Damage localisation in beams using the ritz method and speckle shear interferom...

• Author(s): Santos, J.V. Araújo dos ; Lopes, H. ; Ribeiro, J.E. ; Maia, N.M.M. ; Vaz, M.A.P.
• Date: 2010
• Persistent ID: http://hdl.handle.net/10198/2658
• Origin: Biblioteca Digital do IPB
• Subject(s): Damage detection; Ritz method; Timoshenko beam theory; Rotation field; Spatial derivative; Shear interferometry
• Document Type: Conference Object
• Language: English

Description

A novel numerical-experimental technique is developed in order to minimise some of the difficulties exhibited by others damage localisation approaches. The present technique relies on the computation of undamaged rotation fields using the Ritz method and the Timoshenko beam theory, while the measurement of damaged rotation fields is performed by speckle shear interferometry. Two damage localisation indicators are also presented, which, instead of being based on the second derivative of displacement fields, are based on the first spatial derivative of rotation fields. These damage localisation indicators, the modified curvature difference (MCD) and the modified damage index (MDI), were applied successfully in the localisation of damage in two clamped-clamped aluminium beams.