Document Type : Research Paper

Authors

1 M. Sc. Student of Mechanical Engineering of Agricultural Machinery, Department of Mechanical Engineering of Biosystems, Faculty of Agriculture, University of Shahrekord

2 Assistant Professor, Department of Mechanical Engineering of Biosystems, Faculty of Agriculture, University of Shahrekord,

3 Lecturer, Department of Mechanical Engineering of Biosystems, Faculty of Agriculture, University of Shahrekord

Abstract

In this research the effects of moisture content and cutting speed on the specific shearing energy and shearing stress for four variety of almond tree (Mamayy, Rabi, Sefid and Shahrodi12) was investigated and results the each any the varieties were compared with each other. Shear properties of almond wood varieties in this study, using a universal testing machine manufactured STM20 Sntam was determined. Knife bevel form of one-sided and edge angle is 40 degree.The characteristics at three moisture levels of 18, 25 and 45% (w.b.) wet basis, three cutting speed levels of 20, 30 and 40 mm/min and in three size 6, 9 and 12 mm were determined. The results of analysis of variance (ANOVA) showed specific shearing energy and shearing stress to all test factors were response significant (P<0.01). The results showed that Both specific shearing energy and shearing stress increased with an increase in moisture content. While increasing cutting speed of 20 to 40 mm per minute, these values are reduced. Based on the results of the study the average specific shearing energy were determined for varieties Mamayy, Rabi, Sefid and Shahrodi12 59.41, 56.088, 54.38 and 77.57 J/ mm2 respectively and for shearing stress, 16.01, 14.34, 13.73 and 19.35 MPa, respectively. Also, the study effect of test factor in the shear test results can be explained factors moisture content and variety most effect and relatively less effect in cutting speed factor.

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Main Subjects

-Annoussamy, M., Richard, G., Recous, S. and Guerif, J., 2000. Change in mechanical properties of wheat straw due to     decomposition and moisture. Applied Engineering in Agriculture, 16(6): 657–664.
- Anonymous. 2008. Food and Agriculture Organization Statistics. Available from: FAOSTAT. www.fao.org.
- ASAE Standards, 52nd Ed, 2006. S358.2: 1:1 measurement - forages. St. Joseph, MI: ASABE.
- Cakır, E., Jhonson, C.E., Raper, R.L. and Schafer, R.L., 1997. Bitki artıklarının toprak zeminde kesilmesinin mekanigi.  [The mechanics of cutting plant residues on a soil surface.] Proceedings of 17th National on Congress Agricultural  Machinery, Tokat, Turkey, pp 966–974.
-Chattopadhyay, P.S. and Pandey, K.P., 1999. Mechanical properties of sorghum stalk in relation to quasi-static  deformation. Journal of Agricultural Engineering Research, 73(2): 199–206.
-Chen, Y., Gratton, J.L. and Liu, J., 2004. Power requirements of hemp cutting and conditioning. Biosystems Engineering,  87(4): 417–424.
-Dang, A.R. and Thakare, S.K., 2010. Force and energy required for cutting pigeonpea stems. International Journal of  Agricultural Engineering, 3(2): 272 -274.
-Esehaghbeygi, A., Hoseinzadeh, B., Khazaei, M. and Masoumi, M., 2009. Bending and shearing properties of wheat stem  of alvand variety. World Applied Sciences Journal, 6(8): 1028–1032.
-Heidari, A. and Chegini, G.R., 2011. Determining the shear strength and picking force of rose flower. Electronic Journal  of Polish Agricultural Universities, 14(2): 1-14.
-Hoseinzadeh, B., Esehaghbeygi, A. and Raghami, N., 2009. Effect of moisture content, bevel angle and cutting speed on  shearing energy of three wheat varieties. World Applied Sciences Journal, 7 (9): 1120-1123.
-İnce, A., Uğurluay, S., Güzel, E. and Özcan, M.T., 2005. Bending and shearing characteristics of sunflower stalk residue.  Biosystems Engineering, 92(2): 175–181.
-Kanafojiski, C.Z. and Karwowski, T., 1972. Agricultural Machines, Theory and Construction, Vol. 2. US Department of  Commerce, National Technical Information Service, Springfield, Virginia, pp 25–60.
-Mohsenin, N.N., 1970. Physical Properties of plant and animal materials. Gordon and breach science publishing co., New  York pp 78-97180.
-Nazari Galedar, M., A. Tabatabaeefar, A. Jafari, A. Sharifi and S. Rafee. 2008. Bending and shearing characteristics of  alfalfa stems. Agricultural Engineering International: the CIGR Ejournal,  Vol. 10.
-O’Dogherty, M.J., Hubert, J.A., Dyson, J. and Marshall, C.J., 1995. A study of the physical and mechanical properties of  wheat straw. J. Agric. Eng. Res., 62: 133-142.
-Prasad, J. and Gupta, C.B., 1975. Mechanical properties of maize stalks as related to harvesting. Journal of Agricultural  Engineering Research, 20(1): 79–87.
-Sitkei, G., 1986. Mechanics of Agricultural Materials. Elsevier Sciences, New York.
-Tavakoli, H., Mohtasebi, S.S. and Jafari, A., 2009. Effect of Moisture Content and Loading Rate on the Shearing    Caracteristics of Barley Straw by Internode Position.Agricultural Engineering International: the CIGR Ejournal, 11(2):45-51