Study On Static Pressure Damage Law Of Korla Fragrant Pear Based On Electrical Characteristics

This article takes the Korla Fragrant Pear as an example to study the law of the biological yield limit,failure limit,deformation energy and failure energy of the fragrant pear with the compression rate during static pressure damage,at the same time,the pressure of fragrant pear was analyzed with different buffer heads,and preliminary study on the effect of different cushioning materials on the change law of fragrant pear's static pressure damage.The non-destructive testing method of fragrant pear based on electrical characteristics and the variation rule of fragrant electrical parameter value with preload and electrode size during the testing process are analyzed,finally,combining the nondestructive testing of fragrant pear with the static pressure damage characteristics,the relationship between the change value of the electrical parameters of fragrant pear and the damage area was established,a quantitative evaluation method of damage degree based on electrical characteristics is proposed.The main research contents of this article are as follows:(1)Under different compression rates,different placement positions,and different buffer heads,the universal test compressor was used to measure and analyze the change rules of the mechanical characteristics of the static pressure damage of fragrant pear,and to determine the packaging materials and the optimal placement positions with the best protection performance.(2)To study the change of electrical parameter values of fragrant pear under different preload and electrode size,establish the mathematical relationship between preload and electrical parameter value under different electrode sizes,and the mathematical relationship between electrode size and electrical parameter value under different preload relationship,comparative analysis of changes in electrical parameter values.(3)Static pressure damage test and electrical property detection test were carried out on fragrant pears with different maturity degrees,the change rules of fragrant pear electrical parameters under different damage deformation were analyzed,and the mathematical relationship between fragrant pears with different maturity degrees and damage area was determined,so a quantitative evaluation method of nondestructive testing of characteristics is proposed.The results show that the curve distribution rules of compression characteristic parameters under different buffer heads are approximately the same,the biological yield limit,failure limit,deformation energy,and failure energy all increase gradually with the increase of compression rate,and the yield limit and failure limit have extreme values in the process of increasing with the compression rate.When using foam materials for packaging,the mechanical damage of the pear is minimal.The changes of electrode size and preload have certain effects on the electrical parameter values of Korla Pear,but the effect of preload on the electrical parameter values of Korla Pear is more significant.The damage degree of fragrant pears can be expressed by the damage area of fragrant pears.the amount of deformation and changes in electrical parameters can indirectly indicate the degree of fragrant pears'damage.Under the same compression deformation,the higher the ripening degree of fragrant pear,the greater the change of electrical parameters and the larger the damage area.The mathematical equations of the relationship between the change value of the electrical parameters of fragrant pears and the damage area are in accordance with the y=ax~2+bx+c model.This model can quantify the damage degree of fragrant pears with different maturity and provide theoretical guidance for the rapid measurement of fragrant pears'damage degree.