Abstract:According to the varying load in different directions, the anisotropy control of porous materials can significantly enhance the load-bearing efficiency of materials, thus better addressing the need for lightweight designs. In this research, a modified Gibson-Ashby model for strut-based porous materials accounting for geometric parameters was established by taking G7 and bccz types of TC4 porous materials as examples. This model can serve as a guide for the precise control of anisotropy for strut-based porous materials. Based on this model, a series of anisotropic porous materials with similar configurations but distinct properties were created by adjusting geometric parameters of common unit cells. The effects of unit cell geometric parameters on the anisotropic compressive strength and failure modes of porous materials were investigated through vertical and lateral compressive tests, thereby validating the efficacy of the modified model. The results show that the compressive strength of strut-based porous materials is primarily determined by the aspect ratio and the inclination angle of their struts. By fine-tuning the inclination angle of struts, the anisotropic mechanical properties of porous materials can be effectively modulated. Under the same density, increasing the inclination angle of the diagonal struts from 35° to 55° can significantly increase the vertical compressive strength of G7 and bccz types of TC4 porous materials by 105% and 45%, respectively, with only a minor reduction in lateral compressive strength of 16% and 13%, respectively.