ΕΛΕΓΧΟΜΕΝΗ ΔΙΑΔΟΣΗ ΡΩΓΜΩΝ ΛΟΓΩ ΚΟΠΩΣΗΣ ΣΕ ΣΥΝΘΗΚΕΣ ΣΥΝΤΟΝΙΣΜΟΥ

FATIGUE CRACK PROPAGATION IN VARIOUS RESONATING MEMBERS IS STUDIED. THE CRACK PROPAGATION RATE IS RELATED TO THE STRESS INTENSITY FACTOR OR THE STRAIN ENERGY DENSITY FACTOR DEPENDING ON THE KIND OF THE APPLIED LOADING. FOR THIS PURPOSE, THE WELL KNOWN EQUATIONS OF PARIS AND SIH ARE USED. THE DEPTH OF THE CRACK DETERMINES THE LOCAL STIFFNESS INTRODUCED BY THE CRACK, WHICH IN TURN INFLUENCES THE DYNAMIC RESPONSE OF THE MEMBER UNDER AN EXTERNAL EXCITATION OF CONSTANT AMPLITUDE AND FREQUENCY. AS THE CRACK PROPAGATES, INTRODUCES ADDITIONAL FLEXIBILITY TO THE SYSTEM . AS THE CRACK PROPAGATES, INTRODUCES ADDITIONAL FLEXIBILITY TO THE SYSTEM, WHICH GUIDES TO SHIFT AWAY FROM RESONANCE AND RESULTS IN SMALLER LOADING OF THE CRACKED SECTION. THIS CAUSES THE CRACK PROPAGATION RATE TO BE DRASTICALLY REDUCED AND, UNDER CERTAIN CIRCUMSTANCES, TO BECOME SMALLER THAN A THRESHOLD LEVEL, CHARACTERISTIC OF THE MATERIAL CONSIDERED. THIS PHENOMENON CAN BE INTERPRETED AS DYNAMIC CRACK ARREST. FOR STRUCTURAL MEMBERS AND IF THE MATERIAL DAMPING DOMINATES, THE LOSS COEFFICIENT IS PROVED TO BE THE MAIN FACTOR DETERMINING DECISIVELY THE CRACK PROPAGATION RATE AT THE INITIAL STAGES OF THE CRACK GROWTH.

Grantor dc:publisher

University of Patras

Year dc:date

1987

Authors dc:creator

• Δέντσορας, Αργύρης
• Dentsoras, Argyris

• Διάδοση ρωγμών
• Κόπωση
• Ρωγμή κόπωσης
• ΣΥΝΤΕΛΕΣΤΗΣ ΑΠΟΣΒΕΣΗΣ ΥΛΙΚΟΥ
• Συντονισμός
• CRACK BECAUSE OF FATIGUE
• Crack propagation
• Fatigue
• LOSS COEFFICIENT
• Resonance
• Επιστήμες Μηχανικού και Τεχνολογία
• Επιστήμη Μηχανολόγου Μηχανικού
• Engineering and Technology
• Mechanical Engineering

Language dc:language

gre

Identifier

10.12681/eadd/0546

OAI identifier oai:identifier

oai:10442/0546