element mass_matrix intpo_depth
mass_matrix= lumped or consistent
intpo_depth= 1 or 2
element lumped 2 element consistent 1
This command sets the element type used in the finite element calculation in the coarse-grained domain.
mass_matrix, the lumped type approximates the mass of each element and distributes it to the nodes; the consistent type distributes the exact mass over the entire element.
intpo_depth decides whether the first nearest neighbor (1NN) or the second nearest neighbor (2NN) elements are employed in the coarse-grained domain; their differences are illustrated in Fig. B26 of Xu et al., 2015.
The atomic mass is provided in the mass command.
element lumped 2