THEORETICAL AND EXPERIMENTAL STUDY OF LOW VELOCITY PENETRATION PHENOMENA
Semiannual rept., Phases 3, 4, and 5
UTAH RESEARCH AND DEVELOPMENT CO INC SALT LAKE CITY
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A study of the strength of materials under large deformation was conducted. The sample to be tested was in the form of a thin disk and was crushed between a fixed and a moving anvil. Velocities ranging from 0.001 to 10,000 cmsec were obtained by driving the anvil either by a testing machine or by a compressed-air gun. A simplified analysis of the problem is given, and the assumptions used are discussed and compared with the experimental data. The relationship between internal energy of the material and deformation is found to be U T 1n z sub 0z where U is energy per unit mass, z sub o and z are initial and final thickness of the disk and T is a constant, the strength of the material. Variations in T are discussed in terms of strain-rate effects and strain-hardening effects. The materials tested were copper, 99.99 per cent pure aluminum, 6061-T4 and -T6 aluminum, Nylon, Lexan, Teflon, polyethylene and polypropylene.
- Manufacturing and Industrial Engineering and Control of Production Systems