  Peridynamics (PD), as a nonlocal theory, is well-suited for solving problems
with discontinuities, such as cracks. However, the nonlocal effect of
peridynamics makes it computationally expensive for dynamic fracture problems
in large-scale engineering applications. As an alternative, this study proposes
a multi-time-step (MTS) coupling model of PD and classical continuum mechanics
(CCM) based on the Arlequin framework. Peridynamics is applied to the fracture
domain of the structure, while continuum mechanics is applied to the rest of
the structure. The MTS method enables the peridynamic model to be solved at a
small time step and the continuum mechanical model is solved at a larger time
step. Consequently, higher computational efficiency is achieved for the
fracture domain of the structure while ensuring computational accuracy, and
this coupling method can be easily applied to large-scale engineering fracture
problems.
