![Sample our Environment & Agriculture journals, sign in here to start your access, latest two full volumes FREE to you for 14 days]({"type":"image" , "src" : "/sda/5934/TOC-Subject-Sample-2021-Environment-Agriculture.jpg"})
ABSTRACT
Three measurement methods (falling impact, resonance impulse method and puncture test) are applied to determine some mechanical properties of Golden Delicious apple. Hertz' theory modified by Kozma and Cunningham for impact between two elastic bodies are applied in this work. This allows Young's modulus E, Poisson's ratio ν and Lame's coefficients µ and λ calculation from elasticity coefficients measured by puncture test and acoustic impulse method. Young's modulus and Lame's coefficients decreased with storage time and with degree of fruit ripening. Variation of Poisson's ratio during ripening appears to occurred into three steps: a moderate increase at the beginning of storage, a virtually constant value close to 0.170 up to the fourth storage month and an increase close to 25% up to 186 days cold storage. At the beginning of storage, increasing of Poisson's ratio linked to the decrease of percent contribution of the flesh to the overall firmness. Relationship between Young's modulus and Lame's coefficient µ is linear. Lame's coefficient µ and percent contribution of the flesh to the overall firmness decreased in the same extent (about 43%) during a 186 days cold storage.
