Manual of rules, tables, and data for mechanical engineers; based on the most recent investigations of constant use in calculations and estimates ... [etc.] with tables of logarithms, circles, - Softcover

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1889 Excerpt: ...No. 185; the values of h, the shearing resistance, calculated by the general formula (3 ), page 535, are added. Table No. 185.--Torsional Strength Of Cast Iron. 1819. (Reduced from Mr. Dunlop's data.) It seems that the ultimate torsional strength increased very nearly as the cube of the diameter, and that the average torsional resistance per square inch of section was 8.375 tons. Assuming, as explained at page 561, that the shearing resistance of cast iron is equal to its direct tensile resistance, the general formulas for torsional strength ( 1 ), page 534, and (6 ), page 536, become, by substitution, W = the force, in tons. R = the radius of the force, in inches. WR = the moment of the force, in statical inch-tons. d = the diameter of the round shaft, in inches. b = the side of the square shaft, in inches. s = the ultimate tensile strength, in tons per square inch. 1 Annals of Philosophy, vol. xiii. 1819. If the tensile strength, s, be taken at 7.2 tons, for iron of average quality, then, by substitution and reduction:--Ultimate Torsional Strength and Sizes of Cast-iron Sliafts of average quality. Round shaft, W =-Ll (14) 2.88 Torsional Deflection Of Cast-iron Bars. In the absence of direct data for the torsional deflection of cast-iron bars, it is assumed that it is 1 Yi times that of wrought-iron shafts--the same proportion as that of the transverse deflections of cast-iron and wrought-iron shafts, as indicated by a comparison of the formulas (8), page 564, and (.5)' PaSe 59-Multiply, therefore, the second member of the formula (14), page 592, by 13; the coefficient 1070, or exactly 1073, becomes (1073 x 3/5 = ) 644:--Torsional Deflection of Round Cast-iron Bars. D = J/ (18) 644 d K' STRENGTH OF WROUGHT IRON. Tensile Strength. Mr. Telford deduced from h...

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