FRACTURE BEHAVIOR OF TURMERIC (CURCUMA LONGA) UNDER AMBIENT AND CRYOGENIC CONDITIONS

摘要

The present study involves the characterization of fracture properties of spice turmericn(Curcuma longa) under ambient and cryogenic conditions (−54C). Materialnproperties needed for fracture mechanism prediction, particle characterizationnand etheric oil analyses were experimentally determined on turmeric powder producednunder ambient and cryogenic processes. The results of stress-strain behaviornof turmeric showed that there was an increased particle strength, modulus ofnelasticity and maximum stress intensity and decreased strain energy as the size andntemperature was lowered. All forms of size reduction showed decrease in sphericitynas size decreased and were greater for cryogenic grinding as compared to conventionalngrinding. The average work of fracture under ambient and cryogenicnconditions was found to be 8.86 ± 1.74 and 5.66 ± 1.68 J/m2, respectively. Thenstudies showed attainment of better quality parameters under low temperaturenconditions and provide useful engineering data for designing mechanicalnequipment.