A novel multi-scale modeling strategy based on variational asymptotic method for predicting the static and dynamic performance of composite sandwich structures

• Published in: Applied mathematical modelling Vol. 135; pp. 1 - 25
• Main Authors: Zheng, Shi, Ligang, Qi, Xiaogang, Liu, Qian, Liu, Hongbing, Chen
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.11.2024
• Subjects: 3D printing; Composite sandwich structure; Equivalent homogenized model; Static and dynamic responses; Variational asymptotic method; Static and dynamic responses; Composite sandwich structure; Equivalent homogenized model; Variational asymptotic method; 3D printing
• ISSN: 0307-904X
• DOI: 10.1016/j.apm.2024.06.027

To establish a universal and convenient mathematical model for predicting static and dynamic performance of composite sandwich structures, a novel three-dimensional equivalent homogenized model (3D-EHM) is proposed based on variational asymptotic method. The multiscale mechanical analysis of composite hexagonal and re-entrant honeycomb sandwich structures is conducted by 3D-EHM, enabling reasonable transmission of mechanical information at different scales and facilitating accurate predictions of mechanical responses in sandwich structures. The comparison analysis with 3D printing experimental results and 3D finite element model results demonstrates that the 3D-EHM exhibits remarkable precision and computational efficiency in forecasting static displacement distributions and higher-order vibration modes, eliminating the need for time-consuming and expensive experiments. Moreover, the effects of the ply angle of the face sheet and core geometric parameters on the effective properties of composite hexagonal honeycomb sandwich structures are systematically investigated. In summary, 3D-EHM is an effective applied mathematical model for designing and analyzing composite sandwich structures, fully combining the systematicity of variational methods and the asymptotic convergence of asymptotic methods. •A novel three-dimensional equivalent homogenized model (3D-EHM) is proposed.•Calculation accuracy and efficiency in predicting mechanical response are high.•Intrinsic connection between microstructure and macroscopic properties is captured.•3D-EHM facilitates the tailoring and optimization of the sandwich structure.