoi, Jonnalagadda, JMEMS, 2014

    Anisotropy in Multi-Layered Films


    Using the idea polymer composites laminae,
    we prepared multilayered films and found
    that their properties are better

    This idea has lead to the proposed PhD


    project on ultra thin polymer films

    Robin and Jonnalagadda

    PHD Project:
    In this project we will control the structure of the polymer at the nano-scale
    through processing to investigate its mechanical response via micro/nano
    scale experiments

    These nano-scale polymer films will then be incorporated into various MEMS
    applications, such as, sensor, energy harvesting devices, fuel cells, etc.

    Krishna Jonnalagadda

    Robin, Jonnalagadda , Unpublished

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