seed = 1 material elastic [ name = outside rho = 2.7e-9 # density E = 10. # young's modulus nu = 0. # poisson's ratio ] material elastic [ name = inside rho = 2.7e-9 # density E = 10. # young's modulus nu = 0. # poisson's ratio ] material igfem_elastic [ name = igfem_elastic name_sub_mat_1 = inside name_sub_mat_2 = outside ]