Chapter 50. Modeling Strength Degradation of Hypervelocity Impacted Windows for the Space Shuttle

  1. J. P. Singh
  1. G.-Q. Zhu,
  2. J. E. Ritter and
  3. K. Jakus

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294437.ch50

Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 18, Issue 3

Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 18, Issue 3

How to Cite

Zhu, G.-Q., Ritter, J. E. and Jakus, K. (1997) Modeling Strength Degradation of Hypervelocity Impacted Windows for the Space Shuttle, in Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 18, Issue 3 (ed J. P. Singh), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294437.ch50

Author Information

  1. Department of Mechanical and Industrial Engineering, University of Massachusetts, Amherst, MA 01003

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1997

ISBN Information

Print ISBN: 9780470375495

Online ISBN: 9780470294437

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Keywords:

  • shallow surface pits;
  • hypervelocity;
  • spherical cap;
  • stress intensity;
  • probabilistic strength

Summary

The shallow surface pits created by hypervelocity impact damage on fused silica windows were modeled as a spherical cap surrounded by a circumferential crack to develop a probabilistic model between pit measurements and residual strength predictions. Using finite element analysis, the stress concentration of a spherical cap was determined as a function of the radius and depth of the cap. This stress concentration was then taken into account in developing the appropriate stress intensity factor for this idealized pit-crack geometry. By accounting for fatigue crack growth, the pit-crack model was then used to analyze fatigue strength data of hypervelocity impact-damaged windows to obtain the initial, effective circumferential crack size and the corresponding strength of the windows. The use of this pit-crack model in formulating a probabilistic strength prediction scheme for the windows of the Space Shuttle is discussed.