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Solid Rocket Booster Foam Failure From Stiffener Ring Application
The foam bond coat was severely weakened by two modes of failure: cohesive failure was observed next to the SRB substrate due to severely deformed foam cells of the bond coat and adhesive failure located next to the RT-455 Epoxy. The morphology of the fracture surface indicated that the bond coat was not cured before other forces were applied, primarily the expansion of the second coat distorting the bonding cells. Therefore, contributing causes to the failure were inadequate cure time of the bond coat and SRB substrate core temperature. This method is applicable to SRB, External tank and Atlas V foam de-bonding.
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