نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانش‌آموخته کارشناسی ارشد گروه مهندسی مکانیک بیوسیستم، دانشکده کشاورزی، دانشگاه شهرکرد، شهرکرد ایران
2 گروه مهندسی مکانیک بیوسیستم
3 مربی گروه مهندسی مکانیک بیوسیستم، دانشکده کشاورزی، دانشگاه شهرکرد، شهرکرد، ایران
4 استادیار و عضو هیات علمی گروه علوم باغبانی، دانشکده کشاورزی، دانشگاه شهرکرد، شهرکرد، ایران
چکیده
کلیدواژه‌ها
عنوان مقاله [English]
نویسنده [English]
Today, horticultural crops are often harvested mechanized in developed countries, so to
design devices such as shakers used for harvesting, and we must have the necessary
information about the wood of the branches and trunks of trees so that we can harvest with
minimal damage. Therefore, the mechanical properties of almond and walnut wood, including
shear modulus, yield stress, fracture stress, toughness, and germination modulus, were
investigated to distinguish these values between healthy and unhealthy wood and the effects
of factors such as storage time, moisture, diameter, cutting speed and condition of wood of
two different wood products (almond and walnut) were investigated, and the results were
compared. The condition of the wood was in two types, healthy, which did not have any
worm corrosion, and unhealthy, which the Zeozera Pyrina damaged. The results of the
analysis of variance of the main factors and their interaction in almond wood showed that the
main factors of cutting speed and healthy and unhealthy and the interaction effects of two
factors of cutting speed and year (shelf life), cutting speed and healthy and unhealthy, cutting
speed and moisture. They had a significant effect on the 5% probability level. In walnut
wood, the effect of the main factor of moisture and the interaction of healthy and unhealthy
and humidity were significant at 5% probability. With increasing cutting speed in almond
wood, the shear modulus increased from 28 to 32 and then to 39 MPa, respectively, the stress
at the yield point increased from 26 to 28 and then to 45 MPa, and the stress at the breaking
point increased from 20 to 32 MPa. It had more moisture and was more flexible. It was seen
more than wood, which had less moisture. Also, these values in walnut wood with higher
moisture decreased more than in wood with less moisture.
کلیدواژه‌ها [English]
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