Theoretical Terminal Ballistic Investigation and Studies of Impact at Low and Very High Velocities
Interim rept. 1 Mar 1967-29 Feb 1968
GENERAL ELECTRIC CO PHILADELPHIA PA MISSILE AND SPACE DIV
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The important parameters and failure modes pertinent to ballistic impact are discussed in detail and a review of available theoretical penetration formulas is presented. A method for a complete solution to the ballistic impact problem is outlined including the material model, numerical techniques, application of failure criteria and description of both post-failure material behavior as well as the residual state. Parametric studies based on this outline should reveal the necessary insight for developing predicitive relationships between the pre-impact and post-impact parameters. A complete solution is presented for the case of a steel cylinder impacting normally into a thin plate of like material. It is shown that predictions of stress wave propagation and reflections in the early stages of impact are in good agreement with one- dimensional theory. The shear stress, generalized plastic strain and plastic work distributions as well as the material flow pattern indicate that failure will be due to plugging, hence the employment of a maximum shear theory of failure.