Cm. Muscatfenech et Ag. Atkins, DENTING AND FRACTURE OF SHEET STEEL BY BLUNT AND SHARP OBSTACLES IN GLANCING COLLISIONS, International journal of impact engineering, 21(7), 1998, pp. 499-519
The different types of denting, scoring and fracture that occur in ''g
lancing collisions'' between sheet steel and blunt or sharp obstacles,
have been investigated. These collisions have a component of motion a
long the surface of the sheet or plating as well as perpendicular to i
t, and are to be distinguished From the usual sort of penetration/perf
oration problem. Crack initiation for blunt obstacles occurs by in-pla
ne stretching and the biaxially dependent in-plane fracture strain pai
rs art: well described by the fracture-forming limit diagram. Crack in
itiation for sharp obstacles is less easy to put in terms of critical
strains, owing to the highly localised deformation regions. For both t
ypes of obstacle, crack propagation is modelled successfully using rig
id-plastic fracture mechanics. Applications to ship grounding, motor v
ehicle crashworthiness, etc., are discussed. (C) 1998 Elsevier Science
Ltd. All lights reserved.