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EMBEDMENT OF INTERNAL INSTRUMENTATION IN PROPEL LANT GRAINS. WEAPON SYSTEM 133A,
HERCULES POWDER CO MAGNA UTAH
The Gulton Industries Model TA 5201012 triaxial accelerometer was specifically developed for this embedment program, as were the triaxial strain measuring instruments discussed in this report. Their nominal sensitivity, density, and broad frequency response met program requirements. These instruments were successfully embedded within the propellant grain and should provide accurate measurements of accelerations from pre selected points therein. Although these instru ments were developed for use in the embedment program, their usefulness will be realized in advance development of future motors. They will be especially valuable in testing, wherever strain and acceleration within the propellant mass is a prime factor in motor design. Instru ments and cables embedded in propellant grains do not cause cracks of voids during the casting process, nor do cables and instruments enlarge or create cracks in the grain when subjected to vibration environments of less than 10g accel eration. Full-scale motors containing embedded instruments can be fired successfully, as is showny the successful firings of the subscale motors discussed in this report. Calculations from subscale firing data indicate that a 1 per cent drop below the nominal pressures of full scale chambers could be expected. Author
AF04 647 243