关键词: 轻量化设计, 多孔结构, 各向异性, 梯度, 维诺图

Abstract: To enhance the design freedom of the porous parts and elevate the matching rate between their interior mechanical property gradient and stress distribution,a stress driven 2.5D graded anisotropic Voronoi porous part design method was proposed.The Finite Element Analysis (FEA) result of the part was divided into a stress scalar field and a stress direction field.The stress scalar field was mapped into the distribution of the Voronoi sites in the part design domain through a proposed weighted random sampling method,making the materials and mechanical properties graded inside the part.After the stress direction field was transformed to a 2D Riemannian manifold,an anisotropic Voronoi diagram was established whose Voronoi cells were distributed along the Riemannian manifold through a proposed anisotropic Voronoi diagram modeling method with a preferred growth direction strategy.Based on the Voronoi diagram,the smooth graded anisotropic Voronoi porous part could be generated through offsetting,harmonic distance field and stretching algorithms in sequence.The mechanical properties of the Voronoi porous part was compared with two other types of porous parts through FEA method,three points bending tests and tensile tests,the results showed that the proposed method could enhance the matching rate between their interior mechanical property gradient and stress distribution,and reduce the material consumption of the part effectively.

Key words: lightweight design, porous structure, anisotropic, graded, Voronoi diagram