Characterization of Borosilicate Glass Through Confined Compression Testing with Numerical Validation

摘要

This report describes two different techniques utilized to characterize intact and damaged borosilicate glass at pressures up to 2 GPa: triaxial compression and confined sleeve. The results of the characterization experiments-for intact and damaged glass as a function of confinement pressure- are described; the results are interpreted in terms of two pressure-dependent constitutive models: Drucker-Prager and Mohr-Columb. Both constitutive models predict correctly the stress-strain response in numerical simulations of the experiments. The Mohr-Coulomb is successful at predicting the damage pattern. An observation is that the slopes of the two models appears to be independent of the degree of damage (intact, predamaged and severely damaged specimens). The two models are then used to compute the penetration velocity of a gold rod into borosilicate glass as a function of impact velocity. From the penetration experiments it was found that the Drucker-Prager and Mohr-Coulomb models required a cap, and low values of the intercepts (zero-pressure values) to replicate the experiments.