Static and dynamic confined compression of Borosilicate glass

Borosilicate glass has been characterized at high pressures with the help of two different techniques. The first method was confined compression of a cylindrical sample at constant confinement pressure, also known as triaxial compression test. The second technique, the "sleeve test", consisted in confining the sample with a steel sleeve; in this method, the confinement pressure increases during the test. Maximum confinement pressures were around 400 MPa for the triaxial compression test and 1 GPa for the sleeve test. Intact and predamaged samples were tested. A limited number of samples were tested in the Hopkinson Bar to examine the influence of the strain rate on the behavior of borosilicate glass. The entire Hopkinson Bar system was modeled in 3-D with LS-DYNA. The results were analyzed to obtain both a Drucker-Prager and Mohr-Coulomb model. The advantage of the MC model over DP is that it can reproduce the failure pattern apparent in all the tests: the preferred failure angle, independently of the pressure applied is around 50 to 65 degrees.