EFFECT OF FILLER CONCENTRATION ON THE VISCOELASTIC RESPONSE OF A COMPOSITE SOLID PROPELLANT,
Abstract
The mechanical properties of filled elastomers, in general, and of composite solid rocket propellants, in particular, are dependent on the volume fraction of filler, the viscoelastic properties of the binder, and the interaction between the binder and filler particles. An investigation was conducted to determine the effect of volume fraction of filler on the viscoelastic response of the PBAA propellant system. Formulations containing up to 84% filler fraction were investigated in uniaxial tension with strain rates varying from 0.05 to 5.0 in. per in. per minute and temperature of +180 F to -90 F. While the maximum stress, modulus, strain-energy-density at failure, and the stressstrain relationship were found to increase with addition of filler particles, a decrease was found in the strain at break. Empirical formulae were derived for the dependence of the filler fraction shift factor and the filler-induced strain concentration factor on filler fraction. Mechanical response spectrums are presented for maximum stress, modulus, strain, strain-energydensity at failure, and for the stress-strain relationship, indicating the dependence of these parameters on strain rate, temperature, and filler fraction. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 02, 1964
- Accession Number
- AD0433612
Entities
People
- Donald L. Martin Jr.
Organizations
- United States Army Aviation and Missile Command