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A stepwise analysis of the load-time history of specimen PP-0.5-3-1 and PP-2-3-1 is shown in Fig. 15 (a). Because of the mechanical inertia of the particles, there is a stepwise variation at the beginning of the load-time history for each specimen. Due to the more uniform expansion of the matrix particles, the PP-2-3-1 specimen has a higher loading rate and a smaller elastic strain than the PP-0.5-3-1 specimen. As a result, the crack initiation time of the PP-0.5-3-1 specimen is later than that of the PP-2-3-1 specimen. Moreover, because of the flame-like strain concentration on the right end of the bar, the crack initiation of specimen PP-2-3-1 occurs earlier.
Simultaneously, the stress distribution of the specimens under different loading times is analyzed. In Fig. 16, the area in grey is the surface whose area is greater than 70%, and if this value is greater than 90%, this area is black. If it is less than 70%, it is white.
The influence of loading rate on the dynamic tensile strength of the -0.5 macro-PPF specimen, macro-PPF specimen, and PPFRCC specimen is shown in Fig. 8. It can be seen from the figure that the experimental results are in good agreement with the simulation results; in particular, the dynamic tensile strength is not significantly affected by the loading rate. The maximum slip of the specimen is dependent on the loading rate, which is provided in the following Table. d2c66b5586