Characterization of Confined Intact and Damaged Borosilicate Glass

Abstract

This article 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–Coulomb (MC). The MC model is successful at predicting the damage pattern. An observation is that the slopes of the two models appear to be independent of the degree of damage (intact, predamaged, and severely damaged specimens). Lastly, these data are compared with flyer‐plate impact data of intact and damaged glass.

Mechanical Response of Borosilicate and Soda-Lime Glass Under Dynamic Triaxial Compression

“…To compare these experimental results with the quasistatic results in literature, we replotted the borosilicate and soda-lime glass results by Chocron et al [3,4], in Figs. 9 and 10, respectively, which are in the form of equivalent stress versus hydrostatic pressure.…”

“…7 and 8, hydrostatic pressure can be rewritten as P ¼ P c þ 1 3 r eq , where P c is the fluid confinement pressure applied axially and radially, and r eq is the principal stress difference at failure. Figure 9 shows r eq as a function of P for dynamic compression, dynamic triaxial compression, and quasi-static MTS experiments in comparison to Chocron et al [3] for borosilicate glass. The Similarly, Fig.…”

“…For example, Xu and Chen [1] studied the effects of loading rate, temperature, and damage effects on the compressive response of a borosilicate glass confined in sleeves of different materials. Chocron et al [2][3][4][5] investigated the effects of damage on the strength of a borosilicate (Borofloat 33 manufactured by Schott Glass) and a soda-lime glass (Starphire manufactured by PPG) under confinement. They used thermo-shocks to create initial damage in the glass specimens and then subject the specimens to quasi-static triaxial loading.…”

Testing boron carbide under triaxial compression

“…For the hydraulic bomb, the radial stress is the fluid pressure; for the confined sleeve, the radial stress is calculated from the hoop strain [9]. The hydrostatic pressure on the specimen is given by:…”

“…Chocron et al [9] recently used the technique to characterize intact and confined borosilicate glass.…”