Abstract
The paper deals with the study of the goose eggs behaviour under compressive loading between two plates using testing device TIRATEST. The influences of the loading orientation as well as the effect of compressive velocity are studied. 226 eggs from Landes geese were chosen for the experiment. Eggs have been loaded between their poles and in the equator plane. Five different compressive velocities (0.0167, 0.167, 0.334, 1.67 and 5 mm.s-1) were used. The increase in rupture force with loading rate was observed for loading in all direction (along main axes). Dependence of the rupture force on loading rate was quantifies and described. The highest rupture force was obtained when the eggs were loaded along their axes of symmetry (X-axis). Compression in the equator plane (along the Z-axis) required the least compressive force to break the eggshells. The eggshell strength was described by the rupture force, specific rupture deformation and by the absorbed energy. The rupture force is highly dependent on compression speeds. The dependence of the rupture force on the compression velocity can be described by a power function. The same is valid for the rate dependence of the energy absorbed by the egg up to the fracture. The rate sensitivity of the Goose's eggshells strength is significantly higher than that reported for the hen's eggs
Highlights
Eggs can be regarded as naturally packaged food
For all used orientation of the egg compression the rupture force exhibits its maximum in such loading orientation, when the moving plate is in contact with the sharp end of the egg (Xs axis)
The eggshell strength was described by the rupture force, specific rupture deformation and by the absorbed energy
Summary
Eggs can be regarded as naturally packaged food. When examining the quality of the packaging, one primarily considers the strength of the eggshell. Shells must be strong enough to prevent failure during packing and/or transportation. Resulting eggshell strength is influenced by material and structural strength (Bain, 1992). The material strength depends on the association of the mineral and the organic components of the shell. Structural strength, on the other hand, is related to the interaction among the building units and depends on several variables, namely egg dimensions, egg shape, eggshell thickness, and distribution of the shell components. Most techniques that aim at quantifying eggshell strength measure eggs as a whole and thereby make no distinction between these two properties
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