Accelerated Aging and Structural Integrity Analysis Approach to Predict the Service Life of Solid Rocket Motors

摘要

The variation of the maximum elongation and initial modulus of propellant during the aging process had been investigated by accelerated aging test with the purpose of getting the service life of the solid rocket motors. The correlation between relaxation modulus and initial modulus was constructed and an empirical model of relaxation modulus as a function of age time was developed. The pattern of equivalent strain of the grain at low temperature launch was obtained using three-dimension viscoelastic finite element method. Compared maximum elongation of propellant with equivalent strain of the grain in different aging time, the service life of the solid rocket motors can be determined by the assessment criteria of structural integrity. Above analytical method and results may be helpful in designing or utilizing the solid rocket motors.