14. Modeling of Deformation and Damage Evolution of CMC With Strongly Anisotropic Properties

  1. Edgar Lara-Curzio
  1. Dietmar Koch,
  2. Kamen Tushtev,
  3. Meinhard Kuntz,
  4. Ralf Knoche,
  5. Juergen Horvath and
  6. Georg Grathwohl

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291221.ch14

Mechanical Properties and Performance of Engineering Ceramics and Composites: Ceramic Engineering and Science Proceedings, Volume 26, Number 2

Mechanical Properties and Performance of Engineering Ceramics and Composites: Ceramic Engineering and Science Proceedings, Volume 26, Number 2

How to Cite

Koch, D., Tushtev, K., Kuntz, M., Knoche, R., Horvath, J. and Grathwohl, G. (2005) Modeling of Deformation and Damage Evolution of CMC With Strongly Anisotropic Properties, in Mechanical Properties and Performance of Engineering Ceramics and Composites: Ceramic Engineering and Science Proceedings, Volume 26, Number 2 (ed E. Lara-Curzio), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291221.ch14

Author Information

  1. University of Bremen, Ceramic Materials and Components, IW3 / Am Biologischen Garten 2, D-28359 Bremen, Germany

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2005

ISBN Information

Print ISBN: 9781574982329

Online ISBN: 9780470291221

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Keywords:

  • ceramic matrix composites;
  • damage tolerance;
  • oxide/oxide composites;
  • SGL carbon;
  • pyrolysis

Summary

A new model was elaborated describing the mechanical performance of various advanced ceramic matrix composites with weak matrices as oxide/oxide composites, C/SiC with polymer derived pyrolized matrix, or C/C. The model is based on the different response of the composites in dependence on the angle between the load direction and the fiber orientation. If loaded in fiber orientation the weak matrix composites show an almost linear elastic behavior but in off-axis loading the composites behave strongly inelastic. Experimental results from tensile, shear, and mixed mode loading tests as well as from experiments with notched specimens (DEN) are used as basis for the model which is implemented in a finite element code. In addition, the damaging and failure mechanisms are investigated by acoustic emission analysis and by evaluation of loading-unloading cycles. The model allows then the prediction of the elastic/inelastic stress-strain behavior and the strength under complex loading conditions which helps to optimize the design of components with complex shape and variable fiber orientation.