Modeling of Progressive Damage in the Adhesive Bond Layers of Actuated Plates
Final technical rept.
MARYLAND UNIV COLLEGE PARK DEPT OF AEROSPACE ENGINEERING
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This report discusses finite element modeling of progressive damage in the adhesive bond layers of actuated plates and investigates the reduction in actuation capacity caused by the damaged bond layers. The primary challenge posed by this class of problems stems from the vast range of geometric scales that are represented, with the thickness of the adhesive layer representing the smallest scale, the overall thickness of the actuated plate representing the intermediate scale and the in-plane dimensions of the plate representing the largest scale. In multiscale problems, the overall efficiency of the numerical methodology is of paramount importance, thus model development is guided by the need to obtain a sufficiently accurate solution at an acceptable computational expense. In this study, this goal is achieved through the use of a hierarchical, displacement-based, 2-D finite element model that includes the first-order shear deformation model FSD, type-I layerwise models LW1 and type-II layerwise models LW2 as special cases. Both the LW1 layerwise model and the more familiar FSD model use a reduced constitutive matrix that is based on the assumption of zero transverse normal stress however, the LW1 model includes discrete layer transverse shear effects via in-plane displacement components that are Cexp-0 continuous with respect to the thickness coordinate. The LW2 layerwise model utilizes a full 3-D constitutive matrix and includes both discrete layer transverse shear effects and discrete layer transverse normal effects by expanding all three displacement components as Cexp-0. continuous functions of the thickness coordinate. The results clearly demonstrate that the resulting model can efficiently simulate progressive damage in the adhesive layers.
- Numerical Mathematics
- Adhesives, Seals and Binders