. Railway mechanical engineer . g. The equation of the straight line marked Actual Shear-ing Efficiency is: A,NjEsj = ——- (P,E, —C) A,P, where: = Efficiency due to shear of all of the rivets in scam tion represented by the straight = Area of rivet hole in scam under ~ M^..° »«*.oe in scam No. 1. represented by the curved \. = Nurnbcr of rivet shearing planes of seam under investigation. all scams plotted en this sheet, Nj equals T. p! t , ■ oMVjic row of seam under , = Pitch of rivets in outside row of seam. No. = Efficiency of sea
. Railway mechanical engineer . g. The equation of the straight line marked Actual Shear-ing Efficiency is: A,NjEsj = ——- (P,E, —C) A,P, where: = Efficiency due to shear of all of the rivets in scam tion represented by the straight = Area of rivet hole in scam under ~ M^..° »«*.oe in scam No. 1. represented by the curved \. = Nurnbcr of rivet shearing planes of seam under investigation. all scams plotted en this sheet, Nj equals T. p! t , ■ oMVjic row of seam under , = Pitch of rivets in outside row of seam. No. = Efficiency of seam. No. , = Pitch minus twice diameter of rivet hole in the seam. No. 1. At a point representing per cent efficiency for seamNo. 1 is a vertical dotted line which is the efficiency of the investi ga- in 140 RAILWAY MECHANICAL KXGIXEEK Vol. 92, No. 3 scam through tlic first row of rivets. If the tliickness andtensile strength of plate are such tliat the efficiency for seam t^ou/ -bffjay spuncy ui tjoi9u3>£. No. 1 is higher than per cent and is .ihown on theright of the dotted line, the higher efficiency should not beconsidered as the seam would fail through the first row ofrivets which has an efficiency of per cent. At tlie rightend of the straight lines representing seams No. 2, 3 and 14are the points where failure will occur in the first row ofrivets and tliese points represent the maximum efficiency ofthe seams. The co-ordinate field is not large enough to showsimilar points for seams No. 15, 57 and 64. Problem 1.—To find the efficiency of boiler seam No. 1having I/x-in. plate, the tensile strength of which is 58,000lb. From the point of intersection of the 58,000 lb. line on thehorizontal scale and the curve representitig a IJ/^-in. plate,project a line vertically either to the top or bottom axis andread off the efficiency, which is per cent. Problem 2.—To find the efficiency of boiler seam No. 2having l^^-in. plate, the tensile st
Size: 945px × 2645px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
