A method of non-linear viscoelastic analysis of solid propellant grains for pressure load

An elasto-viscoplastic analysis of direct extrusion of a double base solid propellant

“…The hoop strain has been obtained as 2.49% after a unit time for the nonlinear viscoelastic FEA solution compared to that of 2.72% calculated after 212 substep-converged nonlinear elastic FEA solution. This represents a 9.2% difference between their elastic and viscoelastic hoop strain estimations [2]. Herder et al [3] compared the dynamic mechanical properties of an HTPB-based solid propellant with quasi-static test results under tension, compression, and torsion loadings as well as temperatures ranging from À100°C to 100°C.…”