Fatigue testing of thin tapes
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Summary and Conclusions
Even though this machine provides one-way bending-fatigue information only, existing relationships (such as Goodman's or Berber's theories3) permit estimating fatigue characteristics for two-way bending.
Comparing the results from tape batches No. 1 and No. 2, it was concluded that the difference in the surface and edge condition, as well as heat treatment and cold working, between specimens are the major causes of the scattering of data. The machine has not been further used consistently on one material or on quantity of samples to produce additional data worthwhile to be presented in the paper.
Specimens made from the cobalt-base spring alloy (batch No. 1) had greater fatigue strength than those from batch No. 2, at higher stress levels.
Cold working (e.g., shot peening) of cobaltbase tapes does not significantly improve the fatigue strength.
KeywordsFatigue Heat Treatment Mechanical Engineer Fluid Dynamics Stress Level
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- 1.Cazaud, R., “Fatigue of Metals,” pp. 61–86, Chapman and Hall (1953).Google Scholar
- 2.Hetenyi, M. ed., “Handbook of Experimental Stress Analysis,” pp. 52–59, John Wiley and Sons (1950).Google Scholar
- 3.Cazaud, R., ibid “Handbook of Experimental Stress Analysis,” pp. 59–61, John Wiley and Sons (1950).Google Scholar