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Effects of complete freeze thaw on the flexural properties of e-glass/polymer pultruded composite
, J. Vaughan G., E. Lackey
Published in
Volume: 3
Pages: 1264 - 1281
Over the years many researchers have contributed to develop an understanding of moisture absorption behavior of different fiber reinforced composite systems under the influence of various internal factors (fiber volume fraction, fiber orientation, size of fiber reinforcement, moisture absorption nature of fiber and type of fiber etc.) and external factors (relative humidity, temperature of environment and the state of stress experienced by composites etc). In the present research the extent of degradation in flexural properties as a function of amount of absorbed moisture present in pultruded composite material is studied. Further, these results were compared with the effects of water and air freeze thaw on flexural properties of pre-conditioned (150 °F, 24 hours) and non-conditioned samples with and without prior absorbed moisture. For this study, one freeze thaw cycle was comprised of 8 hours of freezing and 16 hours of thawing. This ensured the complete freezing and thawing of the composite material during freeze thaw cycling. A set of samples with and without absorbed moisture were also subjected to room temperature aging. Statistical analysis of results obtained after water and air freeze thaw and room temperature aging was performed in accordance with MIL Handbook - 17. Results of this study indicate that the effect of amount of absorbed moisture on flexural strength is much greater than that of freeze thaw in water or air. However, as a result of drying during room temperature aging, samples with absorbed moisture are able to regain a significant portion of their flexural strength, which was lost due to ingress of moisture. Samples with higher moisture content (0.96%) also regain their strength as a result of drying in a vacuum oven.
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