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Correlations between fracture surface appearance and fracture mechanics parameters for stage II fatigue crack propagation in TÏ-6AI-4V

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Abstract

Stage fatigue crack propagation in Ti-6A1-4V has been studied as a function of various fracture mechanics parameters, including the stress intensity range (ΔK) and both positive and negative ratios of the minimum to maximum stress (R). It was found that the fracture surface appearance undergoes a transition from cyclic cleavage to striations at a ΔKeff of approximately 13 MNm-3/2 (11.8 ksi√in.). It was also observed that the measured striation spacings are generally within a factor of two of the optically measured crack growth rates. Both of these results can be particularly useful for determining unknown component cyclic loadings during failure analysis. The criterion for the cyclic cleavage to striation transition is considered to be a change from primarily single to multiple slip within the individual grains at the crack tip. This occurs when the cyclic plastic zone size becomes approximately equal to the α grain size.

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Authors and Affiliations

  1. Materials Engineering and Research Laboratory, Pratt and Whitney Aircraft, 06457, Middletown, Conn.

    A. Yuen, S. W. Hopkin, G. R. Leverant & C. A. Rau

Authors
  1. A. Yuen
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  2. S. W. Hopkin
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  3. G. R. Leverant
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  4. C. A. Rau
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Yuen, A., Hopkin, S.W., Leverant, G.R. et al. Correlations between fracture surface appearance and fracture mechanics parameters for stage II fatigue crack propagation in TÏ-6AI-4V. Metall Trans 5, 1833–1842 (1974). https://doi.org/10.1007/BF02644148

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  • DOI: https://doi.org/10.1007/BF02644148

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