Probabilistic life design of refractories for steel casting

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The failure probability of magnesia-graphite components was predicted using an established probabilistic life prediction design algorithm. The described algorithm is commonly employed in the design of load-bearing structural ceramics components; however, interest existed for the present study to demonstrate its use and applicability in the design (or failure probability analysis) of arbitrary refractory components. Two components were examined: (1) a 25.4 x 25.4 x 152 mm (1 x 1 by 6 in.) magnesia-graphite prismatic bar subjected to three-point flexure using a 101.6 mm (4 in.) span, and (2) a vertically suspended magnesia-graphite nozzle whose dimensions were 203 O.D. x 101.6 ... continued below

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13 p.

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Wereszczak, A.A.; Smith, J.D. & Moore, R.E. February 1, 1998.

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  • Wereszczak, A.A. Oak Ridge National Lab., TN (United States). High Temperature Materials Lab.
  • Smith, J.D.
  • Moore, R.E. Univ. of Missouri, Rolla, MO (United States). Dept. of Ceramic Engineering

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Description

The failure probability of magnesia-graphite components was predicted using an established probabilistic life prediction design algorithm. The described algorithm is commonly employed in the design of load-bearing structural ceramics components; however, interest existed for the present study to demonstrate its use and applicability in the design (or failure probability analysis) of arbitrary refractory components. Two components were examined: (1) a 25.4 x 25.4 x 152 mm (1 x 1 by 6 in.) magnesia-graphite prismatic bar subjected to three-point flexure using a 101.6 mm (4 in.) span, and (2) a vertically suspended magnesia-graphite nozzle whose dimensions were 203 O.D. x 101.6 I.D. x 1,524 mm length (8 O.D. x 4 I.D. x 60 in. length). Magnesia-graphite strength data were combined with finite element analysis of the components and an appropriate multiaxial ceramic failure criterion to predict the failure probabilities of each. The latter exercise illustrated how laboratory-generated strength distributions may be used to predict the failure probability of a representative refractory component used in steel casting, while the former provided useful information of strength-dependence on size between two commonly used specimen geometries used for refractory strength tests. The results indicated an approach of probabilistic life design is applicable to refractory component design for the steel casting industry.

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13 p.

Notes

OSTI as DE98004933

Source

  • 34. annual symposium on refractories, Rolla, MO (United States), 19-20 Mar 1998

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  • Other: DE98004933
  • Report No.: ORNL/CP--97140
  • Report No.: CONF-980370--
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 650387
  • Archival Resource Key: ark:/67531/metadc709223

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  • February 1, 1998

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • Jan. 20, 2016, 12:10 p.m.

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Wereszczak, A.A.; Smith, J.D. & Moore, R.E. Probabilistic life design of refractories for steel casting, article, February 1, 1998; Tennessee. (digital.library.unt.edu/ark:/67531/metadc709223/: accessed December 10, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.