The invention belongs to the field of material science, and discloses a method for constructing a double-connected three-dimensional
microstructure data set with the same boundary, which comprises the following steps of: firstly, determining a boundary type and reconstructing a
microstructure by taking the boundary type as a constraint of six surfaces of a cube; then, a related optimization target is selected for each boundary type, and an initial
data set is created under corresponding constraint conditions; thirdly, carrying out
structure generation by adopting a generative AI to expand an attribute space of the
microstructure, and carrying out iterative expansion on a
data set by adopting an active learning strategy; and finally, identifying and retaining a structure with a dual-
connectivity feature through a
connected component marking
algorithm, and removing a non-
connectivity structure, so as to construct a data set with the same boundary and dual
connectivity, and through the LBBM data set constructed by the method, the calculation efficiency of multi-scale
assembly is remarkably improved, and the accuracy of the multi-scale
assembly is improved. The boundary connectivity between the microstructures and the double connectivity of the whole multi-
scale structure are ensured, the material constructed based on the data set has printing and manufacturing friendliness, and the functions of fluid flowing, heat conduction, filtering,
gas exchange and the like can be achieved.