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Article

Estimating Low- and High-Cyclic Fatigue of Polyimide-CF-PTFE Composite through Variation of Mechanical Hysteresis Loops

1
Laboratory of Mechanics of Polymer Composite Materials, Institute of Strength Physics and Materials Science of Siberian Branch of Russian Academy of Sciences, 634055 Tomsk, Russia
2
Department of Materials Science, Engineering School of Advanced Manufacturing Technologies, National Research Tomsk Polytechnic University, 634050 Tomsk, Russia
*
Author to whom correspondence should be addressed.
Academic Editor: Bolv Xiao
Materials 2022, 15(13), 4656; https://doi.org/10.3390/ma15134656
Received: 31 May 2022 / Revised: 21 June 2022 / Accepted: 28 June 2022 / Published: 2 July 2022
The fatigue properties of neat polyimide and the “polyimide + 10 wt.% milled carbon fibers + 10 wt.% polytetrafluoroethylene” composite were investigated under various cyclic loading conditions. In contrast to most of the reported studies, constructing of hysteresis loops was performed through the strain assessment using the non-contact 2D Digital Image Correlation method. The accumulation of cyclic damage was analyzed by calculating parameters of mechanical hysteresis loops. They were: (i) the energy losses (hysteresis loop area), (ii) the dynamic modulus (proportional to the compliance/stiffness of the material) and (iii) the damping capacity (calculated through the dissipated and total mechanical energies). On average, the reduction in energy losses reached 10–18% at the onset of fracture, whereas the modulus variation did not exceed 2.5% of the nominal value. The energy losses decreased from 20 down to 18 J/m3 (10%) for the composite, whereas they reduced from 30 down to 25 J/m3 (17%) for neat PI in the low-cycle fatigue mode. For high-cycle fatigue, energy losses decreased from 10 to 9 J/m3 (10%) and from 17 to 14 J/m3 (18%) for neat PI and composite, respectively. For this reason, the changes of the energy losses due to hysteresis are of prospects for the characterization of both neat PI and the reinforced PI-based composites. View Full-Text
Keywords: polyimide; milled carbon fibers (MCF); polytetrafluoroethylene (PTFE); polymer composite; fatigue analysis; mechanical testing; hysteresis loop polyimide; milled carbon fibers (MCF); polytetrafluoroethylene (PTFE); polymer composite; fatigue analysis; mechanical testing; hysteresis loop
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MDPI and ACS Style

Panin, S.V.; Bogdanov, A.A.; Eremin, A.V.; Buslovich, D.G.; Alexenko, V.O. Estimating Low- and High-Cyclic Fatigue of Polyimide-CF-PTFE Composite through Variation of Mechanical Hysteresis Loops. Materials 2022, 15, 4656. https://doi.org/10.3390/ma15134656

AMA Style

Panin SV, Bogdanov AA, Eremin AV, Buslovich DG, Alexenko VO. Estimating Low- and High-Cyclic Fatigue of Polyimide-CF-PTFE Composite through Variation of Mechanical Hysteresis Loops. Materials. 2022; 15(13):4656. https://doi.org/10.3390/ma15134656

Chicago/Turabian Style

Panin, Sergey V., Alexey A. Bogdanov, Alexander V. Eremin, Dmitry G. Buslovich, and Vladislav O. Alexenko. 2022. "Estimating Low- and High-Cyclic Fatigue of Polyimide-CF-PTFE Composite through Variation of Mechanical Hysteresis Loops" Materials 15, no. 13: 4656. https://doi.org/10.3390/ma15134656

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