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FEM-LIFTAP, A Finite Element Lifetime Analysis Postprocessor for Ceramic Components

  • K. Kussmaul
  • S. Lauf
  • K. Turan
Chapter

Abstract

In recent years, several failure probability postprocessing programs for FE-codes applied to ceramic components have been developed. All postprocessors combine the statistical strength description according to Weibull with different strength theories as for example the ‘Principal Stress Theory’ linked to the ‘Principle of Independent Action’ or the ‘Linear Elastic Fracture Mechanics’ approach, both accounting for multiaxialloading. Moreover, the program includes a ‘Lifetime Processor’ which allows the calculation of the time-dependent failure probability of the ceramic component if strength degradation occurs due to subcritical crack growth. In a typical example, the time-dependent failure probability of an automotive ceramic exhaust valve was calculated using the mean value of the positive principal stresses as strength criterion.

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References

  1. 1.
    Bowman, K.J, Reyes-Morel, P.E and Chen, I-W, Reversible transformation plasticity in uniaxial tension-compression cycling of Mg-PSZ. Mat. Res. Soc. Symp. Proc.,1987, 78,51–57.CrossRefGoogle Scholar
  2. 2.
    Grathwohl, G, Ermüdung von Keramik unter Schwingbeanspruchung, Mat.-wiss. u. Werkstofftech., 1988, 19, 113–124.CrossRefGoogle Scholar
  3. 3.
    Ritchie, R.O and Dauskardt, R.M, Cyclic fatigue of ceramics: A fracture mechanics approach to sub critical crack growth and life prediction, to be published in J. Ceram. Soc. Jap., 1991, 99.Google Scholar
  4. 4.
    Tradinik, W, Kromp, K and Pabst, R.F, A combination of statistic and sub critical crack extension,Mat. Sc. Eng., 1982, 56, 39–46.CrossRefGoogle Scholar
  5. 5.
    Davidge, R.W, McLaren, J.R and Tappin, G, Strength-probability-time (SPT) relationships in ceramics, J. Mater. Sci., 1973,8’ 1699–05.CrossRefGoogle Scholar
  6. 6.
    Lauf, S, Pabst, R.F, Strength-probability-time diagrams and the strength function — A critical examination. In Ceramic Materials and Components for Engines, eds. W. Bunk, H. Hausner, DKG, Bad Honnef, 1986, 961–977.Google Scholar
  7. 7.
    Stanley, P, Fessler, H and Sivill, A.D, An engineer’s Approach to the prediction of failure probability of brittle components. In Proc. Brit. Ceram. Soc., ed. D.J. Godfrey, BCS, Stoke-on-Trent, 1973, 22, 453–487.Google Scholar
  8. 8.
    Evans, A.G, A general approach for the statistical analysis of multiaxial fracture, J. Am. Ceram. Soc., 1978, 61, 302–308.CrossRefGoogle Scholar
  9. 9.
    Rossmanith, H.P, Grundlagen der Bruchmechanik, Wien, 1982.CrossRefGoogle Scholar
  10. 10.
    Ikeda, K, Igaki, H and Kuroda T, Fracture strength of alumina under uniaxial and triaxial stress states, Am. Ceram. Soc. Bull., 1986, 65, 683–88.Google Scholar
  11. 11.
    Jayatilaka, A. de S., Fracture of Engineering Brittle Materials, Appl. Sc. Publ., London, 1979.Google Scholar
  12. 12.
    Creyke, W.E.C, Sainsbury, I.E.J and Morell, R, Design with Non-ductile Materials, Appl. Sc. Publ., London-New York, 1982.Google Scholar
  13. 13.
    Lamon, J., Ceramic Reliability: Statistical analysis of multiaxial failure using the Weibull approach and the Multiaxial elemental strength model, J. Am. Ceram. Soc., 1990, 73, 2204–12.CrossRefGoogle Scholar
  14. 14.
    Nemeth, N.N, Manderscheid, J.M and Gyekenyesi, J.P, Ceramic analysis and reliability evaluation of structures (CARES), NASA Technical Paper 2916, 1990.Google Scholar
  15. 15.
    Magerl, F, unpublished, University of Stuttgart, 1989.Google Scholar
  16. 16.
    Nemeth, N.N, Manderscheid, J.M and Gyekenyesi, J.P, Design of ceramic components with the NASA/CARES computer programm, NASA Techn. Mem. 102369,1990.Google Scholar

Copyright information

© Elsevier Science Publishers Ltd and MPA Stuttgart 1992

Authors and Affiliations

  • K. Kussmaul
    • 1
  • S. Lauf
    • 1
  • K. Turan
    • 1
  1. 1.Staatliche Materialpruefungsanstalt (MPA)University of StuttgartStuttgart 80Germany

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