Geometric Design And Optimization Of Controllable Elasticity Based On Heterogeneous Materials

In recent years,with the rapid development of digital manufacturing technology,especially the emergence of high-precision manufacturing technologies such as DLP(digital light processing,abbreviated as DLP),people can manufacture more complex geometric structures in a smaller scale with single material,so as to obtain the material with different macroscopic physical properties.Materials with different macroscopic properties and constituent properties are called meta-material.At the same time,the joint manufacturing of different material combinations can further eliminate the shortcomings and limitations of traditional single material manufacturing,enable us to manufacture objects with the advantages of multiple materials,and even transform these multiple materials into new functional materials,such as composite materials with good flexibility and transparent effect.However,the joint manufacturing of different materials often faces the gap between materials,It is difficult to combine because of heterogeneity.Aiming at the existing problems,this paper obtains inspiration from the phenomenon of obtaining strong bonding force through a special structure in nature and life,and puts forward a method of controllable elastic geometric design and optimization of heterogeneous materials for digital manufacturing.Given a three-dimensional object model with known Young’s modulus distribution,under a given load,the sampling points that can represent the distribution of Young’s modulus are extracted by extracting the characteristics of the distribution of Young’s modulus.Based on the extracted sampling points,a cross-linked network that can dominate the mechanical properties of the overall model is further generated.After obtaining the cross-linked network,this paper transforms the cross-linked network into a distance field by constructing an implicit function,and reconstructs the cross-linked network into a three-dimensional model through an improved marching cube reconstruction algorithm.Through the tetrahedral division of the three-dimensional model and the input model,and the simulation analysis,the gap between the sampling point and the target deformation can be obtained.Through the iterative optimization of the distribution of material properties in the cross-linking network,the heterogeneous material composite model with target deformation can be finally obtained.Compared with other manufacturing methods of heterogeneous materials,the method in this paper can obtain new heterogeneous meta-materials with excellent properties and toughening ability of heterogeneous multi-component materials without complex mechanical modification and relying on the combination of traditional additive manufacturing and mold demoulding process.Experiments show that the structure obtained by this method has a significant improvement in geometric modeling complexity and manufacturing complexity.