Passive damping of laminated composite materials with engineered defects

Thomas H. Fronk; Venkata M. K. Akula; Spencer R. Fugal

doi:10.1117/12.472679

27 June 2002 Passive damping of laminated composite materials with engineered defects

Thomas H. Fronk, Venkata M. K. Akula, Spencer R. Fugal

Proceedings Volume 4697, Smart Structures and Materials 2002: Damping and Isolation; (2002) https://doi.org/10.1117/12.472679
Event: SPIE's 9th Annual International Symposium on Smart Structures and Materials, 2002, San Diego, California, United States

Abstract

Constrained layer damping (CLD) methods provide significant damping in laminated composite materials in bending modes. CLD treatments also provide damping mechanisms in axial modes in structures with significant free edges. Where free-edges are absent such as in cylinders or plates with fixed edges, the damping of axial modes in the structure is limited and damping of bending modes is reduced. This paper investigates an alternate passive geometric treatments that improve damping in constrained layer composite materials. In particular, the effect of including strategically-placed geometric anomalies or wrinkles in laminated composite materials is presented. Correct placement of the anomalies result in increased damping in axial modes due to the three-dimensional stress state created in the viscoleastic layer near the anomaly. Because this method does not depend on strain energies created at the free edge, effective damping of axial modes in cylinders may be realized. A closed-form solution is derived that can be used to conduct parametric design studies. Design parameters include defect placement, defect geometry, and composite material properties.

Citation Download Citation

Thomas H. Fronk, Venkata M. K. Akula, and Spencer R. Fugal "Passive damping of laminated composite materials with engineered defects", Proc. SPIE 4697, Smart Structures and Materials 2002: Damping and Isolation, (27 June 2002); https://doi.org/10.1117/12.472679

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available