SEM investigations fo slip-line fields around blunted cracks under mixed-mode conditions

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1990 (EN)
SEM investigations fo slip-line fields around blunted cracks under mixed-mode conditions (EN)

Kytopoulos, V (EN)
Theocaris, PS (EN)

N/A (EN)

The slip-line field around the tips of cracks was studied using electron scanning microscopy. Thin and thick tension specimens made of polycarbonate were edge-cracked ensuring predominant conditions of either plane stress or plane strain. The evolution of blunting and creation of the slip-line field in the intermediate phase between blunting and initiation of slow propagation of the crack were studied under a continuously increasing loading mode. Blunting depends on the type of stress state (plane stress or plane strain), mode of loading (mode I, mixed mode), and ductility of the material. Three different types of blunting were detected, the already known round-nosed and flat-nosed modes and an intermediate type of cornered and rounded-off front of the crack. The characteristic properties are presented. The slip-line fields accompanying blunting and indicating the initiation and evolution of the plastic enclaves were detected in all types of loading and specimens using the brittle-coating technique and its variations. It is shown that not only the plastic enclaves developed during this step of loading but also the significant elastic components of stresses influence the mode of development of the respective slip-line yielding a combined type in between the Rice-Johnson field for plane strain and the Theocaris field for plane stress. (EN)


Crack Opening Displacement (EN)
Bisphenol A (EN)
Fracture Mechanics (EN)
Polycarbonates (EN)
Microscopic Examination--Scanning Electron Microscopy (EN)
Crack Tip Blunting (EN)

Εθνικό Μετσόβιο Πολυτεχνείο (EL)
National Technical University of Athens (EN)

Journal of Materials Science (EN)




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