Strength of Materials & Structures

Strength of Materials & Structures

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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. 1892 edition. Excerpt: ...First, that with parallel shears, the shearing force required is equal in either position of the bar. Second, that with inclined shears, the shearing force is 20 per cent. less for the bars on the flat, than it is for the same bars on edge. Third, that when the bars are cut when placed on edge, only 8 per cent. is saved by using inclined shears. Fourth, that when bars are sheared on the flat, a saving of 26 per cent. is effected by the inclined, as compared with the parallel shears. CHAPTER XI. ON THEi IMPORTANCE OF UNIFORMITY OF SECTIONAL AREA. In designing machines or structures, not only is there a correct form, but it is of the greatest importance, that that form should not be departed from unnecessarily. The correct form is that, in which every part is proportioned to the straining action to which it is subjected, so that the stress reaches the same maximum limit on every section. If, instead of being thus proportioned, a structure has a surplus of material in some parts, that surplus may not only not strengthen it, but may positively weaken it, and may render parts, otherwise of sufficient strength, incapable of sustaining the load for which they have been calculated. Thus, for example, a chain with one link smaller than the others, a shaft with one journal of insufficient diameter, or a tie-rod nicked at any point, is reduced in strength, not only in proportion to the reduction of section at the weak point, but in a still greater degree. In consequence of the surplus resistance in the other parts, most of the elastic work will be concentrated on the weak link, the weak journal, or the nicked section of the tie, as the case may be, and those parts will gradually be more weakened, and at last overcome, before the other parts of the more

Product details

  • Paperback | 82 pages
  • 189 x 246 x 4mm | 163g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236626583
  • 9781236626585