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The ""twin-crack"" model and the T-criterion in predicting dynamic instability for asymmetric cracks
This item is provided by the institution :
National Technical University of Athens
Repository :
Digital Library of National Technical University of Athens | Dspace@NTUA
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ΕΚΤ item type
Journal part
(EN)
Scientific article
(EN)
EKT year
1992
(EN)
EKT historical period
Title
The ""twin-crack"" model and the T-criterion in predicting dynamic instability for asymmetric cracks (EN)
Creator
Kourkoulis, SK (EN)
Theocaris, PS (EN)
Andrianopoulos, NP (EN)
Description
The phenomenon of directional instability of running cracks is studied by means of a ""twin-crack"" model. The running single crack tip is simulated by a cloud of microcracks under the form of hackles with random lengths and orientations, which, finally, are reduced into a flat front with two dominant microbranches at their corners. A suitable fracture criterion is applied in its double geometry in order to predict the future behaviour of this pattern. The predictions obtained agree well with existing experimental evidence concerning branching angles and give strong indications that other instability phenomena (such as curving, kinking and arrest) could be approached through the same model. It is finally concluded that directional instability is governed by two groups of factors, deterministic (macroscopic) and stochastic (microscopic), and, thus, the existence of sharp critical instability conditions seems not to be natural. © 1992. (EN)
Type
journalArticle (EN)
Subject
Stresses (EN)
Microcracks (EN)
Fracture mechanics (EN)
Macroscopic crack branching (EN)
Statistical methods (EN)
Twin crack model (EN)
Stress intansity factors (EN)
Crack propagation (EN)
Geometry (EN)
Cracks (EN)
Asymmetric cracks (EN)
Mechanics (EN)
Dynamic Instability (EN)
Mathematical models (EN)
Dynamic instability prediction (EN)
Provider
National Technical University of Athens
Repository / collection
Digital Library of National Technical University of Athens | Dspace@NTUA
Subcollections
Κεντρική Βιβλιοθήκη Ε.Μ.Π.
Ιδρυματικό Αποθετήριο
Δημοσιεύσεις μελών Δ.Ε.Π. σε περιοδικά
Journal
Engineering Fracture Mechanics (EN)
Language
English
Issued
1992 (EN)
Identifier
http://hdl.handle.net/123456789/10829
2 (EN)
146 (EN)
0013-7944 (EN)
137 (EN)
10.1016/0013-7944(92)90117-W (EN)
ISI:A1992JP74800001 (EN)
43 (EN)
Publisher
PERGAMON-ELSEVIER SCIENCE LTD (EN)
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