Goose`s eggshell strength at compressive loading

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

Effect of the loading rate on compressive properties of goose eggs

“…This research extends our preliminary results obtained in [12]. In order to interpret the obtained results, some basic physical properties such as dimensional properties, description of the eggshell contour, sphericity, unit mass, egg surface, volume and eggshell thickness have been also evaluated.…”

“…Because this is not typical for goose eggs this parameter has not been used in the given paper [12].…”

Some Physical, Morphological, and Mechanical Characteristics of Turkey (Meleagris gallopavo) Eggs

“…Comparatively, goose eggs present higher breaking strength (74.17-105.32 N); however, they are larger than turkey eggs, with average length of 78.26 mm and width of 53.62 mm (Zhang et al, 2017). Nedomova et al (2014) also reported higher breaking strength in goose eggs (63.80-101.92 N) loaded at the same compression speed of 0.33 mm s -1 as in the present study. On the other hand, much higher breaking strengths are obtained in large eggs, such as ostrich eggs 531.52-904.54 N (Nedomova et al, 2013), whereas small eggs, such as those of Japanese quails (weighing 10.58-14.25 g) have much lower breaking strength, of 6.2-11.4 N (Polat et al, 2007).…”

“…The average absorbed energy values determined in Zagorje turkey eggs (7.36-9.75 N mm) are higher than the values of 3.29-3.53 N mm observed in Lohmann chicken eggs (Altuntas & Sekeroglu, 2008), of 2.80-5.10 N mm in Hisex Brown chicken eggs (Nedomova et al, 2009) and of 3.41-7.88 N mm in Japanese quail eggs (Polat et al, 2007), but lower than the values of 8. .99 N mm reported for goose eggs (Nedomova et al, 2014) and much lower than those observed in ostrich eggs, of 90. 59-217.19 N (Nedomova et al, 2013).…”

Tensile Strength of the Eggshell Membranes

“…The results on the fracture strength of the whole eggshell show that this parameter is more or less dependent on the loading rate (Carter, 1979;Trnka et al, 2012;Nedomová et al, 2014). The same dependence may occur also for the eggshell membranes.…”