Papers by Author: Tibor Köves

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Authors: Peter Zimovčák, Tibor Köves, Ján Dusza, Ladislav Pešek, Francis Chalvet, Goffredo de Portu
Abstract: Micro- and macro-hardness of the individual layers of an Al2O3 / Al2O3 + ZrO2 layered composite have been investigated. The indentation load size effect has been studied in a range of indentation load of 25 mN – 100 N using depth sensing indentation technique and conventional Vickers hardness testers. Fracture toughness values of the layers have been measured using indentation fracture method. The effect of residual stresses on the KIC value has been analyzed.
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Authors: Peter Zimovčák, Tibor Köves, Ján Dusza, Francis Chalvet, Goffredo de Portu
Abstract: The aim of the paper is to present an analytical model of thermal stresses in a laminar system, and consequently to verify the model validity by comparing calculated thermal stresses with measured ones by indentation method. Analytical models of thermal stresses acting in anisotropic and isotropic laminar plane systems are presented, and consequently applied to the thermal-stress-strengthened Al2O3-ZrO2 laminar ceramics.
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