Study On Compression And Creep Characteristics Of Hami Melon

Hami melon is a special fruit of Xinjiang.The influence of Xinjiang’s geographical location,weather and other reasons makes the Hami melon taste sweet and has high nutritional value.These reasons make Hami melon can be sold at home and abroad.However,the transportation of Hami melon mainly depends on land transportation,but because of the different length of transportation,Hami melon will cause certain mechanical damage during the storage and transportation process due to the extrusion between melon and melon.Using the test to study the characteristics of Hami melon compression and creep can provide certain theoretical data for Hami melon picking,grading,packaging,storage and transportation.This study focused on the analysis of the compressive properties,creep roperties of the Hami melon pulp and the cyclic loading characteristics of the whole fruit.The compression characteristics of the Hami melon pulp,such as the destructive ability,the failure stress and the elastic modulus,were analyzed and calculated by studying the compression characteristics of the Hami melon pulp.By studying the creep properties of Hami melon,the creep characteristics of Hami melon flesh were analyzed and analyzed.The data can be used to analyze and judge the damage of Hami melon during storage.Through the cyclic loading test of the whole fruit of Hami melon,the damage area of Hami melon was analyzed and the damage of Hami melon during transportation was analyzed.The study obtained the following results:(1)Because of the different texture of Hami melon pulp,the elastic modulus,failure energy and failure stress of the melon pulp near the peel are higher than that of the Hami melon pulp.The results show that the elastic modulus,failure energy and failure stress of the Hami melon end are higher than the end of the stalk,and all the compression parameters of the equator are the lowest.Changes in the storage time of Hami melon also affect the compression characteristics of Hami melon pulp.The longer the storage time of Hami melon,the smaller the compression characteristic parameter,and the more susceptible the Hami melon is to damage;(2)The Hami melon creep test uses three creep models for fitting comparisons.By observing the test results,it is known that the test fitting results using the Burgers model are better.At this time,the coefficient R~2≥0.96 is determined,and the creep characteristic parameters of the Hami melon pulp are fitted to reflect the damage of Hami melon.It can be seen from the creep-recovery curve that the permanent failure of the melon near pericarp is higher than that of the near-fruit,and the creep value of the end of the Hami melon is higher than that of the caudal end,which is the lowest in the equator.(3)The cyclic loading test of the whole fruit of Hami melon was carried out by changing the maturity,loading times and loading force of the fruit to simulate the pressure of Hami melon during transportation.Finally,the damage area of Hami melon was analyzed and calculated.Through the analysis of the damage area of Hami melon,it can be known that the higher the maturity of Hami melon,the more the loading times and the greater the loading force,the larger the damage area of Hami melon,and the more obvious the damage characteristics of Hami melon.When the loading times of Hami melon is 700 times and the loading force is 150N,the damage area is the largest.This study showed that the mechanical damage of Hami melon during storage and transportation can be preliminarily determined by the compression characteristics,creep characteristics of the Hami melon pulp and the cyclic loading test of the whole Hami melon fruit.This study provides a reliable basis for the design of loss reduction in the later storage and transportation of Hami melon.