Dear all,

During my research on rubber materials, I am trying to match results about aneurysm in rubber.

I am using an interesting paper:

Finite deformations of an initially stressed cylindrical shell under internal pressure International Journal of Mechanics Sciences vol.50 pp.92-103 (2008).

I am not a specialist in non-linear analysis, so something in the setting of my model (especially) for the Riks analysis could be wrong.

I cannot success in find out a localized aneurysm such as in the paper.

I am using ABAQUS as used in the paper.

However there are some aspects in the paper that not convince me so much.

So any advice/hints could be very useful.

Results presented are a comparison between ABAQUS and experimental results.

Material parameters used to describe the material and reported in the paper are:

Neo-Hookean C1 = 0.201906 MPa C2 = 0 MPa

MooneyRivlin C1 = 0.087167MPa C2 = 0.150843MPa

Ogden mu = 1.55886MPa alpha = 0.403913

First of all:

If I insert these parameters into ABAQUS and then I evaluate the material, seems that strain-stress curve for Ogden material and Mooney-Rivlin describe a totally different materials.

Anyone was involved in this kind of problems?

Any other paper present in literature about same problems?

If someone interested I can supply the .inp file of my analysis.

Thank you in advance for any answers/critics/suggestions.

Andrea