In this study, the effect of moderate magnetic fields on the microstructure of a structural epoxy system was investigated. The changes in the microstructure have been quantitatively investigated using wide angle X-ray diffraction (WAXD) and pole figure analysis. The mechanical properties (modulus, hardness, and strain rate sensitivity parameter) of the epoxy system annealed in the magnetic field were probed with the aid of instrumented nanoindentation, and the results are compared to the reference epoxy sample. To further examine the creep response of the magnetically annealed and reference samples, short 45 min duration creep tests were carried out. An equivalent to the macroscale creep compliance was calculated using the aforementioned nanocreep data. Using the continuous contact compliance (CCC) analysis, the phase lag angle, tan (δ), between the displacement and applied force in an oscillatory nanoindentation test was measured for both neat and magnetically annealed systems through which the effect of low magnetic fields on the viscoelastic properties of the epoxy was invoked. The comparison of the creep strain rate sensitivity parameter, A/d(0), from short term(80 s), creep tests and the creep compliance J(t) from the long term (2700 s) creep tests with the tan (δ) suggests that former parameter is a more useful comparative creep parameter than the creep compliance. The results of this investigation reveal that for the epoxy system cured under low magnetic fields both the quasi-static and viscoelastic mechanical properties have been improved.
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January 2012
Bridging Microstructure, Properties, And Processing Of Polymer-Based Advanced Materials
Effect of Moderate Magnetic Annealing on the Microstructure, Quasi-Static, and Viscoelastic Mechanical Behavior of a Structural Epoxy
Mehran Tehrani,
Mehran Tehrani
Department of Engineering Science and Mechanics, Virginia Tech
, Blacksburg, VA 24061
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Marwan Al-Haik,
e-mail: alhaik@vt.edu
Marwan Al-Haik
Department of Engineering Science and Mechanics, Virginia Tech
, Blacksburg, VA 24061
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Hamid Garmestani,
Hamid Garmestani
School of Materials Science and Engineering, Georgia Institute of Technology
, Atlanta, GA 30332
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Dongsheng Li
Dongsheng Li
Pacific Northwest National Laboratory, 902 Battelle Boulevard, P.O. Box 999, MSIN K7-90
, Richland, WA 99352
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Mehran Tehrani
Department of Engineering Science and Mechanics, Virginia Tech
, Blacksburg, VA 24061
Marwan Al-Haik
Department of Engineering Science and Mechanics, Virginia Tech
, Blacksburg, VA 24061e-mail: alhaik@vt.edu
Hamid Garmestani
School of Materials Science and Engineering, Georgia Institute of Technology
, Atlanta, GA 30332
Dongsheng Li
Pacific Northwest National Laboratory, 902 Battelle Boulevard, P.O. Box 999, MSIN K7-90
, Richland, WA 99352J. Eng. Mater. Technol. Jan 2012, 134(1): 010907 (10 pages)
Published Online: December 14, 2011
Article history
Received:
March 10, 2011
Revised:
July 29, 2011
Online:
December 14, 2011
Published:
December 14, 2011
Citation
Tehrani, M., Al-Haik, M., Garmestani, H., and Li, D. (December 14, 2011). "Effect of Moderate Magnetic Annealing on the Microstructure, Quasi-Static, and Viscoelastic Mechanical Behavior of a Structural Epoxy." ASME. J. Eng. Mater. Technol. January 2012; 134(1): 010907. https://doi.org/10.1115/1.4005406
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