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Application of a closure model to predict crack growth in three engine disc materials

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Abstract

This paper describes the crack-growth predictions made in an AGARD Structures and Materials Panel, Engine Disc Cooperative Programme [1, 2] using the life-prediction code FASTRAN II. The objective of the program was to compare various methods of modeling crack-growth behavior in engine disc materials. The experimental database included three titanium alloys (Ti-6A1-4V, IMI-685 and Ti-17) and two crack configurations (compact and corner-crack tension). Crack-growth-rate data were provided under constant-amplitude loading (R=0.1 and 0.7) and under a repeated spike overload sequence. Participants were to use these data and mechanical properties of the materials to determine the crack-growth-rate properties to be used in their analysis method. The crack-growth properties were then used to predict the number of cycles required to grow a crack from an initial size to a final size under three simple variable-amplitude load sequences and under four complex Turbistan sequences. Predicted results from FASTRAN II agreed well with the test data with an overall mean of 1.01 and standard deviation of 0.31 for all materials and loading conditions.

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References

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Authors and Affiliations

  1. NASA Langley Research Center, 2368, Hampton, Virginia, USA

    J. C. Newman Jr.

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  1. J. C. Newman Jr.
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Newman, J.C. Application of a closure model to predict crack growth in three engine disc materials. Int J Fract 80, 193–218 (1996). https://doi.org/10.1007/BF00012669

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