. American engineer and railroad journal . — ) (3) The bending moment at the center of the axle, X, L; then we have:M = .3151 WL — W (4) Now, if we assume the hub located the same as with theM. C. B. wheel; that is, 48% inches face to face of hub, X becomes becomes: and the moment at the wheel seat .3151 WL + .489 W • (5) Equations (4) and (5) have been substituted for M in the formula, d V- M in which d is the diameter and .0982f f the fibre stress per square inch, the latter being taken at22,000 lbs., and the results plotted as shown in the accompany-ing d
. American engineer and railroad journal . — ) (3) The bending moment at the center of the axle, X, L; then we have:M = .3151 WL — W (4) Now, if we assume the hub located the same as with theM. C. B. wheel; that is, 48% inches face to face of hub, X becomes becomes: and the moment at the wheel seat .3151 WL + .489 W • (5) Equations (4) and (5) have been substituted for M in the formula, d V- M in which d is the diameter and .0982f f the fibre stress per square inch, the latter being taken at22,000 lbs., and the results plotted as shown in the accompany-ing diagram, showing diameter curves for values of W rang-ing from 10,000 to 45,000 lbs., and values of L ranging from76 inches to 80 inches, inclusive. In the same manner thebending moment for the journal is substituted in the equationfor diameter, the fibre stress being assumed at 10,000 lbs. persquare inch. The bending moment is here simply M = .5WJ, Value ot W Pounds ggg88888881fl88g88ggggg8ggggg8gg| ; -MTOfWffl11ffff lu < - Tftl. MM . k j DlatMOC tMtVMD at ■ - Dlituot-Cootci hi CenUi v .,,.,,1. A ,. Diagram for Determination of Limit Diameters of Car andTender Axles. Note—This diagram was accidentally made too small. It will be repro-duced in our next number.—Editors. and results are plotted for a range between 4 inches and Ginches for J. The factor, L, is found in the manner described by Mr. Nelson, in a communication to the M. C. B. Association in1901, viz.: L = A + 2C + R+% inch;L + K — A — 2R and also J = . 2 The horizontal lines at the upper part of the diagram repre-sent values of L, and those in the lower group values of J;the vertical lines represent the total load, W, on one axle,and the groups of curved lines represent the diameters at cen-ter Di, at wheel seat Ds, and at journal Da, respectively, for cor-responding values of W and L, and W and J. As a convenient example showing the application of the dia-gram, let u
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
