Ductile branching modes in stable propagating cracks: An experimental study

 
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1990 (EN)
Ductile branching modes in stable propagating cracks: An experimental study (EN)

Theocaris, PS (EN)

N/A (EN)

An experimental study of the propagation of an edge crack in a polycarbonate plate under conditions of plane stress and mode I loading was undertaken in order to clarify phenomena of blunting, kinking, curving and branching of the propagated crack. Scanning electron microscope studies of the initiation of the ductile crack indicated clearly the decisive importance of the mode of blunting and kinking of the ductile crack before any steady state crack propagation. Previous experimental evidence showed the mode of plane stress blunting forming first a rounded-off flat crack front at its corners, which was followed by single or double kinking at the vicinities of the corners of flat front crack, which was evoluted either to a curving (when the single-kink phase was persisted) of the crack, or to a branching (when the double kink phase predominated). This initial branching was at the beginning following an exponential spiral slip-line, appertaining to the respective exponential spiral slip-line zone covering the front of the blunted crack, thus reducing progressively its angle of obliqueness. As the branches of the crack were receding from each other rather stable directions were established and the branches were propagating along these directions until another nucleus of a new branching was developing along the propagating cracks. The method of transmitted caustics gave an indication of the distribution of energies in the propagating branches and could be used for an exact calculation of these energies. Interesting phenomena related with the branching and curving of propagating cracks were divulged from this experimental study. © 1990. (EN)

journalArticle

Crack Kinking (EN)
Crack Branching (EN)
Polycarbonates--Crack Propagation (EN)
Crack Blunting (EN)
Experimental Study (EN)
Ductile Branching (EN)
Fracture Mechanics--Testing (EN)
Crack Curving (EN)
Plates (EN)

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

Engineering Fracture Mechanics (EN)

1990


PERGAMON-ELSEVIER SCIENCE LTD (EN)



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