DENTING AND FRACTURE OF SHEET STEEL BY BLUNT AND SHARP OBSTACLES IN GLANCING COLLISIONS

Citation
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
Citations number
19
Categorie Soggetti
Engineering, Mechanical
ISSN journal
0734743X
Volume
21
Issue
7
Year of publication
1998
Pages
499 - 519
Database
ISI
SICI code
0734-743X(1998)21:7<499:DAFOSS>2.0.ZU;2-C
Abstract
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.