Fracture toughness of the rigid, low-density, closed-cell, polyurethane, foam used for insulation on the Space Shuttle External Tank is investigated. Data were obtained by loading double-edge-notched specimens in tension. To account for the anisotropic nature of the foam, two types, of specimens were tested so as to represent fracture properties along two different material directions. Additionally, for each type of specimen, two different notch sizes were tested.

1.
Columbia Shuttle Accident Investigation Board, Report Volume 1, August 2003, URL: http://caib.nasa.gov/news/report/volume1/default.html [cited 6 June 2006].
2.
Gibson L. J., and Ashby M. F., 1988, “Cellular solids, structure and properties,” Cambridge University Press, Cambridge United Kingdom, pp. 175-282.
3.
Huber
T.
, and
Gibson
L. J.
,
1988
, “
Anisotropy of foam
,”
Journal of Materials Science
,
23
, pp.
3031
3040
.
4.
Doug Wells, EM-20, Materials, Processes and manufacturing Department, NASA Marshall Space Flight Center, Huntsville, Alabama.
5.
Tada H., 1973, “The stress analysis of cracks handbook,” Del Research Corporation, Hellertown, Pennsylvania.
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