Damping performance of cocured composite laminates with embedded viscoelastic layers

Janet M. Biggerstaff; John B. Kosmatka

doi:10.1117/12.310676

16 June 1998 Damping performance of cocured composite laminates with embedded viscoelastic layers

Janet M. Biggerstaff, John B. Kosmatka

Proceedings Volume 3327, Smart Structures and Materials 1998: Passive Damping and Isolation; (1998) https://doi.org/10.1117/12.310676
Event: 5th Annual International Symposium on Smart Structures and Materials, 1998, San Diego, CA, United States

Abstract

Cocuring viscoelastic damping materials in composites has been shown to be successful in greatly increasing the damping of composite structures. The damping performance, however, is often not as high in cocured composites as in secondarily bonded composites, where the damping material does not undergo the cure process. The reason for the discrepancy in damping between the cocured and secondarily bonded samples was found to be resin penetration into the damping material. Samples with a barrier layer between the damping material and the epoxy resin had a 15.7% to 92.3% higher loss factor (depending on the frequency) than cocured FasTape^TM 1125 samples without the barrier and at least 168% higher loss factor than cocured ISD 112 samples without the barrier. These higher damping values are very close to the values achieved by secondarily bonding. Viscoelastic damping materials typically have maximum recommended temperatures below that of the composite cure cycles. The effect of cure temperature on viscoelastic damping materials was also studied and it was determined that most damping materials are marginally affected by cure cycle temperature.

Citation Download Citation

Janet M. Biggerstaff and John B. Kosmatka "Damping performance of cocured composite laminates with embedded viscoelastic layers", Proc. SPIE 3327, Smart Structures and Materials 1998: Passive Damping and Isolation, (16 June 1998); https://doi.org/10.1117/12.310676

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