Istituto di Scienza e Tecnologie dell'Informazione     
Cella A., Carmignani C. Elastic analysis of cracked thin shells. Internal note IEI-B71-10, 1971.
The stiffness matrix is derived for finite elements with a singular stress distribution, and the procedure is given for its assembly into the global stiffness matrix. In particular, the elastic behaviour of thin shells with linear cracks is analyzed using, in the neighbourhood of the tip of the crack, elements with the asymptotic expansion of the solution as a shape function. Such matrices have been developed and tested for plane stress, plate bending and for cylindrical shells problems.

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