PENETRATION AND STRESS-STRAIN BEHAVIOR OF POTATO TUBERS DURING STORAGE

Document Type : Original Article

Authors

1 Prof. of Food Eng., Fac. of Ag., Alexandria Univ. Egypt.

2 Researcher., Ag. Eng. Res. Inst., Ag. Res. Center, Ministry of Ag., Egypt.

Abstract

The aim of this investigation is to study the Penetration and stress-strain behavior of Lady Rosetta potato tubers variety as destructive tests under different storage conditions. An Instron machine was used for stress-strain tests. Force deformation tests of fresh potato tuber show that the small tubers have a more strength than that for big tubers for each soil cultivars. The fresh harvested tubers tend to be very brittle. Because of their brittleness, potato tubers tissues were cracked under compression test. The result appears that yield strain, increases gradually with increasing storage time. Rupture force, rupture strain, rupture stress, and toughness decreases gradually with increasing storage time. Yield force, yield stress, resilience, initial modulus of elasticity and secant modulus of elasticity decreases gradually with increasing storage time. Penetration forces (N) of fresh tubers were measured. The penetration force was ranged from 19.080 to 26.389 within average of 22.306 for sand soil cultivars, while ranged from 18.246 to 32.785 with an average of 24.413 for black soil cultivars, using probe of 3.8 mm diameter.

Main Subjects

References

Baritelle, A.t., G.M. Hyde, (1999). Effect of tuber size on the failure properties of potato tissue. Trans. of the ASAE 42, 159-161.
Burton WG.(1989). Post-harvest physiology. In: WG BURTON. Ed. The Potato, 3rd Ed. Longman Singapore Publishers (Pte) Ltd, Singapore.423 -522.
Fekete, A, and P. Sass. (1994). Elasticity characteristics of fruits. International symposium on postharvest treatment of horticultural crops. Proceedings a conference held in Kecskemet, Hungary, 30 August -3 September 1993. Acta Horticulture, 368: 199–205.
Ghadge, A.D.; M.G. Britton; and D. S. Sayas (1989). Moisture content determination for potatoes. Transactions of the ASAE, 32(5): 1744-1746.
Konstankiewicz ,K., K. Pawlak and A.Zdunek. (2001). Influence of structural parameters of potato tuber cells on their mechanical properties. International Agrophysics, 2001,15, 243-246.
Mohsenin, N.N. (1986). Physical Properties of Plant and Animal Materials. Gordon and Breach Science Publishes. New York, USA.
NPC, (Journal of National Potato Council), Jul 2016, Washington, D.C., USA).

Files

Share

How to cite

Statistics