Localized Impact Damage in Ceramics. A. Localized Impact Damage in Glass. B. Localized Impact Damage in Stressed Members.

摘要

This technical report discusses (1) Localized Impact Damage in Glass --Glass plates were impacted by glass,steel and NYLON spheres at velocities up to 115 m/s. The impact sites were characterized and the remaining strengths were measured. Hertz cone crack depths were found to be much less than theoretical estimates. The cone angles increased with increasing impact velocity. Evidence of crack branching of cone cracks,and radial and lateral vent crack formation was observed at high impact velocities. (2) Localized Impact Damage in Stressed Members Glass plates were stressed biaxially in flexure and impacted by glass spheres. The impact sites were characterized --Impacts on tensile surfaces initiated damage at lower velocities and showed enhanced penetration compared with those on compressive surfaces. (Author)