Abstract: Closed-cell aluminum foam has been widely used in automobile industry because of its advantages such as light weight, strong specific strength and specific stiffness, good impact resistance and energy absorption. However, the geometric modeling of aluminum foam for simulation calculation is still insufficient. The widely used Voronoi model cannot simulate the circular cell structure inside the aluminum foam. Based on the traditional Voronoi model, a two-dimensional Bezier curve optimized model with periodic boundary is established. By introducing the concept of filling degree, the unitary power function of porosity with respect to filling degree is established. A two-dimensional aluminum foam geometrical optimized model with specified porosity of 71%～93% can be generated. The optimized model can simulate the real internal structure of aluminum foam. The uniaxial compression simulation experiment of aluminum foam is carried out. Compared with the traditional Voronoi model, the optimized model has better consistency with the experiment. The evolution of random shear bands in the simulation of the optimized model is analyzed, and the accuracy of the optimized model is verified from the perspective of mesoscopic deformation. The proposal of the Bezier curve optimized model provides a theoretical basis for the study of highly simulative geometric modeling of aluminum foam.

Key words: aluminum foam, porosity, Bezier curve, filling degree, mesoscopic deformation