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 . FiG. 307. .-. max.(jp1+jp2)= lo+y, -1]-. Fig. 308. Fig. 309. Fig. 310. 9000 lbs. per sq. inch, very nearly, compression. This i is m 362 MECHANICS OF ENGINEERING. the upper outer fibre close under B. In the lower outer fibrejust under B we haye a tension = p2 ~Pi — 7,200 lbs. persq. in. (It is here supposed that the beam is secure againstyielding sideways.) 300. Strength of Hooks.—An ordinary
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 . FiG. 307. .-. max.(jp1+jp2)= lo+y, -1]-. Fig. 308. Fig. 309. Fig. 310. 9000 lbs. per sq. inch, very nearly, compression. This i is m 362 MECHANICS OF ENGINEERING. the upper outer fibre close under B. In the lower outer fibrejust under B we haye a tension = p2 ~Pi — 7,200 lbs. persq. in. (It is here supposed that the beam is secure againstyielding sideways.) 300. Strength of Hooks.—An ordinary hook, see Fig. 309,may be treated as follows: The load being = P, if wemake a horizontal section at AB, whose gravity axis g isthe one, of all sections, furthest removed from the line ofaction of P, and consider the portion C free, we have theshear = J = zero (1) the uniform pull = p^F—P . . (2) while the moment of the stress-couple, from 2 () =0,is ?*I=Pa (3) e For safe loading pi + must = B, b=p[^+t] • • • • (4) Tt is here assumed that e = el9 and that the maximum\_P1-\-p2] occurs at AB. 301 Crane.—As an exercise let the student investigate thestrength of a crane, such as is shown in Fig. 310. FLEXUKE.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectenginee, bookyear1888
