Experimental study on rheological properties of highly filled solid propellant simulant

doi:10.19491/j.issn.1001-9278.2022.11.015

Abstract

Abstract:

The rheological properties of a highly filled solid propellant stimulant were studied using capillary and rotational rheometers under the steady shear and dynamic shear conditions. The effects of melt pressure and shear amplitude on the shear viscosity of the solid propellant stimulant were investigated in the temperature ranges of 100~120 ℃ and 50~100 ℃， respectively. The dependency of shear viscosity on the melt pressure was evaluated through a pressure coefficient， correcting the effect of pressure on viscosity. The results indicated that the pressure coefficient was distributed between 4.81 and 9.65 GPa^-1 at a pressure between 12 and 121 MPa. The shear viscosity of the solid propellant stimulant increased as a power⁃law trend， indicating a steady capillary shear. In addition， dynamic shear test results indicated that the viscosity of solid propellant stimulant increased two times when the normal force rose from 15 to 42 N. Furthermore， the effect of shear amplitude on the rheological properties of the highly filled solid propellant stimulant was found to be sensitive. A slip occurred between the sample and plate at a relatively low temperature and large shear amplitude. This should be avoided in practical use.

Key words: polymer, highly filled solid propellant stimulant, rheology, viscosity, pressure

CLC Number:

TQ320.6

LIN Xiang, ZHANG Jun. Experimental study on rheological properties of highly filled solid propellant simulant[J]. China Plastics, 2022, 36(11): 101-107.

Figures/Tables 7

Fig.1. Morphologies of solid propellant simulant after banburying

Fig.2. Triple⁃stage capillary rheometer and an example of step pressure and shear rate⁃time curves for typical melts

Fig.3. Pressure depencence of η of the simulant at different shear rate and temperature

Fig.4. Apparatus and samples of small amplitude oscillation shear meansurement

Fig.5. Relationship between complex shear viscosity and pressure of the simulant at 80 ℃ and amplitude of 0.5 %

Fig.6. Complex shear viscosity of the simulant at amplitude of 0.5 % and 5 %

Fig.7. Effects of temperature and shear amplitude on tanδ of the stimulant

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