Statistical Fatigue Crack Propagation of a Superalloy Under a Block Type Spectrum Loading at Elevated Temperature

by J. N. Yang, Natl Cheng Kung Univ, Taiwan,
G. C. Salivar, Natl Cheng Kung Univ, Taiwan,
B. J. Schwartz, Natl Cheng Kung Univ, Taiwan,

Document Type: Proceeding Paper

Part of: Structural Safety and Reliability


A lognormal statistical model was developed for the prediction of crack growth damage accumulations of superalloys under a block type spectrum loading at elevated temperature. Both the distribution of crack length at any given service time and the distribution of service time to reach any given crack length were predicted. These theoretical predictions were compared with test data from twelve specimen tests for IN100, a nickel-base superalloy, generated under a block type spectrum. A good correlation was obtained between the predicted distributions and the test results.

Subject Headings: Statistics | Fatigue (material) | Cracking | Thermal loads | Load factors | Temperature effects | Temperature distribution | Load tests

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