Machinists' and draftsmen's handbook, containing tables, rules and formulas, with numerous examples explaining the principles of mathematics and mechanics as applied to the mechanical trades; intended as a reference book for all interested in mechanical work (1910)
Lobben, Peder, 1858- · New York, D. Van Nostrand company · leaf 313
1. Find approximately the rectangular moment of inertia fora surface (or section of :a beam) 6 X 2, about its axis xy.(See Fig 7,) Divide the surface into narrow strips, as a, fi, c\ d< e, f, g,A, i,j. k, /, and multiply each strip by the square of its distancefrom the neutral axis, xy, and the… … g — 2 X % X ( X)2 = 0.0625//. — 2 X y2 X ( % Y — 0.5625 z = 2 X % X (IX)2 = 1.5625j = 2 X y2 X (IX)2 = 3.0625k = 2 X y2 X (2X)2 = 5.0625 l—2Xy2X (2X)2 = 7.5625 Moment of inertia = 35.75 (approximately). The correct value for the least rectangular moment ofinertia for such a surface is obtained by…
Mechanical engineering
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