Abstract
Carbon fiber composites display considerable heterogeneity in strength and stiffness depending on the respective constituent properties, reinforcement alignments, and interfacial relationships. Typically the inherent material anisotropy and complexity lead to relatively diverse material fatigue failures depending on the loading conditions and carbon fiber reinforcement orientations. The current work seeks to better understand the mechanisms by which fatigue damage precipitates and the smallest scales (sub-micron) at which material phenomena may be observed and tracked before becoming observable on the millimeter scale or larger. Unidirectional IM7-8552 composite samples were fabricated for transverse (90°) and longitudinal (0°) fiber loading. Samples were tested in bending using a three-point set-up and in single axis tension developing the cyclic life response at several loading stresses. Baseline and failed samples were partitioned and polished for instrumented indentation and atomic force microscopy (AFM) which probed the local mechanical and morphological behavior of the composite interphase. Attempts are made to characterize the local material behavior around the fiber-matrix interphase to understand material response of this region with respect to fatigue cycling. The fiber-matrix interphase results are compared to numerical modelling in order to better understand the interphase behavior and fatigue degradation of the composite materials.
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FG is a contractor to the US Army Research Laboratory under Cooperative Agreement W911NF-16-2-0182.
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Henry, T.C., Cole, D.P., Gardea, F., Haynes, R.A. (2018). Interphase Mechanics in Fatigued Carbon Fiber Composite Materials. In: Starman, L., Hay, J. (eds) Micro and Nanomechanics, Volume 5. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-63405-0_5
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DOI: https://doi.org/10.1007/978-3-319-63405-0_5
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