Predicted formula of the dynamic increase factor of PBX 9501

To quantify the effect of strain rate effect on the mechanical properties of PBX, the concept of dynamic increase factor was introduced. The compression strength and tensile strength data of PBX 9501 used as the object of study under different temperatures and different strain rates were summed up. Parts of experimental data were converted to those at room temperature by the WLF time-temperature superposition principle to supplement the lacked strain strength data. The prediction formulas of dynamic increase factor of compressive strength and tensile strength of PBX 9501 were fitted based on the test data, respectively. Results show that with the change of strain rate, the compression strength and tensile strength of PBX 9501 reveal a bilinear growth trend in the log-log coordinate, but the trend of change in the compression strength and tensile strength of PBX 9501 is different. At the given range of strain rate, the maximum change value of dynamic increase factor of compression is beyond 40, while the maximum change value of dynamic increase factor of tension is less than 10. With these empirical formulas, the strength variation of PBX 9501 at different strain rates can be predicted, which is convenient for engineering application.