To obtain the notch strength and notch sensitivity of double base propellant

uniaxial tensile tests on the double-edge U-notched thin plate specimens and standard specimens were carried out under the strain rate of 10-4s-1 at (20±1)℃.Results show that the stress concentration factor of notched specimens has a significant effect on the notch strength within certain limits. When the stresscon centration factor is less than the notch sensitivity factor (1.99~2.22)

the notch strength of double-edge U-notched thin plate specimans is approximately equal to its fracture strength and independent of the stress concentration factor. This indicates that the double base propellant is insensitive to notch in this case. The uniaxial tensile test results of standard specimens is used to predict the value of the notch strength and notch sensitivity factor of double base propellant

and the predictions are consistent with the test results of the notched specimens proving the validity of this prediction method.