Electronic Journal of Polish Agricultural Universities (EJPAU) founded by all Polish Agriculture Universities presents original papers and review articles relevant to all aspects of agricultural sciences. It is target for persons working both in science and industry,regulatory agencies or teaching in agricultural sector. Covered by IFIS Publishing (Food Science and Technology Abstracts), ELSEVIER Science - Food Science and Technology Program, CAS USA (Chemical Abstracts), CABI Publishing UK and ALPSP (Association of Learned and Professional Society Publisher - full membership). Presented in the Master List of Thomson ISI.
2011
Volume 14
Issue 2
Topic:
Agricultural Engineering
ELECTRONIC
JOURNAL OF
POLISH
AGRICULTURAL
UNIVERSITIES
Heidari A. , Chegini G. 2011. DETERMINING THE SHEAR STRENGTH AND PICKING FORCE OF ROSE FLOWER, EJPAU 14(2), #13.
Available Online: http://www.ejpau.media.pl/volume14/issue2/abs-13.html

DETERMINING THE SHEAR STRENGTH AND PICKING FORCE OF ROSE FLOWER

Adel Heidari1, Gholam Reza Chegini2
1 Department of Agrtechnology, College of Aboureihan, University of Tehran, Iran
2 Department of Agrotechnology, College of Aboureihan, University of Tehran, Iran

 

ABSTRACT


In this research the effect of bevel angle and shear velocity on shear strength and shearing energy of rose flower (Rosa hybrid L.) stem was studied by using direct shear test. Also, the effects of picking velocity, stretch direction and sample groups (near growth tip, near root internode) on force and energy required to pick up the leaves were studied. All experiments were carried out by Instron Universal Test Machine. The average values of shear strength and energy per unit were estimate 1.63 MPa and 5.16 mJ·mm-2, respectively. With increasing the shear velocity, from 10 to 500 mm·min-1 the average values of shear strength and energy per unit area decreased. Picking force and energy data ranged from 4.5 to 12.2 N and from 8.6 to 16.9 mJ·mm-2, respectively. The effects of picking velocity on tensile strength and energy per unit area was significant (P = 1%). The effects of stem position and stretch direction on tensile strength and energy per unit area were significant.

Key words: rose flower, stem, mechanical properties, shear strength, picking force.


Adel Heidari
Department of Agrtechnology,
College of Aboureihan, University of Tehran, Iran
Pakdasht, 3391653775, Iran
email: heidariadel@ymail.com

Gholam Reza Chegini
Department of Agrotechnology, College of Aboureihan, University of Tehran, Iran
Pakdasht, 339163775, Iran
phone: +98 292 30 406 14, fax: +98 292 30 407 46
email: chegini@ut.ac.ir

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