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An Assessment of the C* and KI Parameters for Predicting Creep Crack Growth in a Ni-Base Superalloy (Waspaloy) at 700^C

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Abstract

The results of experimental creep crack growth tests, using compact tension specimens, made from a Ni-base superalloy (Waspaloy) at 700^C are presented. The experimental results indicate that the creep crack growth rate data for the Ni-base superalloy Waspaloy, at 700^C, can be correlated using the C* parameter, calculated from load-line displacement rates. The mode-I stress intensity factor, KI, does not appear to be capable of correlating the data except at high creep crack propagation rates. Analytical solutions indicate that creep crack growth was occurring under transient creep conditions in the experiments. Finite element (FE) simulations were performed in which the experimentally determined crack growth versus time results were imposed. The good agreement between the resulting FE solutions for load-line displacements and corresponding C* values with the experimental results show that the FE simulation was successful. The FE simulation revealed that the creep zone increases as the crack growth and a transient state of creep occurs in the vicinity of the advancing crack tip. An apparent correlation between the crack growth rates and the C* parameter has been shown. This information is helpful in assessing the likely usefulness of the C* and KI parameters for predicting creep crack growth in more general situations.

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Authors
  1. L. Xia
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  2. A.A. Becker
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  3. T.H. Hyde
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Xia, L., Becker, A. & Hyde, T. An Assessment of the C* and KI Parameters for Predicting Creep Crack Growth in a Ni-Base Superalloy (Waspaloy) at 700^C. International Journal of Fracture 92, 39–54 (1998). https://doi.org/10.1023/A:1007415306833

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  • DOI: https://doi.org/10.1023/A:1007415306833

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