MEASURING THE DEGREE OF LOCAL MADE SUB SOIL PLOW CHISEL FRAME TOLERANCE TO APPLIED STRESSES AND ITS FIELD PERFORMANCE

Abstract

A tow–stage study was conducted in the laboratories of mosul Technical Institute in 2005, It aimed, specifying the mineral, chimerical and mechanical aspects of a sub soil plow. After that its basic dimensions were stated in order to show its design and structure by applying (ANSYS) programme as to analyse its which are stresses and show its degree of tolerance to this stresses resulting a simulated conditions as possible. A number of situations were tested such as stress toward axis (X, Y, Z), also, the principle-stress σ1 and σ2 (N/mm2) and Deflection (mm). Secondly, the filed estimation of the plow performance was tested which forward speed factor appliedcn tow together 2.52, 3.60 Km/h was adopted and studying their effect on some characterstics such as depth and width of the drill and percentage the percentage of lateral adge and the number of prominent soil blocks which have diameters exceeding (10) cm/m2. The results show the plow surface hardness was 350 HB while yield stress reached (864N/mm2) and tensile strength was (1125N/mm2), In the middle of the chisel the hardness was less than 184 HB, yield stress (417N/mm2) and tensile strength 625 N/mm2, analysis of the chisel stress shows that. The principle stress were 119.98 N/mm2, followed by Von-Mises 111.12 N/mm2 compared with other stress. As the speed was concerned there was no significant difference in drill depth, width of lateral edges and the number of prominent soil blocks while 2.52 Km/h speed had the widest drill 22.90 cm as compared with 3.60 Km/h.