Blast Furnace and Steel Plant Volume 8

Blast Furnace and Steel Plant Volume 8

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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. 1920 edition. Excerpt: ...strength. If such a test could be developed it would of course be of the greatest commercial importance. Treatments Affecting Fatigue Strength. The effect of various heat-treatments on fatigue strength has not been studied systematically, although it is known that such treatments have an important influence. Overheating, which tends to make material brittle, seems always greatly to decrease the fatigue strength. Such overheated material may often be restored by proper reheating. Annealing, in general seems to reduce the fatigue strength somewhat. The results on overstrained material are somewhat contradictory, some tests seeming to indicate increased fatigue strength, and others that tensile overstrain decreases fatigue strength while compressive overstrain increases the strength. The sorbitic structure in steels seems to be most effective in resisting fatigue, while the martensitic structure is weak. Material which has been subjected to repeated stresses apparently does not have its life increased by annealing or by rest. In normal carbon steels the fatigue strength seems to increase with increase of carbon up to about 0.9 per cent carbon. The effect of nickel, chromium, vanadium, etc., upon fatigue properties has not been studied systematically, although apparently these alloys improve the material. Localized Stress and Its Importance. One outstanding feature of fatigue phenomena in metals is the importance of small localized stresses. JProc. Royal Society, 1914. Vol. A, 90, p. 411. Because their derivation depends on mathematical processes it is easy to come to regard the ordinary formulas for computing stresses in machine and structural parts as exact; but, as a matter of fact, such formulas give results representing general conditions of...
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Product details

  • Paperback | 582 pages
  • 189 x 246 x 30mm | 1,025g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236584600
  • 9781236584601