RECENT DEVELOPMENTS IN ELASTIC-PLASTIC FRACTURE MECHANICS WITH PARTIUCLAR REFERENCE TO HETEROGENEOUS STRUCTURES

Karl-Heinz Schwalbe        

Anales de la Mecánica de la Fractura, nº 14 . 1997 . Pág. 30 -48
Ver (.pdf): Anales14-003

Resumen: The fracture parameters being used in EPFM are the J-integral and the crack tip opening displacement Methods are available for determining J and CTOD as driving force paramters as functions of applied load or strain. When using J and CTOD in testing for determining the fracture resistance of a material it is seen that they do not uniquely describe a material' s frncture behaviour. This is due to constraint effects which depend on a number of paramters, in particular geometrical parameters. Recently a further so urce of constraint effects has been extensively reported: if a crack is located near the interfuce between two mechanically dissimilar materials then the crack tip field may be distwbed, resulting in a variation in the driving force and constraint and hence crack growth resistance. Methods are being developed for determining the driving force and crack growth resistance under these circurnstances.

LocalizaciónRibadesella, Asturias

GKSS-Forschungszentrum Geesthacht. 21502 Geesthacht, Fed. Republic of Gennany