Residual stresses, strength and toughness of laminates with different layer thickness ratios

Bermejo, Raúl; Torres, Yadir; Sánchez-Herencia, Antonio Javier; Baudı́n, Carmen; Anglada, M.; Llanes, L.

doi:10.1016/j.actamat.2006.06.008

Cited by 131 publications

(98 citation statements)

References 34 publications

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“…3). Such bifurcation 9 process implies energy consumption associated with the deviation of the crack from mode I of fracture, which also requires a higher stress level for further crack propagation, as it was demonstrated in a previous work under longitudinal flexure [22] .…”

Section: Strength On Specimens Containing a Single Crackmentioning

confidence: 88%

“…between the layers, as well as to phase transformations and/or chemical reactions within them [8,15,20]. In particular, ceramic composites with a layered structure such as alumina/zirconia have been reported to exhibit relatively large apparent fracture toughness, energy absorption capability and, consequently, non-catastrophic failure behaviour [8,14,15,21,22].…”

Section: Introductionmentioning

confidence: 99%

“…The purpose of this work is to investigate the loading configuration effects on the strength reliability of an optimally designed alumina/zirconia multilayered system [22] .…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Loading configuration effects on the strength reliability of alumina–zirconia multilayered ceramics

Bermejo¹,

Torres²,

Llanes³

2008

Composites Science and Technology

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Section: Strength On Specimens Containing a Single Crackmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Loading configuration effects on the strength reliability of alumina–zirconia multilayered ceramics

Bermejo¹,

Torres²,

Llanes³

2008

Composites Science and Technology

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“…They have been proposed as an alternative for the design of structural ceramics with improved fracture toughness, strength and mechanical reliability [13][14][15][16][17][18][19][20][21][22][23][24][25]. Good results have also been obtained in metal-ceramic [26] and metal-intermetallic laminates [27,28].…”

Section: Introductionmentioning

confidence: 70%

Processing and characterisation of cermet/hardmetal laminates with strong interfaces

et al. 2014

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Cemented carbides and cermets are potential materials for high speed machining tools.However, cemented carbides are not chemically stable at high temperature and cermets present poor fracture toughness. Novel cermet/hardmetal multilayer systems show a huge potential for this intended application. It would be possible to achieve the right balance of the required thermomechanical properties using cermet as temperature protective outer layers and hardmetal as reinforcement layers. In this work, preliminary results on the microstructural and mechanical characterisation of a multilayer TiC x N 1-xCo/WC-Co composite densified by hot pressing are presented, with special attention to the properties of the interface. Microstructural observations revealed the existence of strong bonding interfaces between cermet and hardmetal layers due to chemical interaction during the sintering process. As a consequence, owing to the different coefficient of thermal expansion between cermet and hardmetal, a tensile and compressive biaxial residual stress of σ res,Cermet ≈ +260±50 MPa and σ res,WC-Co ≈ -350±70 MPa was estimated in the corresponding layers. Microindentation cracks introduced in the cermet layers (the less toughness material) and propagated 2 transversely to the layers were arrested at the interface, showing the combined effect of toughness and compressive stresses on crack shielding.

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“…In an attempt to reduce the level of uncertainty in mechanical strength and to overcome the lack of toughness of structural and functional ceramics, newer approaches have been developed in which knowledge about the energy release mechanisms has resulted in the creation of "flaw tolerant" materials (i.e. reducing strength variability), with improved fracture toughness [9,10,[12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Modelling of edge crack formation and propagation in ceramic laminates using the stress–energy coupled criterion

Ševeček

Kotoul

Leguillon

et al. 2016

Engineering Fracture Mechanics

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. Modelling of edge crack formation and propagation in ceramic laminates using the stress-energy coupled criterion. Engineering Fracture Mechanics, Elsevier, 2016, 167, pp.45-55. <10.1016/j.engfracmech.2016 AbstractThe high compressive stresses in ceramic laminates utilized to enhance their fracture resistance may lead to the formation of edge cracks at the surface of the compressive layers. In this work, a 2D parametric numerical model is developed to assess the effect of residual stress and thickness of the compressive layers on the edge crack formation, by using a coupled stress-energy criterion. The results predict the existence of a lower bound, below which no edge crack occurs (i.e. obtaining crack-free laminates), and an upper bound, beyond which onset of the edge crack would lead to the complete delamination of the compressive layer. Keywords:Edge crack, residual stresses, ceramic laminate, FE analysis, coupled criterion.

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Residual stresses, strength and toughness of laminates with different layer thickness ratios

Cited by 131 publications

References 34 publications

Loading configuration effects on the strength reliability of alumina–zirconia multilayered ceramics

Loading configuration effects on the strength reliability of alumina–zirconia multilayered ceramics

Processing and characterisation of cermet/hardmetal laminates with strong interfaces

Modelling of edge crack formation and propagation in ceramic laminates using the stress–energy coupled criterion

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