Abstract
A nanoscale representative volume element has been developed to investigate the effect of interphase geometry and property on the mechanical behavior of silica/epoxy resin nanocomposites. The role of interphase–matrix bonding was also examined. Results suggested that interphase modulus and interfacial bonding conditions had significant influence on the effective stiffness of nanocomposites, while its sensitivities with respect to both the thickness and the gradient property of the interphase was minimal. The stiffer interphase demonstrated a higher load-sharing capacity, which also increased the stress distribution uniformity within the resin nanocomposites. Under the condition of imperfect interfacial bonding, the effective stiffness of nanocomposites was much lower, which was in good agreement with the documented experimental observations. This work could shed some light on the design and manufacturing of resin nanocomposites.
Highlights
Resin-based composites possess good aesthetic properties and are currently among the most popular dental restorative materials [1]
It is observed that the effective stiffness predicted by the representative volume element (RVE) model was higher than that obtained from the D-I method
For the nanoparticle volume fraction of 10%, the effective stiffness predicted by the RVE model was 1.9% higher than that calculated by the D-I method
Summary
Resin-based composites possess good aesthetic properties and are currently among the most popular dental restorative materials [1]. Their wear resistance, hardness, and shrinkage behaviors are still a concern. Nanoparticle-reinforcement has become an effective technique to improve the mechanical performance of these composites [2,3]. It is widely accepted that the interphase can significantly affect the performance of nanocomposites, the reported interphase property and thickness vary from case to case [6,7,8]. Yu et al [9]
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