A hybrid technique for damage detection on laminated plates

• Author(s): Lopes, H. ; Santos, J.V. Araújo dos ; Guedes, R.M. ; Vaz, M.A.P.
• Date: 2006
• Persistent ID: http://hdl.handle.net/10198/4232
• Origin: Biblioteca Digital do IPB
• Subject(s): Damage detection; laminated plates
• Document Type: Conference Object
• Language: English

Description

This work presents an experimental/numerical technique for delamination damage detection on thin laminated composite plates. The delamination is identified using a technique based on the curvature differences of the plate modes shapes measured before and after impact damage. The natural frequencies are extracted from Frequency Response Functions. A double pulse TV holography is used for no-contact and accurate measurement of the amplitude mode shapes. The curvature is obtained by applying an improved differentiation /smoothing technique to the experimental data. Finally, the curvatures of each mode are subtracted and the damage is located.