Estimation of Master Curves of Relaxation Modulus and Tensile Properties for Solid Propellant

摘要

The stress relaxation modulus E(t)is one of the most important properties of viscoelastic materials such as solid propellant, and it is used to define the viscoelastic behavior based on the influence of time and temperature. In this paper, stress relaxation tests are conducted under constantstrain 2% for 600 seconds in the range of temperature 60°C to -60°C and tensile tests are performed for solid propellants under constant cross head rate 5 mm/min in the same temperatures as stress relaxation tests. Based on the results, time-temperature shift factors are obtainedby shifting the relaxation modulus curves horizontally and the master curve of relaxation modulus is generated. The master curve of relaxation modulus according to classical method and Williams-Landel-Ferry(WLF) method are discussed. Also, the master curve of tensile properties are drawn using predetermined shift factor and the results are discussed.