BRAZED AIRFRAME STRUCTURE EVALUATION.
MCDONNELL AIRCRAFT CORP ST LOUIS MO
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This report describes evaluation test results of a brazed airframe section designed for optimum producibility. Strength testing to evaluate the design was performed by the Structural Evaluation Group of the MAC Structures Laboratory. A uniform air pressure was applied to the test section in 2 psi increments. Deflection and set was recorded at each increment of loading. Specimen O sustained a uniform pressure of 30 psi without failure or visible indication of yielding. At approximately 27 psi the root rib of Specimen 1 started buckling and failure of the specimen followed as pressure was increased to 45 psi. Failure of Specimen 2 began at 37 psi as the braze between the corrugation and the spars on the compression side started failing. Complete failure of the specimen occurred at 45 psi. Author