Acta Univ. Agric. Silvic. Mendelianae Brun. 2010, 58(1), 161-166 | DOI: 10.11118/actaun201058010161

Nová metoda stanovení mikromechanických vlastností vaječné skořápky

Libor Severa, Jaroslav Buchar, Jiří Votava
Ústav techniky a automobilové dopravy, Mendelova zemědělská a lesnická univerzita v Brně, Zemědělská 1, 613 00 Brno, Česká republika

Předkládaná práce popisuje metodu nanoindentace a hodnotí její možnosti při stanovení lokálních mikromechanických vlastností skořápek slepičích vajec. Práce též srovnává získané experimentální výsledky s výsledky tradičních testů.
Testována byla vejce slepic plemene Hisex Brown. Vzorky skořápek odebrané ze střední části vejce (rovníku) byly zality do dentakrylových tablet. Tablety byly následně vysušeny a vyleštěny tak, aby drsnost povrchu nepřesahovala hodnotu 10-20 nm.
Experimenty byly provedeny na nanoindentačním zařízení CSM. Během zatěžování, zádrže i odtěžování byla sledována závislost hloubky indentace na síle. Pomocí analytických řešení byly z těchto závislostí vypočteny elastické konstanty. Vzorky skořápek byly zatěžovány v radiálním a tangenciálním směru.
Hodnoty E získané při zatěžování v radiálním a tangenciálním směru se nelišily statisticky významným způsobem (41 ± 3.9 GPa a 43 ± 4.1 GPa). Tento výsledek naznačuje isotropní charakter struktury vaječné skořápky. Významně se nelišily ani hodnoty naměřené po obvodu rovníku. Hodnoty E se v zásadě shodovaly s hodnotami uváděnými Nedomovou et al. (2009), kde byl E hodnocen jiným postupem na obdobných vzorcích.
Bylo prokázáno, že nanoindentace představuje relevantní a přesný nástroj pro stanovení materiálových charakteristik vaječných skořápek na mikroskopické úrovni. Získaná data mohou být dále využita např. pro tvorbu modelů nebo numerické simulace chování vajec.

vaječná skořápka, modul pružnosti, mechanické vlastnosti

New approach of eggshell mechanical properties determination

The paper describes a new approach for determination of mechanical properties of hen's eggshell. The suitability and applicability of a Berkovich indentation is discussed. The eggshells were tested in the area surrounding equator line. The deformation modes active during indentation have been examinined from the shape of load-displacement curves. According to measured dependencies, the eggshel shown an viscous-elastic deformation.The values of Young's modulus E obtained from radial and tangential directions did not vary significantly. This fact shows on isotropic nature of eggshell structure. It was found that values of E do not significantly change neither around the circumference of the equator. The values obtained within this research correspond to values reported in literature and obtained on macroscopic samples. Nanoindentation was found to be a precise and powerful tool, suitable for determining local variations of mechanical properties of eggshells.

Keywords: egg shell, modulus of elasticity, mechanical properties
Grants and funding:

The research has been supported by the Grant Agency of the Czech Academy of Sciences under Contract No. IAA201990701.

Received: November 16, 2009; Published: October 5, 2014  Show citation

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Severa, L., Buchar, J., & Votava, J. (2010). New approach of eggshell mechanical properties determination. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 58(1), 161-166. doi: 10.11118/actaun201058010161
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