RT Journal Article
SR Electronic
A1 Severa, Libor
A1 Buchar, Jaroslav
A1 Votava, Jiří
T1 New approach of eggshell mechanical properties determination
JF Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis
YR 2014
VO 58
IS 1
SP 161
OP 166
DO 10.11118/actaun201058010161
UL https://acta.mendelu.cz/artkey/acu-201001-0019.php
AB 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.