ΦΑΙΝΟΜΕΝΑ ΑΣΤΑΘΕΙΑΣ ΤΗΣ ΔΙΕΥΘΥΝΣΕΩΣ ΤΑΧΕΩΣ ΚΙΝΟΥΜΕΝΩΝ ΡΩΓΜΩΝ

IN THE PRESENT DISSERTATION THE PHENOMENA OF DYNAMIC CRACK INSTABILITY ARE STUDIED FOR FAST RUNNING CRACKS. THESE PHENOMENA ARE: DYNAMIC BRANCHING, DYNAMIC CURVING, DYNAMIC KINKING AND CRACK ARREST. A SERIES OF EXPERIMENTS PROVES THAT THE EXISTING "YOTTE MODE" FOR APPLYING MACROSCOPIC FRACTURE CRITERIA FAILS TO GIVE CORRECT RESULTS IN THE CASE OF MOVING CRACKS. A NEW MODE FOR APPLYING THESE CRITERIA IS PROPOSED AND DESCRIBED IN THE SEQUEL. THIS MODE IS BASED ON THE INTRODUCTION OF TWO NEW QUANTITIES IN THE MICROSCOPIC LEVEL, AND ON THE HYPOTHESIS THAT THE CRACK FOR THE EARLYN STEPS OF ITS PROPAGATION IS MOVING IN THE FORM OFA TWIN SINGULARITY. THE RESULTS OF THE APPLICATION WITH EXPERIMENTAL EVIDENCE.IN THE SEQUEL THE SOURCES OF THE ABOVE MENTIONED PHENOMENA ARE INVESTIGATED ASRESULTS OF THE LOCAL ANISOTROPIES AROUND THE MOVING CRACK-TIP CAUSED BY THE MOVEMENT OF THE CRACK.

Grantor dc:publisher

Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ)

Year dc:date

1989

Authors dc:creator

• Κουρκούλης, Σταύρος
• Kourkoulis, Stavros

• (DYNAMIC) CRACK BRANCHING
• (DYNAMIC) CRACK CURVING
• (DYNAMIC) CRACK PATH INSTABILITY
• (DYNAMIC) CRACKKINKING
• (ΔΥΝΑΜΙΚΗ) ΔΙΧΑΛΩΣΗ ΡΩΓΜΩΝ
• (ΔΥΝΑΜΙΚΗ) ΛΟΞΩΣΗ ΡΩΓΜΩΝ
• CRACK ARREST
• CRACK PROPAGATION CRITERIA
• DYNAMIC MODULES OF ELASTICITY
• DYNAMIC STRESS FIELD
• DYNAMIC STRESS INTENSITY FACTOR
• ΑΚΙΝΗΤΟΠΟΙΗΣΗ ΡΩΓΜΩΝ
• ΑΣΤΑΘΕΙΑ ΤΗΣ ΔΙΕΥΘΥΝΣΕΩΣ ΤΩΝ ΡΩΓΜΩΝ
• ΔΥΝΑΜΙΚΟ ΜΕΤΡΟ ΕΛΑΣΤΙΚΟΤΗΤΑΣ
• ΔΥΝΑΜΙΚΟ ΤΑΣΙΚΟ ΠΕΔΙΟ
• ΔΥΝΑΜΙΚΟΣ ΣΥΝΤΕΛΕΣΤΗΣ ΕΝΤΑΣΕΩΣ ΤΩΝ ΤΑΣΕΩΝ
• ΚΡΙΤΗΡΙΑ ΔΙΑΔΟΣΕΩΣ ΡΩΓΜΩΝ
• Engineering and Technology
• Mechanical Engineering
• Επιστήμες Μηχανικού και Τεχνολογία
• Επιστήμη Μηχανολόγου Μηχανικού

Language dc:language

gre

Identifier

10.12681/eadd/1138

OAI identifier oai:identifier

oai:10442/1138