A Textbook on Metallurgy of Gold, Silver, Copper, Lead, and Zinc Volume 3

A Textbook on Metallurgy of Gold, Silver, Copper, Lead, and Zinc Volume 3

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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. 1902 edition. Excerpt: ...pounds? Ans. 5J in., nearly. CRUSHING STRENGTH OF MATERIALS. 1947. The crushing strength of any material is the resistance offered by its fibers to being pushed together. If a bar is long compared with its cross dimensions, any slight disturbance from uniformity will cause it to bend sideways under the compressive force, and we have, then, not only compression, but compression compounded with bending. To obtain only compression, the length of a rod should not be more than five times greater than its least diameter, or its least thickness when it is a rectangular rod. Experimental tests on pillars have shown that their strengths are approximately inversely proportional to the squares of their lengths. That is, if there are two pillars of the same material, having the same cross-section, but one is twice as long as the other, the long one will sustain only about one-quarter the load of the short one. 1948. Attention should be given to the ends of pillars, as their shape has great influence upon their strength. In Fig. C38 are shown three pillars with different shaped ends. It has been proved by the aid of higher mathematics that, theoretically, a pillar having flat or fixed ends, as shown at a, is four times as strong as one that has round or movable ends, as shown at c, and one and sevenninths times as strong as one having one flat and one round end, as shown at b; b is thus two and one-fourth times as strong as c. It has also been found that if three pillars, a, b, c, which have the same cross-section, are to carry the same load and be of equal strength, their lengths must be as the numbers 2, 1.1, and 1, respectively. In practice, however, the ends of the pillars b and c are not generally made as shown by the figure, but have holes at their ends...
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Product details

  • Paperback | 164 pages
  • 189 x 246 x 9mm | 304g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236506057
  • 9781236506054