泡沫波纹复合夹心梁等效弹性常数的推导及其振动特性研究

Under the basic assumptions of material continuity and small elastic deformation and obeying deformation coordination, sandwich panel being subjected to bending and torsion, and foam core subjected to shearing, the equivalent elastic constants of the foam-corrugated composite sandwich structure are derived and the corresponding two-dimensional finite element equivalent model and three-dimensional solid model are established. A comparison between the modal experiment of foam-corrugated composite sandwich beam and finite element calculation indicates the correctness of the deduced equivalent elastic constants. The influence of several key geometrical parameters of the foam-corrugated composite sandwich structure on the natural vibration performance is further discussed. It is found that with the increasing panel thickness, the natural frequency heightens; with the increasing thickness of corrugated ribs, foam core density or number of cell, the natural frequency lowers.