Indentation size effect of thermoset polymer: Allyl diglycol carbonate (CR-39)

摘要

Microhardness testing is a well established technique for assessing the resistance of materials to deformation. Although the stress field developed in the rnaterial during indentation is much more complex than in conventional tests, and is not completely linderstood, certain features in indentation tests can be related to the mechanical properties of materials, siach as strength, brittleness and viscoelasticity. The deformation involved in the indentation process is related to abrasive scratching, wear and cutting. For ceramics and glasses, developments in the understanding of indentation mechanisms and associated localized cracking for brittle materials have led to a renewed interest in rnicroindentation techniques for measuring the fracture toughness of these materials [1-3]. For polymers, hardness studies and attempts to relate hardness to yield stress have been made [4-6].