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Effect of twist on load transfer and tensile strength in carbon nanotube bundles.

Parlapalli, Rohit
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1382372894

Abstract Details

2013, MS, University of Cincinnati, Engineering and Applied Science: Mechanical Engineering.
The discovery of Carbon Nanotubes (CNTs) has sparked tremendous interest among the scientific community due to its extraordinary mechanical properties like high strength and elastic modulus and semiconductor like properties. Though spinning the CNTs into continuous yarns enabled the use of CNTs at macroscale, current spinning techniques are not able to reproduce the properties comparable to those observed at nanoscale. Motivated by this gap, a modeling approach is established to address the subject of transferability of the high strength properties from individual CNT to carbon nanotube (CNT) yarns. More specifically, a number of key factors that contribute to the reduced strength of the twisted CNT yarns are investigated. First of all, the effects of Stone-Wales defects on the strength of individual nanotubes are studied. It is found that the tensile strength of the individual CNT is not highly sensitive to the Stone-Wales defects even with relatively high ratio of defects percentage. Subsequently, molecular dynamics and mechanics simulation are performed to evaluate the load transfer mechanism and tensile strength in a bundle of CNTs. The goal is to find the most favorable twist angle for maximum tensile strength and maximum load transfer ability in between the CNTs in CNT bundles. Both small and large bundles have been studied to examine whether the results are scalable. This thesis concludes with a comparison of the simulation results with the analytical studies based on the mechanics of ropes.
Dong Qian, Ph.D. (Committee Chair)
Yijun Liu, Ph.D. (Committee Member)
Mark Schulz, Ph.D. (Committee Member)
97 p.
Nanotechnology
carbon nanotubes; molecular dynamics; twist in carbon nanotubes; lammps; carbon nanotube ropes; carbon nanotube yarns

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Citations

  • Parlapalli, R. (2013). Effect of twist on load transfer and tensile strength in carbon nanotube bundles. [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1382372894

    APA Style (7th edition)

  • Parlapalli, Rohit. Effect of twist on load transfer and tensile strength in carbon nanotube bundles. 2013. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1382372894.

    MLA Style (8th edition)

  • Parlapalli, Rohit. "Effect of twist on load transfer and tensile strength in carbon nanotube bundles." Master's thesis, University of Cincinnati, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1382372894

    Chicago Manual of Style (17th edition)

ucin1382372894
827
© 2013, all rights reserved.
This open access ETD is published by University of Cincinnati and OhioLINK.