Thermal and mechanical properties of eggshell under different treatments
Modulus of elasticity, shear modulus, Poisson’s ratio, and coefficient of linear thermal expansion of eggshell were measured for eggshells as affected by egg weight, egg specific gravity, hens’ age, hot washing, and hot washing followed by cooling. The mean measured values of linear thermal expansion coefficient in latitudinal and meridional directions were 4.4 ¥ 10–6°C–1 and 4.2 ¥ 10–6°C–1, respectively. For 4 out of 24 treatments, differences in the coefficient of linear thermal expansion were statistically significant (p < 0.05) for the two different hens’ age (34 vs. 51 weeks).