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Effets des caractéristiques de température et de charge sur les propriétés mécaniques (application de contrainte ou non) des baies d'argousier. 1ere partie. Tests de compression.

Effects of temperature and loading characteristics on mechanical and stress-relaxation properties of sea buckthorn berries. Part 1. Compression tests.

Auteurs : KHAZAEI J., MANN D. D.

Type d'article : Article

Résumé

The force and energy required to rupture the sea buckthorn berry were measured using the plate test at loading velocities ranging from 0.1 to 4.0 mm/s and ambient temperatures of 4.5, 16.5, 25, and 34.5°C. As berry temperature increased from 4.5 to 34.5°C, the rupture force decreased 20.7%. There were no significant differences in rupture energy at temperatures of 16.5, 25, or 34.5°C; but the rupture energy was significantly higher at 4.5°C. Average berry deformation was 1.5 mm and did not vary with temperature.Consequently, berry firmness decreased as temperature increased. The rupture force and energy for large berries was significantly higher than that for small berries at 16.5 o C, however, the small berries were firmer. Loading velocity had a significant effect on rupture force, rupture energy, deformation, and firmness of berries of the Sinensis cultivar, but there was no effect on berries of the Indian Summer cultivar. For these two cultivars, berry masses and geometric mean diameters ranged from 0.14 to 0.38 g and from 6.2 to 8.8 mm, respectively; with the Sinensis berries being more spherical.

Détails

  • Titre original : Effects of temperature and loading characteristics on mechanical and stress-relaxation properties of sea buckthorn berries. Part 1. Compression tests.
  • Identifiant de la fiche : 2004-2873
  • Langues : Anglais
  • Source : Agric. Eng. Int. - vol. 6
  • Date d'édition : 2004

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