Results of static and dynamic penetration test of flat, conical and bu
llet shaped cylinders of three different diameters on both fragile and
ductile target media are presented. Empirical and theoretical express
ions for the variation of the penetration force with the penetrations
depth are given and the influence of the various governing factors dis
cussed. (C) 1998 Elsevier Science S.A. All rights reserved.