Influence of Knife Bevel Angle, Rate of Loading and Stalk Section on Some Engineering Parameters of Lilium Stalk
سال انتشار: 1391
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 896
فایل این مقاله در 8 صفحه با فرمت PDF قابل دریافت می باشد
- صدور گواهی نمایه سازی
- من نویسنده این مقاله هستم
استخراج به نرم افزارهای پژوهشی:
شناسه ملی سند علمی:
JR_IJEE-3-4_007
تاریخ نمایه سازی: 1 اردیبهشت 1393
چکیده مقاله:
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
کلیدواژه ها:
Bending /Compression/ Lilium/ Physical properties/ Shear strength/ Stalk
نویسندگان
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