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.
The behavior of metal foams under rapid loading conditions is assessed. Dynamic loading experiments were conducted in our laboratory using a split Hopkinson pressure bar apparatus and a drop weight tester; strain rates ranged from 45 s−1 to 1200 s−1. The implications of these experiments on open-cell, porous metals, and closed- and open-cell polymer foams are described. It is shown that there are two possible strain-rate dependent contributors to the impact resistance of cellular metals: (i) elastic-plastic resistance of the cellular metal “skeleton,” and (ii) the gas pressure generated by gas flow within distorted open cells. A theoretical basis for these implications is presented.
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