Institute of Physics of Materials AS CR, v. v. i. > Projects > Mechanical and fracture properties of multilayered ceramic/ceramic and ceramic/metal materials with graded layers

Mechanical and fracture properties of multilayered ceramic/ceramic and ceramic/metal materials with graded layers

Co-investigatorprof. Ing. Ivo Dlouhý, CSc.
Number of ProjectGA101/09/1821
AgencyGrantová agentura České republiky
Duration2008-12-31 - 2012-12-30

Anotace
Lamellar structures provide significant increases in toughness over other microstructures. By layering different structural ceramic materials, the apparent fracture toughness can be increased through either enhancement of toughening mechanisms or residual stress effects. The state of knowledge regarding the mechanical and fracture properties of multilayers has increased greatly within the last decade, but there remain several critical areas in need of further research. Available residual stressesand fracture criteria refer to conditions far from surfaces or edges. This is an important distinction, since pronounced edge effects are known to exist in displacement, stress, temperature, magnetic, and electrical fields. One of the ways to reconcile the edge and/or interface effects is the introduction of gradual compositional changes into individual layers which removes large-scale interface-induced stress singularities and can even result in stress-free material joints.

2013

Profant T., Klusák J., Ševeček O., Kotoul M.: On the direction of a crack initiated from an orthotropic bi-material notch composed of materials with non-uniform fracture mechanics properties. Key Eng. Mater. 525-526 (2013) 545-548

Řehořek L., Chlup Z., Meng D., Yunos D., Boccaccini A., Dlouhý I.: Response of 45S5 Bioglass (R) foams to tensile loading. Ceram. Int. 39 (2013) 8015-8020

Profant T., Klusák J., Ševeček O., Hrstka M., Kotoul M.: An energetic criterion for a micro-crack of finite length initiated in orthotropic bi-material notches. Eng. Fract. Mech. 110 (2013) 396-409


2012

Ahmedw A., Chlup Z., Dlouhý I., Rawlings R., Boccaccini A.: Mechanical Properties of Low-Density SiC-Coated Carbon-Bonded Carbon Fiber Composites. Int. J. Appl. Ceram. Technol. 9 (2012) 401-412

Boccaccini D., Maioli M., Cannio M., Dlouhý I., Romagnoli M., Leonelli C., Boccaccini A.: A lifetime prediction method based on Cumulative Flaw Length Theory. J. Eur. Ceram. Soc. 32 (2012) 1175-1186

Ševčík M., Hutař P., Knésl Z., Náhlík L., Zouhar M.: Estimation of the critical configuration of a crack arrested at the interface between two materials. Comp. Mater. Sci. 64 (2012) 225-228

Marcián P., Majer Z., Florian Z., Dlouhý I.: Stress Strain Analysis of High Porous Ceramics. Adv. Mater. Res. 482-484 (2012) 1330-1333


2011

Jurči P., Dlouhý I.: Fracture behaviour of P/M Cr-V ledeburitic steel with different surface toughness. Materials Engineering - Materialove inzinierstvo 18 (2011) 36-43

Náhlík L., Šestáková L., Hutař P., Knésl Z.: Generalized linear elastic fracture mechanics: an application to a crack touching the bimaterial interface. Key Eng. Mater. 452-453 (2011) 445-448

Jurči P., Dlouhý I.: Coating of Cr-V ledeburitic steel with CrN containing a small addition of Ag. Appl. Surf. Sci. 257 (2011) 10581-10589

Cho J., Inam F., Reece M., Chlup Z., Dlouhý I., Shaffer M., Boccaccini A.: Carbon nanotubes: do they toughen brittle matrices?. J. Mater. Sci. 46 (2011) 4770-4779