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Date of download: 6/2/2016 Copyright © ASME. All rights reserved. From: Slow Crack Growth of a Pyroceram Glass Ceramic Under Static Fatigue Loading—Commonality.

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Presentation on theme: "Date of download: 6/2/2016 Copyright © ASME. All rights reserved. From: Slow Crack Growth of a Pyroceram Glass Ceramic Under Static Fatigue Loading—Commonality."— Presentation transcript:

1 Date of download: 6/2/2016 Copyright © ASME. All rights reserved. From: Slow Crack Growth of a Pyroceram Glass Ceramic Under Static Fatigue Loading—Commonality of Slow Crack Growth in Advanced Ceramics J. Eng. Gas Turbines Power. 2014;137(3):032505-032505-7. doi:10.1115/1.4028393 (a) Typical fracture surface of a Pyroceram TM test specimen in static fatigue and (b) EDS showing a chemical composition of the area indicated (as a circle) Figure Legend:

2 Date of download: 6/2/2016 Copyright © ASME. All rights reserved. From: Slow Crack Growth of a Pyroceram Glass Ceramic Under Static Fatigue Loading—Commonality of Slow Crack Growth in Advanced Ceramics J. Eng. Gas Turbines Power. 2014;137(3):032505-032505-7. doi:10.1115/1.4028393 Optical microscopy of fracture surface of a Pyroceram TM test specimen showing the fortified layer and fracture feature [7]. The arrow indicates a failure origin. Dye penetrant was used to reveal the fortified layer. The tension side is on the top. Figure Legend:

3 Date of download: 6/2/2016 Copyright © ASME. All rights reserved. From: Slow Crack Growth of a Pyroceram Glass Ceramic Under Static Fatigue Loading—Commonality of Slow Crack Growth in Advanced Ceramics J. Eng. Gas Turbines Power. 2014;137(3):032505-032505-7. doi:10.1115/1.4028393 Scanning electron microscopy of fracture surfaces of Pyroceram TM test specimens subjected to static fatigue at ambient- temperature in distilled water showing the regions of SCG and fracture origins as well: (a) test specimen subjected to the lowest applied stress of 120 MPa (life = 88 h) and (b) test specimen subjected to the highest applied stress of 170 MPa (life = 116 s) Figure Legend:

4 Date of download: 6/2/2016 Copyright © ASME. All rights reserved. From: Slow Crack Growth of a Pyroceram Glass Ceramic Under Static Fatigue Loading—Commonality of Slow Crack Growth in Advanced Ceramics J. Eng. Gas Turbines Power. 2014;137(3):032505-032505-7. doi:10.1115/1.4028393 Results of static fatigue testing for Pyroceram TM glass–ceramic material conducted at ambient temperature in distilled water. The solid line represents the best-fit based on Eq. (4). Note that 20–23 test specimens were used at each of the four applied stresses. Figure Legend:

5 Date of download: 6/2/2016 Copyright © ASME. All rights reserved. From: Slow Crack Growth of a Pyroceram Glass Ceramic Under Static Fatigue Loading—Commonality of Slow Crack Growth in Advanced Ceramics J. Eng. Gas Turbines Power. 2014;137(3):032505-032505-7. doi:10.1115/1.4028393 Weibull distributions of time to failure data in static fatigue of Pyroceram™ glass–ceramic material at ambient temperature in distilled water. The lines represent the best-fit based on a two-parameter Weibull scheme, Eq. (5). Figure Legend:

6 Date of download: 6/2/2016 Copyright © ASME. All rights reserved. From: Slow Crack Growth of a Pyroceram Glass Ceramic Under Static Fatigue Loading—Commonality of Slow Crack Growth in Advanced Ceramics J. Eng. Gas Turbines Power. 2014;137(3):032505-032505-7. doi:10.1115/1.4028393 Prediction of Weibull time-to-failure distributions based on a relation of Eq. (8) for Pyroceram™ glass–ceramic material subjected to static fatigue at ambient temperature in distilled water. The best-fit lines are also included for comparison. Figure Legend:

7 Date of download: 6/2/2016 Copyright © ASME. All rights reserved. From: Slow Crack Growth of a Pyroceram Glass Ceramic Under Static Fatigue Loading—Commonality of Slow Crack Growth in Advanced Ceramics J. Eng. Gas Turbines Power. 2014;137(3):032505-032505-7. doi:10.1115/1.4028393 Results of dynamic fatigue for Pyroceram™ glass–ceramic material at ambient temperature in distilled water. The number of test specimens per test (stress) rate was 30. The inert strength was included for comparison. The line represents the best-fit based on Eq. (10). Figure Legend:

8 Date of download: 6/2/2016 Copyright © ASME. All rights reserved. From: Slow Crack Growth of a Pyroceram Glass Ceramic Under Static Fatigue Loading—Commonality of Slow Crack Growth in Advanced Ceramics J. Eng. Gas Turbines Power. 2014;137(3):032505-032505-7. doi:10.1115/1.4028393 Result of life prediction based on the dynamic fatigue data based on Eq. (13) for Pyroceram™ glass–ceramic material at ambient temperature in distilled water, showing an excellent agreement with static fatigue data Figure Legend:

9 Date of download: 6/2/2016 Copyright © ASME. All rights reserved. From: Slow Crack Growth of a Pyroceram Glass Ceramic Under Static Fatigue Loading—Commonality of Slow Crack Growth in Advanced Ceramics J. Eng. Gas Turbines Power. 2014;137(3):032505-032505-7. doi:10.1115/1.4028393 Results of life prediction in static fatigue (b) from the dynamic fatigue data (a) on advanced monolithic ceramics tested in flexure at elevated temperatures. The prediction from the dynamic fatigue data [1,20] is compared with the static fatigue data of alumina [2], NCX34 silicon nitrides [2], NC203 silicon carbide [2], and NC132 silicon nitrides [19]. Figure Legend:

10 Date of download: 6/2/2016 Copyright © ASME. All rights reserved. From: Slow Crack Growth of a Pyroceram Glass Ceramic Under Static Fatigue Loading—Commonality of Slow Crack Growth in Advanced Ceramics J. Eng. Gas Turbines Power. 2014;137(3):032505-032505-7. doi:10.1115/1.4028393 Results of life prediction in static fatigue (b) from the dynamic fatigue data (a) on various CMCs tested in tension at elevated temperatures. The prediction from the dynamic fatigue data [8,9] is compared with the static fatigue data of SiC/CAS [8], SiC/MAS [8], SiC/SiC [8], and SiC/BSAS [9]. Figure Legend:


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