YOUNG'S MODULUS, POISSON'S RATIO, AND LAME'S COEFFICIENTS OF GOLDEN DELICIOUS APPLE

Figures & data

Figure 1. Evolution of sonic elasticity coefficient (Es*) and penetrometric elasticity coefficient (Et*) during cold storage (2°C, 96% rh, 186 days) of Golden Delicious apples. Harvest 09/05/1995. Mean and standard error.

Figure 2. Figure 2. Relationship between maximum theoretical deformation computed from Hertz' equation, and maximum theoretical deformation (d_max) deduced from impact data. Golden Delicious apples (1357 fruits). 2a: d_max(Es*) – sonic elasticity coefficient 2b: d_max(Et*) – penetrometric elasticity coefficient.

Table 1. Mean Value of Young's Modulus (E), Poisson's Ratio (ν), Lame's Coefficients (λ and µ), and Percent Contribution of the Flesh to Overall Firmness (y) After Various Cold Storage Duration (2°C, 96% hr) (Golden Delicious Apples)

Time (days)	E (MPa)	ν	λ (MPa)	μ (MPa)	y (%)
4	3.33	0.167	0.839	1.43	66.56
17	3.09	0.184	0.847	1.31	62.25
47	2.79	0.175	0.824	1.19	53.04
61	2.61	0.181	0.771	1.11	44.64
78	2.50	0.162	0.623	1.08	43.68
91	2.49	0.188	0.756	1.05	45.23
109	2.33	0.176	0.635	0.993	38.90
112	2.28	0.185	0.706	0.966	41.83
120	2.33	0.150	0.492	1.01	38.34
139	2.25	0.160	0.533	0.970	37.47
152	2.10	0.191	0.619	0.882	36.88
172	2.09	0.198	0.683	0.874	38.53
182	2.01	0.229	0.779	0.819	38.08
186	2.00	0.221	0.763	0.823	37.93

Table 2. Reported Values of Poisson's Ratio ν for Some Apple Varieties41-42

Variety	ν
Golden delicious	0.169–0.244
Red delicious	0.155–0.207
Rome beauty	0.020–0.236
Turley	0.081–0.134
York	0.040–0.105

Figure 3. Evolution of Young's modulus (E), Poisson's ratio (ν) and Lame's coefficients (λ and μ) during a 186 days cold storage (2°C, 96% hr). Golden Delicious apples: mean value.

Figure 4. Evolution of Young's modulus (E), Lame's coefficients (λ and μ) and percent contributi on of the flesh to overall firmness (y) during a 186 days cold storage (2°C, 96% hr). Golden Delicious apples: mean value.