Propellant creep constitutive construction and finite element application method considering damage softening

The embodiment of the invention discloses a propellant creep constitutive construction and finite element application method considering damage softening, and the method comprises the steps: obtaining creep experiment data of a to-be-measured propellant under the action of a static load, the creep experiment data comprising propellant loading stress, loading time and damage data; determining a damage parameter and a creep compliance parameter of the to-be-measured propellant based on the creep experiment data, and determining a damage evolution function of the to-be-measured propellant according to an accumulated damage theory and the creep experiment data; determining a softening function of the propellant to be measured according to the damage parameter and the creep compliance parameter; and based on the damage parameter, the creep compliance parameter, the damage evolution function and the softening function, constructing a solid propellant creep constitutive model considering the damage softening effect