MODELLING A NITINOL DEVICE FOR THE REPAIR OF ABDOMINAL AORTIC ANEURYSMS

摘要

It can be seen from the present work, that the superelastic material model for Nitinol provided in the ANSYS finite element code shows a significant sensitivity to both the dissimilarity in tension and compression and the variation under cyclic loading of the material. It also suggests that a more comprehensive material model for use with commercially available finite element software should be investigated; this is outside the scope of the present work. With regard to the modelling of the proximal ring of the endovascular device, future models will be modelled using a 5~(th) cycle model with the inclusion of compression characteristic as the model has been observed to experience cyclic bending throughout its service life in vivo.