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MS Thesis Adekunle Samuel Falola.pdf (6.67 MB)

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MECHANICAL CHARACTERIZATION – MONOTONIC MICRO-TENSILE, STRESS RELAXATION, AND STRAIN-CONTROLLED CYCLIC STRESS-STRAIN RESPONSES OF SINGLE ELECTROSPUN PVDF NANOFIBERS

Falola, Adekunle Samuel
http://rave.ohiolink.edu/etdc/view?acc_num=akron1564557199987647

Abstract Details

2019, Master of Science, University of Akron, Mechanical Engineering.
There is a fast-growing demand for electrospun nanofibers as the choice materials for several technological applications. They typically have large surface area to volume ratio, high porosity meshes, small pore size distribution, structural strength, lightweight, and toughness, all of which enhances their mechanical properties. The nano-scale mechanical behavior of the material, particularly those properties that may influence performance of components made from these materials were investigated. Single electrospun PVDF nanofiber samples were tested for monotonic micro-tensile, stress relaxation, and cyclic stress-strain fatigue behavior. The preliminaries of this study involved electrospinning of PVDF (DMF/ACE 3:1) nanofibers. In the process, a novel method for collection and isolation of single electrospun nanofibers was developed. The single PVDF nanofiber samples showed characteristics non-Hookean behavior and size-dependent properties when pulled for micro-tensile tests. The repetitive stress relaxation of the single electrospun PVDF nanofiber samples showed that the samples sets resulting in decline in cumulative performances. The smaller sized, 0.86μm, single fiber displayed better stress relaxation capability when compared to the 1.07μm sample. The S-N plots obtained from the cyclic stress-strain showed that larger sized PVDF single nanofiber samples, which have higher yield strength, displayed higher S-N curve when compared to the smaller sized samples. The manner of failure and mechanisms during cyclic stress-straining are rather complex. An analysis of the images after cyclic straining revealed that the samples developed features that may be caused by molecular birefringence or fiber fragmentation.
Shing-Chung Wong, Dr. (Advisor)
Todd Blackledge, Dr. (Committee Member)
Xiaosheng Gao (Committee Member)
140 p.
Materials Science; Mechanical Engineering; Polymers
Single Electrospun Nanofibers; Mechanical Characterization; Stress Relaxation; Micro-Tensile; Cyclic Stress-Strain; Fatigue of Nanofibers; Electrospinning

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Citations

  • Falola, A. S. (2019). MECHANICAL CHARACTERIZATION – MONOTONIC MICRO-TENSILE, STRESS RELAXATION, AND STRAIN-CONTROLLED CYCLIC STRESS-STRAIN RESPONSES OF SINGLE ELECTROSPUN PVDF NANOFIBERS [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1564557199987647

    APA Style (7th edition)

  • Falola, Adekunle. MECHANICAL CHARACTERIZATION – MONOTONIC MICRO-TENSILE, STRESS RELAXATION, AND STRAIN-CONTROLLED CYCLIC STRESS-STRAIN RESPONSES OF SINGLE ELECTROSPUN PVDF NANOFIBERS. 2019. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1564557199987647.

    MLA Style (8th edition)

  • Falola, Adekunle. "MECHANICAL CHARACTERIZATION – MONOTONIC MICRO-TENSILE, STRESS RELAXATION, AND STRAIN-CONTROLLED CYCLIC STRESS-STRAIN RESPONSES OF SINGLE ELECTROSPUN PVDF NANOFIBERS." Master's thesis, University of Akron, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron1564557199987647

    Chicago Manual of Style (17th edition)

akron1564557199987647
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