A robust procedure for damage identification in a lattice spacecraft structural element by mean of Strain field pattern recognition techniques

J. Sierra, M. Frövel, E. Del Olmo, J. M. Pintado, A. Güemes

    Resultado de la investigación: Capítulo del libro/informe/acta de congresoContribución a la conferenciarevisión exhaustiva

    2 Citas (Scopus)

    Resumen

    A high stiffness and low weight lattice structure for launcher applications made with high modulus carbon fiber was manufactured by EADS CASA Space by using a new cost efficient fiber placement technology. The structure consisted of a composite lattice of intertwined, unidirectional carbon fiber bars. Several Fiber Bragg Gratings (FBGs) were bonded along these bars in order to measure strain during different tests performed on the structure. A robust procedure for defect detection based on Principal Component Analysis (PCA) and strain field pattern recognition techniques was used in order to identify different defects induced in the structure during static testing conducted until fracture. A test campaign of smaller, iso-grid structures was conducted with the aim of studying the sensitivity to detect small defects in the lattice structure. A PCA model was built for the healthy structure. Subsequently, different known damage conditions were projected into the PCA model (baseline). From this projection, various damage indices and detection thresholds were calculated. The results showed that even small damages located far away from the sensors could be detected by this technique.

    Idioma originalInglés
    Título de la publicación alojada16th European Conference on Composite Materials, ECCM 2014
    EditorialEuropean Conference on Composite Materials, ECCM
    ISBN (versión digital)9780000000002
    EstadoPublicada - 2014
    Evento16th European Conference on Composite Materials, ECCM 2014 - Seville, Espana
    Duración: 22 jun. 201426 jun. 2014

    Serie de la publicación

    Nombre16th European Conference on Composite Materials, ECCM 2014

    Conferencia

    Conferencia16th European Conference on Composite Materials, ECCM 2014
    País/TerritorioEspana
    CiudadSeville
    Período22/06/1426/06/14

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