Prediction of the Inert Strength Distribution of Si3N4 Diesel Valves

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Censored Weibull strength distributions were generated with NT551 silicon nitride four-point flexure data using the ASTM C1161-B and 5.0 mm diameter cylindrical specimens. Utilizing finite element models and AlliedSignal's life prediction codes, the inert or fast fracture strength failure probability of a ceramic diesel valve was estimated from these data sets. The failure probability prediction derived from each data set were found to be more conservative than valve strength data. Fractographic analysis of the test specimens and valves showed that the cylindrical specimens failed from a different flaw population than the prismatic flexure bars and the valves. The study emphasizes ... continued below

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9 p.

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Andrews, M.J.; Breder, K. & Wereszczak, A.A. January 25, 1999.

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Description

Censored Weibull strength distributions were generated with NT551 silicon nitride four-point flexure data using the ASTM C1161-B and 5.0 mm diameter cylindrical specimens. Utilizing finite element models and AlliedSignal's life prediction codes, the inert or fast fracture strength failure probability of a ceramic diesel valve was estimated from these data sets. The failure probability prediction derived from each data set were found to be more conservative than valve strength data. Fractographic analysis of the test specimens and valves showed that the cylindrical specimens failed from a different flaw population than the prismatic flexure bars and the valves. The study emphasizes the prerequisite of having coincident flaw populations homogeneously distributed in both the test specimen and the ceramic component. Lastly, it suggests that unless material homogeneity exists, that any meaningful life prediction or reliability analysis of a component may not be possible.

Physical Description

9 p.

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OSTI as DE00004594

Medium: P; Size: 9 pages

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  • 23rd Annual Cocoa Beach Conference and Exposition, Cocoa Beach, FL (US), 01/25/1999--01/19/1999

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  • Report No.: ORNL/CP-102035
  • Report No.: EE 04 03 00 0
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 4594
  • Archival Resource Key: ark:/67531/metadc674848

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  • January 25, 1999

Added to The UNT Digital Library

  • July 25, 2015, 2:21 a.m.

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  • April 11, 2017, 9:02 p.m.

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Andrews, M.J.; Breder, K. & Wereszczak, A.A. Prediction of the Inert Strength Distribution of Si3N4 Diesel Valves, article, January 25, 1999; Tennessee. (digital.library.unt.edu/ark:/67531/metadc674848/: accessed October 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.