DETERMINATION OF EFFECTS OF MATERIALS AND PROCESS VARIABLES ON FILAMENT-WOUND STRUCTURES.
Quarterly progress rept. no. 3, 15 May-15 Aug 64,
AEROJET-GENERAL CORP AZUSA CALIF
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Six additional specimens were fabricated and tested during this report period. Mechanical and physical test data indicated that the values obtained for specific gravity, density, horizontal shear, and modified cylinder shear were the highest to date for specimens fabricated on this program. The calculated void contents were well within the 0.5-vol range suggested by the technical monitor. The ultrasonic-absorption attenuation values, ranging from 4.3 to 6.4 dbin., which were obtained were also within the customers suggested range. The attenuation variation was determined to be less than 1 db along the length of the cylinder the surface reflection losses were determined to be 5.9 db. Microphotographic analysis indicated the structures to be uniform and void free. While the test results described above were excellent, the collapse pressures and the resultant stress levels were lower than expected. The highest value obtained was a pressure of 20,300 psi with a composite stress level at the ID of 112.8 ksi. All test results were below the values previously obtained for the same specimen configuration. These low values are believed to be the result of a combination of high hoop-winding tensions and the use of an internal expansion machining mandrel.