Creep behaviour prediction of multi-layer graphene embedded glass fiber/epoxy composites using time-temperature superposition principle

This article focuses on the prediction of the impact of multi-layer graphene (MLG) reinforcement on the mechanical performance of glass fiber/epoxy composites. Flexural tests have been performed at different temperatures (-196, 30, 70 and 110 degrees C). Composite with 0.1 wt.% MLG showed superior flexural performance at 196 degrees C, due to the generation of cryogenic clamping stress at the MLG/polymer interface. Long-term (upto one billion years) creep performance at relatively low temperature (30 degrees C) has been predicted using accelerated deformation at elevated temperatures and time -temperature superposition principle. It is revealed that MLG exhibits positive reinforcement efficiency even upto one billion years at 30 degrees C, after which it is negated and gradually becomes negative. However, this time span gets reduced at elevated temperatures due to the generation of unfavourable thermal stress at the MLG/polymer interface. Thermal characterization has also been conducted using Dynamic Mechanical Analysis, Thermo-gravimetric analysis and Differential Scanning Calorimetry.