Abstract
This paper discusses a semi-empirical method, based on the simple Lambert and Jonas (LJ) formula to predict the remaining velocity of a bullet perforating a thin metal sheet. This paper focuses on ordinary FMJRN 1 1 Full Metal Jacketed Round Nose. , FMJTC 2 2 Full Metal Jacketed Truncated Cone. and LRN 3 3 Lead Round Nose. pistol and revolver bullets, which generally deform at impact and considers ‘thin’ steel targets ( h/d 0<0.2 ) which frequently occur in forensic case work. The original parameters of the LJ-formula are substituted by parameters of the target, the perforator and four non-dimensional fitting parameters which were determined by the method of non-linear regression, applying experimental data. It was found that the number of necessary model parameters could be reduced to only two for the angular impact of FMJ and three for LRN bullets.
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