Statistics – Applications
Scientific paper
Jan 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aipc..387..389c&link_type=abstract
Space technology and applications international forum (STAIF - 97). AIP Conference Proceedings, Volume 387, pp. 389-396 (1997).
Statistics
Applications
Scientific paper
An analytical method that considers the temperature-dependent plastic (thermoplastic) material behavior of three-dimensional weave carbon-carbon composites has been developed. Consideration of this behavior is more realistic than the previously assumed temperature-dependent elastic (thermoelastic) material behavior. This method is intended for thermostructural analysis of heat sources in the unlikely event of accidental reentry of the Cassini spacecraft during Earth Gravity Assist maneuvers. The development of the method was prompted by higher anticipated flyby velocities of the Cassini spacecraft than the earlier Galileo spacecraft, with associated higher heat fluxes, temperatures, pressures, and decelerations in the event of inadvertent reentry. The development of the method, its application, and results on representative structures are presented. The method can be applied to axisymmetric structures fabricated of material with Cartesian orientation, as well as parallelepiped shapes, such as are found on heat source structures. The thermoplastic analysis method produces final strain states which are 20% to 220% of the strain states from a corresponding thermoelastic analysis under severe reentry environments. The method converges to the original thermoelastic solution if the loads allow the material to stay within the linear regions of its stress-strain behavior.
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