Development of a Solid Rocket Propellant Nonlinear Viscoelastic Constitutive Theory. Volume I. Text.

摘要

The program was designed to develop three dimensional nonlinear viscoelastic equations that could describe the stress-strain response of solid propellant materials for complex loading conditions. The approach used was to identify and mathematically model the underlying mechanisms contributing to the constitutive nonlinearity in these highly filled polymeric materials and to then include these effects within the framework of a continuum constitutive theory. Also considerable theoretical work was done showing how the resulting mathematical representations could be contained within the framework of a thermodynamic theory and viscoelastic fracture mechanics. During the course of this contract considerable experimental as well as theoretical work were performed since the development of the theory was based on modeling observable effects. The experimental work consisted of determining the three dimensional strain response due to complex stress histories at temperatures from -65F to +150F and superimposed hydrostatic stress-states from 0to 1000psi. (Modified author abstract)