Crack bifurcation features in laminar specimens with fixed total thickness

Lugovy, Mykola; Orlovskaya, Nina; Slyunyayev, V.; Gogotsi, G. A.; Kübler, Jakob; Sánchez-Herencia, Antonio Javier

doi:10.1016/s0266-3538(02)00040-4

Cited by 28 publications

(27 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Following these ideas, thin compressive layers are desirable, as they will create an additional reinforcement as well as diminish the associated residual tensile stress. Moreover, the thickness of the layers are referred to other observations related to the residual stresses, such as edge crack and crack bifurcation, for which a critical thickness ''t c '' has to be surpassed [13,16,21].…”

Section: Introductionmentioning

confidence: 99%

Processing optimisation and fracture behaviour of layered ceramic composites with highly compressive layers

Bermejo

Baudı́n

Moreno

et al. 2007

Composites Science and Technology

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Processing optimisation and fracture behaviour of layered ceramic composites with highly compressive layers

Bermejo

Baudı́n

Moreno

et al. 2007

Composites Science and Technology

View full text Add to dashboard Cite

“…This phase transformation causes a volume expansion of $4%, which results in biaxial compressive stresses produced in the central A-A(MZ) Xvol.% layer, while tensile stresses are generated in the external Al 2 O 3 layer. The level of these stresses depends on the thickness, elastic constant and compressive strain of each layer [7,10,32]. Using the data reported in the literature and the classical residual stress equation [9,10], the residual tensile stresses inside the alumina outer layers were evaluated as 850, 550, 300 and 30 MPa for samples with 30, 20, 10 and 5 vol.% MZ, respectively.…”

Section: Microstructural Characterizationmentioning

confidence: 99%

Microstructural characterization of alumina–zirconia layered ceramics using positron annihilation spectroscopy

et al. 2010

View full text Add to dashboard Cite

A c t a M a t e r i a l i a (A b s t r a c t : P o s i t r o n a n n i h i l a t i o n s p e c t r o s c o p y ( PA S ) , i n d e n t a t i o n , n a n o i n d e n t a t i o n e x p e r im e n t s a n d s c a n n i n am i n a t e s s am p l e s t o a s s e s s t h e e ff e c t o f r e s i d u a l s t r e s s e s o n t h e i r m e c h a n i c a l a n d m i c r o s t r u c t u r a l p r o p e r t i e s . L a y e r e d s am p l e s w e r e im p l em e n t e d b y s l i pc a s t i n g , c o n s t i t u t e d b y tw o t h i n A l 2 O 3 e x t e r n a l l a y e r s a n d a n i n t e rm e d i a t e t h i c k o n e , c o n s i s t i n g o f a m i x t u r e o f A l 2 O 3 a n d m o n o c l i n i c Z rO 2 i n t h e r a n g e 03 0 v o l .% . I n t h e s e s y s t em s r e s i d u a l t e n s i l e s t r e s s e s fi e l d s w e r e g e n e r a t e d i n s i d e t h e e x t e r n a l l a y e r s d u r i n g c o o l i n g f r om t h e s i n t e r i n g t em p e r a t u r e , b y t h e e x p a n s i o n o f t h e a d j a c e n t Z rO 2 c o n t a i n i n g l a y e r . S EM o b s e r v a t i o n s s h ow e d t h e m i c r o s t r u c t u r a l e ff e c t s d u e t o t h e l e v e l o f t e n s i o n r e l a t e d t o t h e z i r c o n i a c o n t e n t .A c o r r e l a t i o n b e tw e e n t h e PA S p a r am e t e r s a n d t h e m i c r o s t r u c t u r a l c h a n g e s c a u s e d b y t h e p r e s e n c e o f r e s i d u a l s t r e s s e s w a s f o u n d . N a n o i n d e n t a t i o n m e a s u r em e n t s w e r e u s e d t o t r a c e t h e s i g n a n d m a g n i t u d e o f t h e r e s i d u a l s t r e s s g r a d i e n t a c r o s s t h e i n t e r f a c e b e tw e e n t h e l a y e r s .K e y w o r d s : R e s i d u a l s t r e s s e s ; C e r am i c s ; M u l t i l a y e r s ; P o s i t r o n a n n i h i l a t i o n ; N a n o i n d e n t a t i o n . I n t r o d u c t i o n R e s i d u a l s t r e s s e s p l a y a n im p o r t a n t r o l e i n m a n y t e c h n ol o g i c a l a p p l i c a t i o n s . I n l a y e r e d c e r am i c s , t h e p r e s e n c e o f c om p r e s s i v e r e s i d u a l s t r e s s e s c a n d e l a y t h e p r o p a g a t i o n o f c r a c k s a n d i n c r e a s e a l l t h e a s s o c i a t e d p r o p e r t i e s s u c h a s h a r d n e s s , f r a c t u r e t o u g h n e s s a n d r e l i a b i l i t y [ ]. T h e e ff e c t o f c om p r e s s i v e s t r e s s e s a ff e c t s n o t o n l y r u n n i n g c r a c k s , b u t a l s o t h e f r a c t u r e s t r e n g t h b y t h e m e c h a n i sm o f s u r f a c e s t r e n g t h e n i n g [ 2 , 3 ] . H ow e v e r , t h e p r e s e n c e o f t e n s i l e r e s i d u a l s t r e s s e s u s u a l l y p r om o t e s c r a c k a d v a n c e t h r o u g h t h e m a t e -r i a l a n d , c o n s e q u e n t l y , r e d u c e s t h e m e c h a n i c a l r e s p o n s e . F u r t h e rm o r e , t e n s i l e s t r e s s e s s uffi c i e n t l y s t r o n g c a n b r e a k t h e m a t e r i a l [ 4 ] . I f t h e r e i s a m e t a l l i...

show abstract

“…Such criteria were proposed by Ho et al [45] and extended by Lugovy et al [18] for brittle multi-layered systems under significant residual stresses. They were based on the material stiffness, Poisson's ratios and critical stress intensity factors, that is, on concepts that have no relevance to the LSY problems under consideration.…”

Section: Deflected Cracksmentioning

confidence: 99%

A numerical study of crack shielding and deflection under extensive plasticity

Burke-Veliz

Reed

Syngellakis

2009

Engineering Fracture Mechanics

View full text Add to dashboard Cite

Experimentally observed crack deflection events in multi-layered material systems, occurring even under pure mode-I loading, are here simulated and explained through elasto-plastic finite element modelling. The crack tip opening displacement is adopted as the crack driving force and estimated along crack paths whose deflection is predicted using the maximum tangential strain criterion. Shielding conditions that promote deflection and bifurcation are evaluated. It is shown that, under conditions of extended plasticity, CTOD evolution as a crack approaches an interface can reveal crack shielding and amplification, and that crack deflection and growth can be assessed from the variation of tangential strains around the crack tip.

show abstract

Crack bifurcation features in laminar specimens with fixed total thickness

Cited by 28 publications

References 15 publications

Processing optimisation and fracture behaviour of layered ceramic composites with highly compressive layers

Processing optimisation and fracture behaviour of layered ceramic composites with highly compressive layers

Microstructural characterization of alumina–zirconia layered ceramics using positron annihilation spectroscopy

A numerical study of crack shielding and deflection under extensive plasticity

Contact Info

Product

Resources

About