Patterned fibre constrained layer damping for composite materials
Vibration damping is an important consideration in the design of fibre reinforced composite structures as these stiff, lightweight materials often have undesirable vibration transmission characteristics. If not properly addressed, high vibration levels can propagate throughout a composite structure, leading to significant noise levels and reductions in equipment longevity. It is possible to incorporate viscoelastic damping layers into a composite laminate’s construction to achieve improved damping properties. Inclusion of embedded viscoelastic layers results in a constrained layer damping configuration, where the damping capacity is governed by the shear strain in the damping layer. A new composite damping arrangement is proposed where patterned fibre constraining layers are used to increase damping capacity of a viscoelastic mid-layer by inducing additional shear strains. This paper details the design of materials in such a configuration, and the methods used to fabricate and test the damping performance of these patterned fibre constrained layer damping treatments.