Publication detail
INFLUENCE OF THE INTERFACE ON THE APPARENT FRACTURE TOUGHNESS AND CRACK PROPAGATION DIRECTION IN LAYERED CERAMIC COMPOSITES
NÁHLÍK, L. MÁŠA, B. HUTAŘ, P.
Czech title
VLIV ROZHRANÍ NA ZDÁNLIVOU LOMOVOU HOUŽEVNATOST A ŠÍŘENÍ TRHLINY VE VRSTEVNATÝCH KERAMICKÝCH KOMPOZITECH
English title
INFLUENCE OF THE INTERFACE ON THE APPARENT FRACTURE TOUGHNESS AND CRACK PROPAGATION DIRECTION IN LAYERED CERAMIC COMPOSITES
Type
abstract
Language
en
Original abstract
The main aim of this contribution is the fracture behavior of layered ceramic composite with residual stresses. The influence of laminate composition on crack propagation (influence of material interfaces on crack shielding, effect of residual stresses, etc.) was investigated. The crack behavior was described by procedures based on linear elastic fracture mechanics (LEFM) and generalized LEFM. Computations were performed in 2D geometry under plain strain assumptions. For determination of the real crack front shape during the crack propagation the three dimensional FEM models were developed. Both (2D/3D) approaches were compared and differences were closely discussed. The influence of laminate composition with residual stresses on critical values for crack propagation through laminate interfaces was also determined. The results obtained can be used for a design of new layered composites with improved resistance against propagation of cracks.
Czech abstract
Hlavním zaměřím tohoto příspěvku je lomové chování vrstevnatých keramických kompozitů s reziduálním napětím. Je vyšetřován vliv kompozice laminátu na šíření trhliny (vliv materiálového rozhraní na zastavení trhliny, efekt zbytkových napětí, atd.). Lomové chování bylo popsáno na základě lineární elastické lomové mechaniky (LELM) a zobecněné LELM. Výpočty prováděné ve 2D byly za podmínky rovinné deformace. Pro určení skutečného tvaru čela trhliny v průběhu jejího šíření bylo potřeba vytvořit třídimenzionální modely. Oba přístupy (2D/3D) byly porovnány a případné rozdíly byly blíže rozebrány. Pro trhlinu šířící se skrz rozhraní byly určeny kritické lomové parametry a byl zkoumán vliv kompozice laminátu s reziduálními napětími na hodnoty těchto parametrů. Získané výsledky mohou být použity k navržení laminátů s lepší odolností proti šíření trhlin.
English abstract
The main aim of this contribution is the fracture behavior of layered ceramic composite with residual stresses. The influence of laminate composition on crack propagation (influence of material interfaces on crack shielding, effect of residual stresses, etc.) was investigated. The crack behavior was described by procedures based on linear elastic fracture mechanics (LEFM) and generalized LEFM. Computations were performed in 2D geometry under plain strain assumptions. For determination of the real crack front shape during the crack propagation the three dimensional FEM models were developed. Both (2D/3D) approaches were compared and differences were closely discussed. The influence of laminate composition with residual stresses on critical values for crack propagation through laminate interfaces was also determined. The results obtained can be used for a design of new layered composites with improved resistance against propagation of cracks.
Keywords in Czech
keramický laminát, lomová mechanika, MKP, rozhraní, šíření trhliny
Keywords in English
ceramic laminate, fracture mechanics, FEM, interphase, crack propagation
Released
28.07.2013
ISBN
978-0-9696797-1-4
Edition number
1
Pages from–to
7837–7838
Pages count
9379