Investigation on strain rate sensitivity of 3D printed sPEEK-HAP/rGO composites

Nanofillers can be added to polymers improve their mechanical behaviour. However, the yield behaviour of most polymer composites is influenced by strain rate. The majority research focused on at high rates. This work aims investigate how hydroxyapatite (HAP) and reduced Graphene Oxide (rGO) nanofillers affect properties sulphonated polyetheretherketone (sPEEK) low (tensile compression behaviour) rates (compression behaviour). thermal, mechanical, toughness responses sPEEK filled with HAP varying Mf rGO (0.5%, 1%, 1.5%) different are studied in detail. strong rate effect was seen loaded composites. sensitivity factor sPEEK-HAP/rGO increased but concentration. Under compression, absorbed approximately 4% more energy 1.5% than neat sPEEK. Higher concentration rGo (1.5%) withstood better melt processing, demonstrated excellent integrity inside sPEEK-HAP matrix. Increased density resulted lower composite characteristics, even MFI decreases as increases, which might resolve printing issues. compatibility between particles SEM images.