Frequency of transverse vibration of regular polygonal plates with a concentric, circular orthotropic patch

A first order approximation treatment of the case where a repair is made of the central portion of a vibrating isotropic plate of regular polygonal shape using a material of circularly anisotropic constitutive characteristics is presented. The mathematical model is also valid in the case of a vibrating isotropic plate where the central core has been damaged and it is assumed that this subdomain of the plate acquires polarly orthotropic properties.Fil: Gutierrez, Ruben Hector. Universidad Nacional del Sur. Departamento de Ingeniería; ArgentinaFil: Laura, Patricio Adolfo Antonio. Universidad Nacional del Sur. Departamento de Ingeniería; ArgentinaFil: Rossit, Carlos Adolfo. Universidad Nacional del Sur. Departamento de Ingeniería; Argentin