Currently

numerical simulation is one of the main means to study the dynamic mechanical properties of concrete.A two-dimensional polygonal distribution program of coarse aggregate was designed to simulate the dynamic response of 74 mm-diameter and 70 mm-height concrete specimen under different impact speeds by means of ANSYS/LS-DYNA software.The influences of impact speed

maximum value of particle size

minimum value of particle size and distribution of polygonal coarse aggregate and volume fraction of polygonal coarse aggregate on the dynamic mechanical properties of concrete were analyzed.At the same time

the dynamic failure mode of polygonal coarse aggregate concrete was discussed.Simulated results show that concrete is ratedependent.With the increase of minimum value of particle size of polygonal coarse aggregate

the peak stress of concrete declines.Whereas

with the increase of maximum value of particle size of coarse aggregate

the peak stress of concrete increases firstly

then declines.When the volume fraction of coarse aggregate is less than 40%

the peak stress of concrete increases with the volume fraction of coarse aggregate.Whereas

when the volume fraction of coarse aggregate is more than 40%

the peak stress of concrete declines with the volume fraction of coarse aggregate.