Development of a numerical model for the damage identi®cation on composite plate structures
نویسنده
چکیده
This paper deals with a numerical technique for the identi®cation of damage on laminated structures. The numerical model is based on a ®rst-order shear deformation ®nite element. When the structure undergoes some kind of damage, its stiness is reduced, changing the dynamic response. By considering the sensitivities of the orthogonality conditions of the mode shapes, an algorithm is formulated, which calculates a damage parameter in each ®nite element. The damage parameter is directly related to the stiness reduction of the damaged ®nite element. Only the mechanical properties of the layers of the undamaged plate and the natural frequencies and mode shapes of the damaged plate are required. The proposed numerical model allows the identi®cation of multiple damage and does not require the knowledge of the probable damaged areas. The algorithm is applied to a laminated rectangular plate and its eciency is demonstrated through several damage simulations. Ó 1999 Elsevier Science Ltd. All rights reserved.
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