A DETERMINATION OF DEWETTING IN A BIAXIAL STRESS FIELD.
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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An experimental investigation of dewetting in uniaxial and biaxial stress fields was conducted for infinitesimal strain levels. An optical technique was attempted with limited success, which demonstrated the need for more precise measurements at small strains. A method was developed for stiffening the surface of the propellant test specimen with commercial bonding cement, which facilitated the use of strain gages on the stiffened surface. An analytic expression was derived which relates measurements made on the outer surface of the cement to internal propellant behavior. It was noted that dewetting commenced at strain levels of the order of zero strain, and that there was little variation with stress ratio in the strain at which dewetting commenced. Dewetting appeared to be complete at lower strains for higher stress ratios. Dewetting was noted to be at such low strain values that the phenomenon is considered to be inconsequential in a practical engineering analysis of this propellant. Author
- Solid Rocket Propellants