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Towards Developing a Technique to Produce Nanocomposites with Uniform Auxetic Behavior

Kamarsu, Prasanth R.
http://rave.ohiolink.edu/etdc/view?acc_num=toledo1310136514

Abstract Details

2011, Master of Science in Mechanical Engineering, University of Toledo, College of Engineering.
For the last 20 some years there has been a great increase of interest in a class of materials known as auxetic materials. An auxetic material is a material that has a negative Poisson's ratio, meaning that when an auxetic material is pulled on it expands instead of contracting, as is the case with most other materials. Due to these materials possessing a negative Poisson's ratio there is an improvement in the material properties, like the shear modulus and high impact resistance, which makes these materials very attractive for potential applications. There has been an extensive look at different ways to create these materials, with the most famous one being the auxetic foam created by Roderic Lakes in 1987. Most of these materials tend to be structurally weak, that is why the interest has shifted towards creating auxetic composites. With composites, one theory is that the auxetic network can be embedded in a stronger matrix material and still retains its auxeticity. Some of the research in auxetic composites that has been look at is the stacking sequence of laminate composites or using an auxetic fiber in a conventional matrix. Recently the interest has shifted towards randomly oriented fiber composites. Simulation of these networks has shown that compression of randomly oriented fiber networks forces these fibers to form into a structure that possesses an auxetic behavior. Experiments were conducted and were able to verify the simulation results, though without any consistent value Poisson's ratio. The research presented took what was done experimentally and tried to see if it was possible to control the amount of the compression or the thickness of these composite, along with the amount of fiber in order to produce a composite that has a uniform value of a negative Poisson's ratio. The result shows that the lower the fiber volume the easier it became to engage the auxetic network when compressed, though excessive pressure may result in loss of auxetic behavior
Lesley Berhan (Committee Chair)
Maria Coleman (Committee Member)
Yong Gan (Committee Member)
75 p.
Mechanical Engineering
auxetic; nanofibers; nanocomposites; negative Poisson's ratio; polymer

Recommended Citations

Citations

  • Kamarsu, P. R. (2011). Towards Developing a Technique to Produce Nanocomposites with Uniform Auxetic Behavior [Master's thesis, University of Toledo]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1310136514

    APA Style (7th edition)

  • Kamarsu, Prasanth. Towards Developing a Technique to Produce Nanocomposites with Uniform Auxetic Behavior. 2011. University of Toledo, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=toledo1310136514.

    MLA Style (8th edition)

  • Kamarsu, Prasanth. "Towards Developing a Technique to Produce Nanocomposites with Uniform Auxetic Behavior." Master's thesis, University of Toledo, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1310136514

    Chicago Manual of Style (17th edition)

toledo1310136514
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© 2011, all rights reserved.
This open access ETD is published by University of Toledo and OhioLINK.