Influence of Knife Bevel Angle, Rate of Loading and Stalk Section on Some Engineering Parameters of Lilium Stalk

Publish Year: 1391
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:

JR_IJEE-3-4_007

تاریخ نمایه سازی: 1 اردیبهشت 1393

Abstract:

Some physical and mechanical property testing of main stalks of Lilium was conducted to provide information for future automatic machine design. Shear, compression and bending properties of Lilium stalkswere determined with using a universal testing machine. The experiments were conducted at three rate ofloading levels from 30 to 50 mm/min, three knife bevel angle levels from 30 to 60 degree and at two levels the stalk; upper and lower. The results showed that all the mentioned above parameters had significant effect on the measured mechanical properties (P<0.01). In all three loading rate, an increasing the shear strength andspecific cutting energy were observed as the knife bevel angle increased. The highest compression strengthand specific compressing energy were 6.86 MPa and 21.34 mJ/mm2 at the lower level, while the lowest compression strength and specific compressing energy were 2.90 MPa and 10.69 mJ/mm2 at the upper level. As the loading rate of the stalk increased, the bending strength decreased, indicating a reduction in the brittleness of the stalk. The average values for modulus of elasticity were found to be 23.48 and 15.96 MPa for stalk regions of upper and lower, respectively

Keywords:

Bending /Compression/ Lilium/ Physical properties/ Shear strength/ Stalk

Authors

adel heidari

Department of Agrotechnology, College of Abuoreihan, University of Tehran, Tehran, Iran

gholamreza chegini

Department of Agrotechnology, College of Abuoreihan, University of Tehran, Tehran, Iran

Mohammad Hossein kianmehr

Department of Agrotechnology, College of Abuoreihan, University of Tehran, Tehran, Iran

seyed reza hassan-beygi

Department of Agrotechnology, College of Abuoreihan, University of Tehran, Tehran, Iran