Effects of temperature and loading speed on interface-dominated strength in fibre/polymer
composites: An evaluation for in-situ environment Sanghamitra Sethi, Dinesh Kumar Rathore, Bankim Chandra Ray,
Department of Metallugical and materials Engg.
he influence of crosshead velocity and in-situ environmental conditioning i.e.
high temperature and cryogenic temperature on micromechanical performance of
glass fiber/epoxy, carbon fiber/epoxy and Kevlar fiber/epoxy polymer composites
has been studied. 3-point short beam shear tests were
conducted on the conditioned specimens to evaluate the interfacial properties
and failure modes which are related to mechanical properties of the composites.
The effect of crosshead velocity (within the range 1-103 mm/min) on the interlaminar
shear strength (ILSS) of all the three composite systems at different temperatures
was studied. The glass transition temperature (Tg) of conditioned samples was measured
by differential scanning calorimetry (DSC) in the ¬¬¬temperature range of 25°C to 150°C
temperature. At 1 mm/min loading rate, for both glass/epoxy and carbon/epoxy composites
the maximum increase in ILSS value was about 85.72% with respect to ambient, while for
Kevlar/epoxy composite 31.77% reduction in ILSS was observed at -100°C temperature.
More in Materials and Design DOI- 10.1016/j.matdes.2014.09.053
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