Mechanics of engineeringComprising statics and dynamics of solids: and the mechanics of the materials of constructions, or strength and elasticity of beams, columns, arches, shafts, etc . which for the foot-pound-minute system of units gives H. ,000x50x2ttX3-^33,000=57^ H. P. Example 3.—What different radius should be given tothe shaft in Ex. 1, if two radii at its extremities, originallyparallel, are to make an angle of 2° when the given momentof torsion is acting, the strains in the shaft remaining con-stant. From eq. (4) § 217, and the table 210, with a=^07:= radians ( n-measur
Mechanics of engineeringComprising statics and dynamics of solids: and the mechanics of the materials of constructions, or strength and elasticity of beams, columns, arches, shafts, etc . which for the foot-pound-minute system of units gives H. ,000x50x2ttX3-^33,000=57^ H. P. Example 3.—What different radius should be given tothe shaft in Ex. 1, if two radii at its extremities, originallyparallel, are to make an angle of 2° when the given momentof torsion is acting, the strains in the shaft remaining con-stant. From eq. (4) § 217, and the table 210, with a=^07:= radians ( n-measure), and Ip=1/27zri, we have 2,000x36x120 ^, 9,000,000 r= inches. (This would bring about a different ps, but still safe.) Theforegoing is an example in stiffness. Example 4.—A working shaft of steel (solid) is to trans-mit 4,000 H. P. and make 60 rev. per minute, the maximumtwisting moment being \y2 times the average; requiredits diameter. <i= inches. Ans. Example 5.—In example 1, p = 2,930 lbs. per squareinch ; what tensile stress does this imply on a plane at 45°with the pair of planes on which ps acts ? Fig. 219 shows pt dz2 ptdx2.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectenginee, bookyear1888
