NAVRÁTIL, Vladislav and Jiřina NOVOTNÁ. SOME PROBLEMS OF MICROHARDNESS OF METALS. Journal of Applied Mathematics. Bratislava: Slovak University of Technology, 2009, Vol. 2, No 3, p. 241 - 244. ISSN 1337-6365.
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Basic information
Original name SOME PROBLEMS OF MICROHARDNESS OF METALS
Name in Czech Některé problémy mikrotvrdosti kovů
Authors NAVRÁTIL, Vladislav (203 Czech Republic, guarantor, belonging to the institution) and Jiřina NOVOTNÁ (203 Czech Republic, belonging to the institution).
Edition Journal of Applied Mathematics, Bratislava, Slovak University of Technology, 2009, 1337-6365.
Other information
Original language English
Type of outcome Article in a journal
Field of Study 10302 Condensed matter physics
Country of publisher Slovakia
Confidentiality degree is not subject to a state or trade secret
RIV identification code RIV/00216224:14410/09:00036925
Organization unit Faculty of Education
UT WoS 000272790800031
Keywords (in Czech) Mikrotvrdost; indentace; matematický popis; dislokace
Keywords in English Microhardness; Indentation; Mathematics; Dislocations
Tags International impact, Reviewed
Changed by Changed by: prof. RNDr. Vladislav Navrátil, CSc., učo 129. Changed: 15/12/2010 11:47.
Abstract
The purpose of our contribution was to study the load dependence of the microhardness. This well known phenomena is called the Indentation Size Effect (ISE) and was investigated for two sets of specimen: pure copper and zinc. Variation of the microhardness with depth of indent (or applied load) was compared with various existing models. For the materials investigated the ISE is not artefact and can be explained by the hypothesis of presence of geometrically necessary dislocations, i.e. dislocations produced to accomodate the gradient in strain surrounding the indent.
Abstract (in Czech)
Cílem našeho příspěvku je studium závislosti mikrotvrdosti na hloubce vtisku (nebo na aplikovaném zatížení). Tato závislost je zpravidla klesající a je známa jako Indentation Size Effect (ISE). Studovali jsme ji pro čistou měď a zinek a výsledky porovnali se známými modely. Naměřené výsledky ukazují, že pro námi vyšetřované materiály (Cu a Zn) není ISE artefaktem, ale je vlastností materiálu. Kvalitativně lze tento jev objasnit pomocí předpokladu o existenci tzv. geometricky nutných dislokací, tj. dislokací, vznikajících v okolí vtisku..
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