Publicação

An improved numerical-experimental method for damage location in structures

Detalhes bibliográficos
Resumo:	An improvement of a curvature based numerical-experimental method for damage location in structures [1] is presented. The Mach-Zehnder shearography interferometer is used to measure the rotations ﬁeld or the out-of-plane ﬁrst order derivatives of mode shapes displacement ﬁeld [2, 3]. The curvatures or second order derivatives are computed by a numerical method [4]. An aluminum beam with two small transversal cuts was tested for damaged location. The experimental results show a high correlation between the curvatures discontinuities ﬁeld and the damages position. This study also demonstrates the superior performance of the curvature method using measured rotations ﬁeld instead of measured displacements ﬁeld.
Autores principais:	Lopes, Hernani
Outros Autores:	Santos, J.V. Araújo; Soares, C.M. Mota; Guedes, Rui M.; Vaz, M.A.P.
Assunto:	Damage location Rotations ﬁeld Mode shapes curvatures Interferometric techniques
Ano:	2008
País:	Portugal
Tipo de documento:	documento de conferência
Tipo de acesso:	acesso restrito
Instituição associada:	Instituto Politécnico de Bragança
Idioma:	inglês
Origem:	Biblioteca Digital do IPB

Descrição
Resumo:	An improvement of a curvature based numerical-experimental method for damage location in structures [1] is presented. The Mach-Zehnder shearography interferometer is used to measure the rotations ﬁeld or the out-of-plane ﬁrst order derivatives of mode shapes displacement ﬁeld [2, 3]. The curvatures or second order derivatives are computed by a numerical method [4]. An aluminum beam with two small transversal cuts was tested for damaged location. The experimental results show a high correlation between the curvatures discontinuities ﬁeld and the damages position. This study also demonstrates the superior performance of the curvature method using measured rotations ﬁeld instead of measured displacements ﬁeld.