Determination of rupture force, deformation at rupture point, rupture energy and Toughness of strawberries (Fragaria vesca L) in uniaxial compresive test Supervisor :

Shahi Ghujeh, Foad (2017) Determination of rupture force, deformation at rupture point, rupture energy and Toughness of strawberries (Fragaria vesca L) in uniaxial compresive test Supervisor :. Masters thesis, University of Mohaghegh Ardabili.

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Text (تعیین نیروی گسیختگی، تغییر شکل در نقطه گسیختگی، انرژی گسیختگی و چغرمگی توت فرنگی در بارگذاری فشاری تک محوری) Foad Shahi Ghujeh.pdf Download (1MB) | Preview

Abstract

In this study, Some of physical and mechanical properties of strawberry fruit of two Dyamnt and Paros varieties in loading speeds of 10, 35, 60 and 85 mm per minute and two longitudinal and lateral direction in 8 replications in a factorial experiment in completely randomized design were investigated. Also, some of geometric and frictional properties of strawberry fruit of two Dyamnt and Paros varieties including average volume, length, diameter, weight, and friction coefficient in five surface of steel, aluminum, galvanized, wood and iron have been determined. Data analysis was performed using MSTATC statistical software. The results showed that The main effect of the variety and the main effect of the type of static friction surface was significant at the 1% level. And the interaction between variety and type of friction surface is significant at 5% level. The galvanized surface showed the highest static friction coefficient with 0.328 for Paros variety and the level of aluminum showed the highest static friction coefficient with 36.22 for Diamant variety.Also, some of mechanical properties of strawberry fruit of two Dyamnt and Paros varieties including deformation at the point of failure, rupture force, energy fracture and toughness in a factorial experiment in a completely randomized design with 3 factors, including 2 varieties (Diamant and Parus), 4 loading speeds (10, 35, 60 and 85 mm / min) and 2 loading direction (longitudinal and lateral) under compressive loading was determined.The results showed that the highest toughness and rupture force for Paros variety was obtained at the loading speeds of 60 mm per minute in lateral direction and the lowest ruggedness and rupture force for Diamant was obtained at a speed of 10 mm / min in the lateral direction.The results showed that the main effect of loading speed on the rupture force, rupture energy and toughness were significant at the 1% level but it is not significant for deformation at the point of failure. And the main effect of variety was significant at 1% level on all mechanical properties.And the triple interaction of loading speed × direction loading × variety is not significant for any of the mechanical properties.

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