Design And Optimization Of Bionic Bone Based On Triply Periodic Minimal Surface

Due to its high degree of customization and other advantages,3D printing technology is widely used in defect repair operations in orthopedic surgery.The research of bionic bone is divided into two stages,modeling the bionic bone and printing the entity.There are two modeling methods.The first method is to scan bone joints using spiral CT,and the second method is to construct a porous structure unit cell.The disadvantage of spiral CT scanning is that the internal porous structure of bone cannot be reconstructed,and the unit cell of simple porous structure has sharp edges and poor mechanical properties.This paper presents a design and optimization algorithm of bionic bone based on triply periodic minimal surface.If the macro-scale optimization algorithm is directly used to optimize the microporous structure,there will be some problems,such as insufficient computer memory and low computational efficiency.Therefore,this paper proposes to use the macro-scale optimization algorithm to optimize the large porous structure,and then use the homogenization theory to map the macro pore size to the micro pore size.The algorithm in this paper not only improves the computational efficiency,but also the micro-porous model retains the optimal topological distribution,good stress distribution and better mechanical properties of the macroporous model.The triply periodic minimal surface has many advantages,such as smooth,connected,controllable,etc.The proposed algorithm is used to optimized the porous structure constructed by the triply periodic minimal surface.The optimized microscopic porous structure is similar to the human body’s original bone structure,and has good stress distribution and mechanical properties.Due to the function representation of the triply periodic minimal surface,only the function expression and variable values are needed to transfer,which has a high transmission efficiency.The experimental results show that the algorithm in this paper is still applicable when dealing with models with complex force conditions,and has great potential and application prospects in the design and optimization of medical bionic bones in the future.