Peak Strain in Regressing Finocyl Port Propellant Grains under Pressure Loading

摘要

Finite element analysis (FEM) has been conducted for case-bonded finocyl port propellant cross section under pressure loading conditions during burning. Peak strain is found to decrease in course of burning, hence, analysis of any intermediate configuration in course of burning is not required for assessing margin of safety in finocyl port propellant grains. The Power Law proposed has also been used to predict peak strain. Variation in strains obtained by FEM and using the Power Law is found to be matching closely with findings reported in CPIA (Chemical Propulsion Information Agency) publications. Extension in domain of power law to regressing pressurised finocyl port propellant grain eliminates dependence on time-consuming computer-intensive FEM computations without compromising the accuracy of results.