Research on the Dynamic Damage Properties and Determination of the Holmquist–Johnson–Cook Model Parameters for Sandstone

During blasting in engineering construction, the surrounding rock becomes unstable and is damaged under impacts of multiple low-amplitude stress waves. It great practical significance to understand damage evolution characteristics attenuation mechanical properties rocks subjected Single impact repeated tests for sandstone were carried out using a split Hopkinson pressure bar (SHPB) loading system. The single test results showed that materials strain-rate-dependent, dynamic constitutive curve could be divided into four stages, namely linear elastic stage, new crack formation plastic strengthening stage unloading stage. failure pattern mostly indicated splitting tensile failure, threshold was 45 J. relationship between wave amplitude D = 0.0029·exp\({\boxed{f_{()}}}\)(5.4127•?/76.13) ? 0.0504. compressive strength modulus decreased, while strain increased gradually as number (n) increased. specimen had only one fracture surface compared with pattern. cumulative presented development form ‘rapid rise–steady development–rapid rise’, law expressed by 0.265 0.328·ln???\({\boxed{f_{()}}}\)(ln13.989/n). Finally, set methods determine Holmquist–Johnson–Cook (HJC) model parameters proposed based on test, uniaxial compression triaxial test. numerical simulation SHPB curves good agreement experimental results.