Vol.3, No 13, 2003 pp. 573-581
UDC 551.324.85:532.61.042:537.226.86:621.833
APPLICATION OF THE INTERFACE CRACK CONCEPT
TO PROBLEM OF A CRACK
BETWEEN A THIN LAYER AND A SUBSTRATE
Jelena M. Veljković, Ružica R. Nikolić
Faculty of Mechanical Engineering
Sestre Janjić 6, YU 34000 Kragujevac, Yugoslavia
In this paper the problem of a crack lying along the interface of a thin
film and a substrate is considered. For thin layers, the residual tensile
stresses that develop in the layer are of major importance. In the present
paper an interpretation of this problem by the concept of linear elastic
fracture mechanics is presented. The energy release rate and the stress
intensity factor are determined in terms of a dimensionless factor,?, that
is function of specimen geometry and elastic material properties. The problem
of thin layers under conditions of residual tensile stresses is of utmost
importance in applications related to composite materials manufacturing,
electronic devices design, protective coating, among others.
Key words: Interface crack consept, thin film, substrate,
residual tensile stresses, stress intensity factors
PRIMENA KONCEPTA INTERFEJSNE PRSLINE NA
PROBLEM PRSLINE IZMEDJU TANKOG SLOJA I OSNOVE
U radu se razmatra problem prsline na spoju tankog filma i osnove. Za tanke
slojeve najvažniji je problem slojeva izloženih zaostalim zateznim naponima.
U radu je prikazana interpretacija ovog problema primenom koncepta linearne
elastične mehanike loma za prslinu na intefejsu. Odredjene su veličine
brzine oslobadjanja energije i faktora intenziteta napona u zavisnosti
od samo jednog bezdimenzionog faktora ?, koji je funkcija geometrije uzorka
i elastičnih karakteristika materijala. Problem tankog sloja, u uslovima
zaostalih zateznih napona, predstavlja adekvatan model za rešavanje problema
u oblasti proizvodnje kompozitnih materijala, projektovanja elektronskih
uredjaja, problema zaštitnih prevlaka i drugih.
Ključne reči: koncept interfejsne prsline, tanak film, zaostali
naponi, faktori intenziteta napona.
