Abstract: In order to study the dynamic mechanical properties of multidimensional marble,theoretical analysis,numerical simulation and laboratory experiments were used to analyze the influence of size on the dynamic mechanical properties of marble based on SHPB test.Through laboratory tests and numerical simulation,the rationality of using HJC constitutive model in LSDYNA to study the failure process and stress waveform characteristics of marble under impact load is verified.The lSDYNA software is used to study marble with three different diameers of the same aspect ratio under four different impact velocities.The results show that the dynamic strength of marble decreases with the increase of its diameter and increases with the increase of impact velocity.In the impact compression test,the main failure of marble is axial split tensile failure,and the failure time lags behind the stress peak,which decreases with the increase of impact velocity.The results of laboratory tests and numerical simulation show that the size of marble has an important effect on the dynamic strength of marble in SHPB test when the diameter of pressure bar is constant,and the dynamic strength of marble increases first and then decreases with the increase of its aspect ratio.

Key words: marble,dynamic mechanical parameters,impact test,HJC constitutive model