Materials Science and Engineering, Statistics, Ames Laboratory
Journal or Book Title
Toolmarks produced by 44 sequentially manufactured screwdriver tips have been characterized for surface roughness using a profilometer. Toolmarks were produced in lead at angles of 30°, 60°, and 85°. A computer program developed to compare and match the profilometer data has been used to show that marks from a single tip produced at similar angles yield much higher correlation values than marks produced from the same tip but at different angles. This analysis provides statistical support for the widely-accepted empirical observation that toolmark striae must be reproduced at similar angles in order to be unambiguously identified as being made by a particular tool.
Faden, D.; Kidd, J.; Craft, J.; Chumbley, L. Scott; Morris, Max D.; Genalo, Lawrence; Kreiser, J.; and Davis, S., "Statistical Confirmation of Empirical Observations Concerning Tool Mark Striae" (2007). Materials Science and Engineering Publications. 212.