IMPACT STRENGTH AND RESPONSE OF PROTECTED BRITTLE MODELS OF DEEP SUBMERGENCE STRUCTURES.
Research and development rept.,
NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER WASHINGTON D C STRUCTURAL MECHANICS LAB
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Hemispherical shell models of deep-submergence structures and full-thickness plate brittle specimens protected by viscoelastic strain-attenuating material Adiprene were subjected to impact by spherical faced projectiles weighing from less than 0.1 to 1100 lb at velocities up to 30 ftsec. Maximum tensile strain amplitudes in shells were reduced by a factor of 10 or better and contact failures were eliminated by the use of Adiprene. Maximum tensile strains at failure were from 1000 to 2300 micro-inin for annealed glass plates, and from 3400 to 5800 micro-inin for chemically strengthened Herculite glass plates glass-reinforced plastic plates could not be damaged except for crazing cracks between parallel adjacent fibers on the tension surface. Scaling relationships and empirical strain functions for predicting maximum tensile strains in large prototype shells were developed. Data and empirical functions were checked against impact and shell theories of Hertz and Reissner with fairly good agreement resulting. Author
- Marine Engineering