Modeling Segmented Active Constrained Layer Damping Using Hybrid Displacement Field

Abstract

A finite element model for composite plates with active constrained layer (ACL) damping is developed using hybrid displacement fields. The higher order displacement field is used in the composite plate to capture the transverse shear deformations. Since viscoelestic and piezoelectric layers are made from certain isotropic material, the first and the second order displacement fields are employed in these layers to maintain computational efficiency in problem solution. The refined displacement fields defined in different material layers are derived by applying the displacement and transverse shear stress continuity conditions at interfaces of different materials and the traction-free boundary conditions at the top and the bottom surfaces of the structure. The anelastic displacement field method is used to implement the viscoelastic material model to enable time domain finite element analysis. The- finite element model is validated by comparison with NASTRAN 3D finite element modal analysis. The developed technique isused to investigate the dynamic responses of a cantilever composite plate with ACLs. Numerical results are presented with both the open and closed loop control. Significant improvements are observed with the use of active control treatment.