Investigation of bullet penetration in ballistic gelatin via finite element simulation and experiment

다국어 초록 (Multilingual Abstract)

To qualitatively understand the deformation processes and damages in the human body caused by high-speed impact, we conductedexperimental and computational investigations for bullet penetration into viscoelastic ballistic gelatin blocks. Because it is difficult tomeasure the strain rate-dependent material properties of viscoelastic gelatin blocks during high-speed impact, the material properties thatare indirectly defined by the stress relaxation test were used for the computational simulation. We also conducted some firing experimentsand analyzed the deformation processes of the structures. In particular, the passing through times and the shapes of the temporaryand permanent cavities inside the ballistic gelatin blocks were analyzed and compared. This data reveals that the employed material models,with some modifications for the FE simulation, are sufficient for predicting the high-speed impact behaviors. To investigate theshapes of the permanent cavities and fragments made by bullets inside the gelatin blocks, two-dimensional sectional images were takenby an industrial CT scanner and a three-dimensional CAD model was constructed based on these images.

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