Multi-Objective optimization of Biomechanical Properties of a Pyramid Cellular Lattice Structure for Bone Replacement

Cellular materials are commonly used for bone replacement in individuals with bone damages. Biocompatibility and mechanical properties that are similar to those of bones are essential considerations for developing novel cellular materials. To achieve structures with the best performance, an optimization method is used for a hexagonal pyramid unit cell in this research. Considering the aforementioned factors in designing the new structure, we have used three cost functions. These cost functions are set to minimize the elastic modulus, minimize the ratio of surface-to-volume, and maximize the ratio of stress value. In addition, a genetic algorithm has been utilized to make the optimization a multi-objective one. As a result, the new unit cell exhibits improved cell migration and bone regeneration characteristics. The results of the multi-objective optimization showed that the dimensions of pyramids should be modified to make the vertices closer to each other. According to the cost functions, it has been concluded that the length of the sides of double hexagonal pyramids should be as close as possible to their maximum values.

کلیدواژه ها:

Optimization ، Genetic algorithm ، Mechanical properties ، Unit cell.