A combined experimental and modeling study of low velocity perforation of thin aluminum plates
Simpson, Gary Forest Jr.
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This work conducts a combined experimental and modeling study of low velocity projectile perforation of thin AA5083-H116 aluminum plates. Experiments were performed in order to characterize the candidate material and calibrate simple and easy to implement empirical models for both the material response and ductile failure behavior. Quasi-static tensile tests were performed in order to investigate the Portevin-Le Chatelier effect common to 5xxx series aluminum as well as to calibrate a Ramberg-Osgood representation for the material stress-strain curve. The material response at strain rates up to and exceeding 104 s-1 was investigated by means of an electromagnetically driven ring expansion test, characterizing the potential strain rate sensitivity of the material. Additionally, the failure behavior and potential damage accumulation of the material were evaluated using an interrupted, multiple loading path strain-to-failure test, validating a Johnson-Cook failure model for use in numerical simulation. Low velocity ballistic impact and perforation experiments, investigating several specific mechanisms of deformation and failure, were conducted and modeled by implementing the developed material and failure model in 3D finite element simulations.