From the point of strength, an eggshell needs a strong resistance from the foreign enemies during the hatching period. On the other hand, when the hatching is accomplished, the eggshell must be fractured easily by load applied from within by the hatching embryo. This means the eggshell is stronger for external loads, but weaker for internal loads. In analogy, such functions are also desirable for an automobile windshield. In general, the front glass (windshield) needs strong resistance from high speed missile. On the other hand, it must be fractured easily by internal load because in case of a traffic accident the drivers head impacts heavily on the front glass. Therefore, the analysis of the structural and material composition of eggshell is very useful in development of new automobile front glass with anisotropy. In this study, the structural and material composition of an eggshell (from a hen's egg) is analyzed by microscopic observation, static and dynamic penetration tests and finite element method (FEM). From microscopic observation, the eggshell is found to have a laminated structure of many material compositions. The outer eggshell membrane acts as a strong adhesive agent between the inner eggshell membrane and the eggshell. A cone-type punch and striker makes an initial crack easily, but subsequently large penetration energies are required. The penetration energy required from outside of an eggshell is larger than from inside because it includes the energies required to break the membrane and peel it off the eggshell.
Mechanical evaluations of structural and material composition of eggshell
Mechanische Bewertung der Struktur und Zusammensetzung der Eierschale des Hühnereis als Vorbild für die Windschutzscheibe im Automobil
1998
6 Seiten, 15 Bilder, 2 Tabellen, 4 Quellen
Aufsatz (Zeitschrift)
Englisch
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