Topological design of the hybrid structure with high damping and strength efficiency for additive manufacturing

Purpose Three-dimensional (3D) printing provides more possibilities for composite manufacturing. Composites can no longer just be layered or disorderly mixed as before. This paper aims to introduce a new algorithm for dual-material 3D printing design. Design/methodology/approach A novel topology design method: solid isotropic material with penalization (SIMP) for hybrid lattice structure is introduced in this paper. This algorithm extends the traditional SIMP topology optimization, transforming the original 0-1 optimization into A-B optimization. It can be used to optimize the spatial distribution of bi-material composite structures. Findings A novel hybrid structure with high damping and strength efficiency is studied as an example in this work. By using the topology method, a hybrid Kagome structure is designed. The 3D Kagome truss with face sheet was manufactured by selective laser melting technology, and the thermosetting polyurethane was chosen as filling material. The introduced SIMP method for hybrid lattice structures can be considered an effective way to improve lattice structures' stiffness and vibration characteristics. Originality/value The fabricated hybrid lattice has good stiffness and damping characteristics and can be applied to aerospace components.