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Damage identification using real time rotating field analysis
Lopes, H.; Ribeiro, J.E.; Santos, J.V.A. dos; Vaz, M.A.P.; Gomes, J.F.S.This paper proposes a real time damage identification method based on the perturbation analysis of the rotation field, which are measured using shearography technique. A particular case of phase modulation method is applied to the interference pattern in order to improve the spatial resolution of the rotation field. A program was developed in Matlab® platform for digital recording the information capture by CCD...
New improvements in shearography techniques
Lopes, H.; Vaz, M.A.P.; Guedes, R.M.; Gomes, J.F.S.Shearography is a non-contact full field technique used in the assessment of spatial gradient of displacements through a preset direction, Hung and Taylor [1]. The optical set-up can be based on a Michelson interferometer scheme, for static or quasi-static measurements, and on the Mach- Zehnder interferometer if dynamic measurements have to be performed, Santos et al [2]. In both set-ups a speckle pattern, obta...
The dynamic analysis of piping systems using pseudo-dynamic techniques
Melo, F.J.M.Q. de; Carneiro, J.O.; Lopes, H.; Rodrigues, J.F.D.; Gomes, J.F.S.This paper describes an application of pseudo-dynamic techniques to the dynamic analysis of piping structures. Essentially it consists in coupling a direct time integration algorithm, such as the Newmark method, to an experimental step. At each time step the integration algorithm generates a displacement vector of the structure, which is prescribed for the test specimen. This is mounted in a rigid test rig fitt...
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