Evolutionary Structural Optimization Of Multi-material Structure Considering Mechanical Behavior Of Heterogeneous Material Interface

Multi-material structure is widely used in aerospace,automobile industry and other fields due to its light weight and multi-function characteristics.In recent years,with the development of multi-material additive manufacturing technology,multi-material structures can be manufactured more conveniently and quickly,making multi-material structures more widely used in engineering.In a multi-material structure,the interface between heterogeneous materials as part of the structure will also have an important impact on the performance of the structure.Based on Bi-directional Evolutionary Structural Optimization(BESO),this work develops a multi-material topology optimization method that considers the mechanical properties of the material interface.The main research work is introduced as follows:Firstly,the development process of BESO method and its application expansion in topology optimization design of multi-material structure are reviewed.Based on this method,the research of multi-material structure design is conducted and the corresponding design platform is built.Under various working conditions and optimization parameters Designed to verify the effectiveness and reliability of the design platform,and based on the design platform to further develop the multi-material microstructure configuration topology optimization design.Secondly,based on the already built multi-material BESO method,a multi-material topology optimization method considering the interfacial behaviors is proposed.Interfacial behaviors are simulated together with simulation for the whole structure.Sensitivities are accordingly derived to achieve structural stiffness maximization design.A series of comparison investigation has been performed for various design parameters.Finally,the developed method is further applied for the design of shell-infill structures.By filling the infill regions with lattices of different structural configurations and volume fractions,the mechanical properties of the structures with different infills are compared,and the results are verified by loading tests on the structure after 3D printing.