Understanding the response of aluminosilicate and aluminoborate glasses to sharp contact loading using molecular dynamics simulation

摘要: Experimental studies have shown that glass systems with high boron content exhibit superior crack resistance under sharp contact loading. However, the underlying mechanism is still not fully understood. In this context, we carried out classical molecular dynamics simulations on sodium aluminosilicate and aluminoborate to investigate effect of response nanoindentation. A rigid V-shaped indenter used indent sample a fixed loading rate, during which interacts via repulsive force field. The angle tip radius are varied study sharpness, as what has been done in experiments. These simulated nanoindentation tests reveal how stress/strain field structure evolve deformation underneath indenter. It was found large number atoms plastic zone change from three- fourfold coordination process, most them revert back threefold state unloading process. Our shows “reversible” plays critical role increasing damage glass.