Time-dependent properties of newly developed multiscale UHMWPE composites

Tribological performance of aUHMWPE‐based multiscale composite under different lubrication and loads

“…Presence of GO and ND aided in lowering friction while SCFs carried the load and protected the matrix/composite surface from wear 40 . Inclusion of all the reinforcements resulted in an improvement in mechanical properties when compared to inclusion of just one type of reinforcement to UHMWPE 51 …”

“…40 Inclusion of all the reinforcements resulted in an improvement in mechanical properties when compared to inclusion of just one type of reinforcement to UHMWPE. 51 The loading quantity of the reinforcements was also based on research already conducted. 39 The Multiscale composite consisted of 0.5 wt% GO, 0.5 wt% ND and 10 wt% SCF.…”

Time‐dependent properties of high‐density polyethylene with wood/graphene nanoplatelets reinforcement

“…Short-term creep tests were performed on a single specimen of each material formulation. One creep test consists of multiple loading ramps at a rate of 3.5 mm/min (based on extensometer) to specific stress for increasing time intervals interrupted by strain recovery steps following the procedure described in [21,24] as shown in Figure 1A. Specimens were loaded to the predefined stress, held at that stress for a time t 1 where creep strain is observed, then unloaded to almost zero load level (4 N) to recover the reversible strains and held at that load for a time 8t 1 .…”

“…Previous investigations on hybrid reinforced materials with lower reinforcement content (up to 11%) did not show such deviations. [21] This suggests the need to find more reliable means to identify and evaluate the damage, where damage can be separated from VP strain to study the interaction between damage and the development of VP strains in more detail. A new approach is currently examined to advance the modeling procedure followed here and investigate the time effect on the development of VP strains.…”

“…These functionalities require rather large amounts of the nanoparticles to form the conductive network in the thermoplastic matrix [17] which results in a great change of the polymer microstructure. They have also been reported to have a significant effect on the time-dependent performance of a variety of polymers [21][22][23][24] and advanced polymer composites of carbon and glass fibers. [25,26] Due to the impracticality to obtain experimental data for long-term performance, a common practice is to perform a short-term test and describe the captured material behavior with models to predict the behavior at different test conditions.…”