Cerebral berry aneurysms are modeled as a membrane having geometrical spherical symmetry and with properties that combine viscoelastic and plastic behaviour. The forcing action on the membrane is due to the internal pulsatile blood pressure, expressed as a truncated Fourier series, and to the external pressure exerted by the cerebral spinal fluid (CSF) surrounding the aneurysm. A sensitivity and a stability analysis is carried out, and the differences with respect to the purely elastic case are highlighted.
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