Experiment Analysis On Material Properties Of Gorgons (Euryale Ferox)

Gorgons have high nutrient, healthy and economic value, so it’s meaningful to design efficient processing machinery of gorgons. In this research, the basic properties, mechanical properties, friction properties, suspension properties, optical properties and electrical properties of gorgons(included whole gorgons, gorgon shells and nutlets) were determined by different experiments, the correlations between different material properties and corresponded influencing factors(included maturity, moisture content, type and direction of force, contact material, particle size, et al.) were analysed, and the mechanism of variation was discussed. Main conclusions of this research are shown as follows:1) The basic properties of gorgons were determined. The results showed:triaxial dimension, geometric mean diameter, triaxial arithmetic mean diameter, sphericity and surface area of whole gorgons, thickness of gorgon shells and diameter of gorgon nutlets didn’t vary with the variation of maturity; the moisture content of whole gorgons, gorgon shells and nutlets decreased with the increase of maturity; thousand and single grain weight of whole gorgons, single grain weight of gorgon shells and nutlets and their densities decreased linearly with the increase of moisture content; single grain volume of whole gorgons, gorgon shells and nutlets didn’t vary with the variation of moisture content.2) The mechanical properties of gorgons were determined. The results showed:the strain-stress curves of whole gorgons in compression and shear tests were similar when they cracked, but the originating location and extending modes of cracks were different; the breaking force, deformation, strain energy and strain energy density of whole gorgons and gorgon nutlets increased with the decrease of moisture content; it was easier to break whole gorgons by using sheared force which perpendicular to the direction of navel; the all mechanical properties of gorgon nutlets were less than which of whole gorgons.3) The friction properties of gorgons were determined. The results showed:static sliding friction angle of whole gorgons, gorgon shells and nutlets, angle of repose of whole gorgons were maximal on the non-woven but minimal on the stainless steel plate, the surface roughness of contact materials was main factor affecting them; there weren’t obvious correlations between gorgon shells and nutlets and moisture content; it had a good effect to separate gorgon shells and nutlets by using an inclined plane with non-woven or rubber material; static sliding friction angle, internal friction coefficient and angle of repose of whole gorgons at the same moisture content decreased with the increase of particle size; internal friction coefficient and angle of repose of whole gorgons in the same particle size increased with the increase of moisture content.4) The suspension properties of gorgons were determined. The results showed: suspension velocity of whole gorgons and gorgon nutlets decreased nonlinearly with the increase of moisture content; suspension velocity of gorgon shells didn’t vary with the variation of moisture content; suspension velocity of gorgon shells and nutlets would be overlapped very likely, it’s difficult to separate gorgon shells and nutlets by using airflow.5) The optical properties of gorgons were determined. The results showed:lightness, yellowness and blueness and hue angle of whole gorgons(gorgon shells) decreased nonlinearly with the increase of moisture content; redness and greenness increased with the increase of moisture content; metric chroma decreased firstly then increased with the increase of moisture content; lightness and hue angle of whole gorgons(gorgon shells) were affected obviously by moisture content, but redness and greenness, yellowness and blueness and metric chroma were less affected; the chromatism of whole gorgons(gorgon shells) at different moisture contents was very obvious, it’s scientific to determine the maturity of gorgons by observeing their colors and chromatisms; the optical properties of gorgon nutlets didn’t vary with the variation of moisture content, and they were very different from which of whole gorgons(gorgon shells).6) The electrical properties of gorgons were determined. The results showed:the absolute electrical conductivities of whole gorgons and gorgon nutlets didn’t vary with the increase of moisture content; the increased value of electrical conductivity in unit mass caused by extravasated electrolytes of cells didn’t vary with the variation of moisture content; the absolute electrical conductivities of gorgon nutlets were less than which of whole gorgons.