温度交变条件下固体推进剂贮存寿命评估

A life evaluation method based on modified Coffin-Manson model was proposed for the solid propellant stored in alternating temperature environments for a long time. Firstly, based on the temperature cycling acceleration degradation test data, the performance degradation curve of a solid propellant at different accelerated stress levels was obtained by the linear regression method. Then, combined with the failure threshold, the pseudo life at different acceleration stress levels was calculated according to the performance degradation model at the corresponding acceleration stress level. Finally, a multiple regression method was used to determine the acceleration model-modified Coffin-Manson model, which can be used to extrapolate the storage life of a solid propellant stored at room temperature. The storage life of a solid propellant is 16.7 years at room temperature by this new method. Compared with the actual storage life, the error is about 7.22%. The result indicates that this method is effective and feasible and can be applied to evaluate the storage life of other solid propellants or ammunition stored in an alternating temperature environment for a long time.