Dynamic elastic properties of some fruits during growth and development

摘要: The dynamic elastic properties of the flesh apples, peaches and pears were evaluated to determine whether these significantly altered during growth, development maturation fruit. Mechanical resonance within specimens removed from fruit was measured various stages development, Young's modulus elasticity, shear modulus, Poisson's ratio internal friction (damping) calculated. for Late Elberta decreased rapidly 1925 × 10 5 dynes/cm 2 three weeks prior estimated date picking maturity 195 two after maturity. Kieffer had a more gradual decline 2884 1151 over three-month growth period. For elasticity generally declined period between 90 115 d full bloom, then remained relatively unaffected and, finally, as ripened on tree. Average values apples at intermediate ranged 780 Mcintosh 1300 Rome Beauty. results measurements higher than those quasi-static tests previously reported apples. pears, (loss coefficient) growing season. After maturation, increased average loss coefficient 0·090 0·143 developed, matured ripened. 0·020 overmature Beauty 0·236 in early stage 0·391 approaching Results indicate that fruits studied have certain measurable mechanical properties, some which change with hence may be value an index or readiness harvest. Further exploitation techniques used this study result better understanding engineering objective characterization textural attributes such commodities.