Multiphase Topology Optimization (OPTM) is a simulation technique based on the finite element method capable of determining the optimal distribution of components of two or more materials under thermal and mechanical loads.

The objective of optimization is to minimize the elastic energy of the components. Conventional Topology Optimization that simulates the adaptive mineralization of bone has the disadvantage of continuous mass change in the bone growth process. OPTM, on the other hand, conserves the initial concentration of the material and uses methods adapted to molecular dynamics to find the minimum energy. By applying OPTM to components mechanically loaded with a large number of materials of varying density, the optimization results show graduated porosities and sometimes anisotropic distribution, which simulate the natural structure of bone. This makes it possible to design micro- and macro-structures of mechanical components in a single step. This method uses the latest rapid prototyping, 3D printing and laser sintering techniques to produce lightweight, rigid components with porosities calculated with OPTM.