Mechanical behavior of Deveci pear cultivar affected by maturation

Abstract

The present study examines the mechanical behavior of 'Deveci' pear cultivar produced in Turkey in terms of harvesting periods. Penetration tests were applied to the determined sides (bloom side, lateral side and stem side) of pear fruit harvested on three different maturation dates (October 5-15-25). According to the test results, it was found that harvesting period had different effects on mechanical properties of pears. Decrease was found in rupture force, rupture energy, deformation and firmness values of pears as the harvest date progressed. Rupture force values were as 52.69, 45.56 and 41.95 N in the first, second and third harvesting dates, respectively. Deformation was 5.57 in the first harvesting date and as 5.12 mm in the third harvesting date. The present study showed that firmness values of mature pear fruit were less. Firmness value was 9.59 N/mm in the first harvesting date and 8.09 N/mm in the third harvesting date. The highest firmness value was found on the stem side of pears.

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“…It was determined by the slope of the first peak of the maximum rupture force and the depth of penetration (rupture deformation), reported in N/mm (Harnkarnsujarit et al, 2016). Rupture energy is determined by calculating the area under the rupture force curve -rupture deformation (Cevher & Öztekin, 2019) at the highest values. When toughness is measured in J/m 3 or a derivative of it, this is a mechanical property and is defined as the amount of energy that a material can absorb in a unit of volume before breaking (Berthaume, 2016).…”