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TECHNICAL PAPERS: Gas Turbines: Ceramics

Slow Crack Growth Analysis of Advanced Structural Ceramics Under Combined Loading Conditions: Damage Assessment in Life Prediction Testing

[+] Author and Article Information
S. R. Choi

Ohio Aerospace Institute, Cleveland, Ohio 44142e-mail: Sung.R.Choi@grc.nasa.gov

J. P. Gyekenyesi

NASA Glenn Research Center, Cleveland, Ohio 44135e-mail: John.P.Gyekenyesi@grc.nasa.gov

J. Eng. Gas Turbines Power 123(2), 277-287 (Oct 01, 2000) (11 pages) doi:10.1115/1.1365160 History: Received October 01, 1999; Revised October 01, 2000
Copyright © 2001 by ASME
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References

Figures

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Schematics of three loading histories considered: (a) Case I loading, (b) Case II loading, and (c) Case III loading
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Numerical results of normalized strength (σf*) as a function of percent of interruption time (φ) for different values of slow crack growth (SCG) parameter n in Case I loading
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Numerical results of normalized strength (σf*) as a function of percent of interruption time (φ) for different values of slow crack growth (SCG) parameter n in Case II loading
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Numerical results of normalized strength (σf*) as a function of percent of interruption time (φ) for different values of slow crack growth (SCG) parameter n in Case III loading
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Numerical results of normalized crack size (C*) as a function of time (J) for different values of interruption time (φ) in three loading histories: [A] for SCG parameter n=10; [B] for SCG parameter n=20
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Experimental results of flexural strength as a function of percent of interruption time (φ) for Case I loading tests, determined from 96 wt percent alumina, NC132, and AS800 silicon nitrides, and Hexoloy silicon carbide at elevated temperatures. Each solid line represents the mean strength at φ=0.
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Experimental results of constant stress (“static fatigue”) testing for 96 wt percent alumina at 1000°C. A prediction made from the constant stress-rate (“dynamic fatigue”) testing data (6) was included as a dotted line.
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Experimental results of flexure strength as a function of percent of interruption time (φ) for Case II loading tests, determined from 96 wt percent alumina at 1000°C. Two different constant stresses of 50 and 65 MPa were employed. The solid line represents the mean strength at φ=0.
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Comparison of experimental data with numerical solutions (“theoretical”) in Case I loading: (a) 96 wt percent alumina, (b) NC132 silicon nitride, (c) AS800 silicon nitride, and (d) Hexoloy silicon carbide. Error bars represents ±1.0 standard deviation, normalized with respect to a mean strength at φ=0.
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Comparison of experimental data with numerical solutions (“theoretical”) in Case II loading tests for 96 wt percent alumina at 1000°C. Each data point with “triangle” symbol represents an overall mean strength value (normalized). The data points with triangle’s symbols (inner cross-marked) represent the lower-end strength values (normalized) from the data in Fig. 8. Error bars were omitted from plots for clarity.

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