Cantilever Rotating-Bending Fatigue Tests on Zinc Single Crystals and Polycrystals

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  • 亜鉛単結晶および多結晶の片持廻転曲げ疲労試験
  • アエンタンケッショウ オヨビ タケッショウ ノ カタモチ カイテン マゲ ヒロウ シケン

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The fatigue properties have been studied at room temperature, using a cantilever rotating-bending machine, on zinc single crystals with [0001], [10\={1}0] and [11\={2}0] orientations and on zinc polycrystals having the grain size of 130∼310 grains/cm2. The S-N curve representing the relation between the maximum alternating bending stress and the logarithm of the number of cycles to fracture is linear for single crystals as well as for polycrystals,but its slope is the greatest for polycrystals and becomes less in the order of [11\={2}0]≅[10\={1}0] and [0001] single crystals. Particularly, the S-N curve for [0001] crystals lies nearly parallel to the abscissa, showing that the fatigue failure occurs in a very narrow stress range, above which they cleavage-fracture along the (0001) plane immediately after the load was applied. This supports the idea that brittle crystals show little fatigue. The fatigue strengths of [11\={2}0] and [10\={1}0] crystals are nearly the same and that of polycrystals is independent of the grain size in the range of 130∼310 grains/cm2. The endurance limit, as defined conveniently as the fracture stress at 107 cycles, is 2.0 kg/mm2 for polycrystals, 1.3 kg/mm2 for [11\={2}0] and [10\={1}0] crystals, and 1.1 kg/mm2 for [0001] crystals.

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