In order to study motion morphology and stress change of propellant bed under quasi-static compression

electronic universal testing machine is used to implement a quasi-static compression test for propellant beds of cartridge 41 mm and 51 mm of caliber

compression process of 41 mm caliber cartridge is imaged by video recorder. The compression record shows that the compression process can be divided into three steps

they are porosity

compaction and densification; according to test datas

the compression modulus of two propellant bed is solved as 103. 59 MPa and 144. 13 MPa; stress of 51 mm propellant beds is larger than the 41 mm caliber propellant beds with same gap rate; at last the curve of stress change with gap rate of two propellant beds is fitted.