. The Encyclopaedia Britannica; ... A dictionary of arts, sciences and general literature. ndeed, the actual shearing describeddees not correspond with any simple homogensous stress,and the form of the cross section shorn through must exer-cise considerable influence on the strength of the piece toresist shearing. In a round pin the maximum intensityof shearing stress is | of the mean intensity, and in a rect- STRENGTH OF MATERIALS.!. B K I D G E S 287 angular pin f of the mean intensity. See Steenqth ofMaterials. The pins which join the links of suspension bridges, andthe rivets which join th
. The Encyclopaedia Britannica; ... A dictionary of arts, sciences and general literature. ndeed, the actual shearing describeddees not correspond with any simple homogensous stress,and the form of the cross section shorn through must exer-cise considerable influence on the strength of the piece toresist shearing. In a round pin the maximum intensityof shearing stress is | of the mean intensity, and in a rect- STRENGTH OF MATERIALS.!. B K I D G E S 287 angular pin f of the mean intensity. See Steenqth ofMaterials. The pins which join the links of suspension bridges, andthe rivets which join the wrought iron plates of girderbridges, are subject to shearing stress, and the area to boshorn through must be made sufficient to bear the totalshearing stress on that part of the structure. Wood isstrong to resist tension, and would be much employed forties but for the difficulty of taking hold of the ends of thetie in such a way that these ends shall not fail by being shorn. Fig 4 shows the end of a balk of wood with a strapbolted to it. This strap would be torn oflf by the shearing. Fig. 4. of the wood along the dotted lines ah and cd, with a stresswhich would be much less than that required to overcomethe tenacity of the wood ; for if the dimensions of the balkof pine are 6 in. by 2 in. with an. inch hole, its tensilestrength will be 10 x 5 or 50 tons, while if the boltbe 1 inch diameter, and be placed 4 inches from one end,it could be torn out by shearing 16 inches of the wood;now each inch will only resist a shearing stress ofsay 600 E), so that the bolt would be torn out with only43 tons. Thus at least eleven such bolts, each 4 inchesfrom its neighbour, and occupying 3 feet 8 inehes in lengthof this balk, with an iron strap of corresponding length,would be required to render the full strength of the balkas a tie available. A similar difficulty is met with whentimber is joined, as in fig. 5, where shearing would takeplace along the dotted lines AB or CD.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectencyclo, bookyear1902
