THE USE OF THE CRITICAL THICKNESS CONCEPT IN DESIGN
ARMY MATERIALS RESEARCH AGENCY WATERTOWN MA
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A brief review of the critical thickness concept is presented. Three actual examples of solid rocket motor case designs are then discussed. In the first example, fracture toughness andor critical thickness were not taken into account, but the case proved adequate. In the second example, a design based on the success of the first case proved inadequate because of an increase in section thickness. In the third example, the critical thickness was properly considered and no brittle failure problem arose. After the discussion of these histories, a simplified technique for obtaining the critical thickness data required for adequate design is presented.