Institute of Physics of Materials AS CR, v. v. i. > Projects > The transferability of fracture toughness characteristics from point a view of integrity of components with defects

The transferability of fracture toughness characteristics from point a view of integrity of components with defects

InvestigatorIng. Vladislav Kozák, CSc.
Number of ProjectGA101/00/0170
AgencyGrantová agentura České republiky
Duration1999-12-31 - 2002-12-30

Anotace
The purpose of the project is to evaluate the brittle and ductile fracture of components with cracks and the stress concentrators with respect to transition behavior on the micromechanistics deterministic and stochastic models of failure. The experimental data from laboratory and finite elements method are the base tools. The principle of this project is measurement of a fracture toughness on the „small specimens“. The project concludes with an application of the mentioned models to predict the material behavior on the standard geometry and components and structures. The solution of this project concurs of the project results of the grant of the Grant Agency of the Czech Republic „Local approach for the assessment for brittle fracture of components” and running project NATO SfP „Fracture resistance of steels for containers of spent nuclear fuel No. 972655“. The goal is to examine and develop „fracture toughness scaling models“ based on the micromechanistics treatment to predict constraint and size effects on cleavage fracture toughness. General approaches adopt e. g. the Weibull stress w as a suitable near crack-tip parameter to evaluate the statistics of microcracks, in another models e.g. the critical size of plastic zone is used, etc. The manganese cast steel intended for the container of the spent nuclear fuel Škoda will be used as a investigated material. For verification of various models, the rotor steel which can be prepared in some modification for various micromechanisms of fracture, will be also used.


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