Determination of pear bruises due to a thin edge compression load by CT scan method

Document Type : Research Article


1 Associate Professor of Department of Bio-System Mechanical Engineering, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran.

2 Msc. Student of Department of Bio-System Mechanical Engineering, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran.


In this research via CT scan, the relationship between physical properties of pears and storage times with bruise due to loading force was investigated. Before loading and storing, 50 pears were examined using CT scan and 27 pears with zero bruise percentage were selected. Dimensions of pears (length, width, thickness) were measured, then properties such as the equivalent diameter, geometric mean diameter, spherical coefficient, surface area and aspect ratio of calculus were calculated, then selected pears were subjected to quasi-static loading with a thin edge pressure with three forces of 15, 20 and 25 N and 5, 10 and 15 days storage was used to investigate the effect of forces on pears. Then, after loading and storing, using the CT scan in each period of storage, the rate of pear bruise was calculated. The results of the experiments showed that there is an inverse relation between geometric diameter, arithmetic and equivalent diameter, spherical coefficient and aspect ratio with the bruise percentage. Also, a direct and unreasonable relationship between the level of the surface area and the percentage of bruising was obtained. Also, according to the obtained results, during the 5-day storage period, the amount of geometric diameter, arithmetic and equivalent diameter, spherical and aspect ratio on the percentage of bruising were not significantly affected and percentage of bruising can be almost zero and with increasing storage, the above parameter's will affect the percentage of bruising.

Graphical Abstract

Determination of pear bruises due to a thin edge compression load by CT scan method


  • The equivalent diameter at each of the three edge-loading forces has an inverse relationship with the percentage of bruising.
  • There is a direct and non-significant relationship between the surface levels with the percentage of bruise.
  • Geometric and arithmetic diameters, spherical and slenderness ratio coefficients are inversely correlated with percentage of bruising.
  • In 5-day storage, geometric, arithmetic and equivalent diameters, spherical and slenderness coefficients had no effect on the percentage of bruising.
  • At forces of 15 and 25 N, geometric diameter was inversely correlated with the percentage of bruising and the higher geometric diameter increased the bruising.


Main Subjects

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