Porcine aorta wall modelling non convergence

[jharrisberg]

Hi, I am trying to verify a material model from previous literature, a 5 coefficient mooney rivlin hyperelastic model which I have implemented in abaqus as a polynomial hyperelastic model. However i keep getting the too many increments error indicating non convergence. Im quite new to abaqus and i am not sure where to head next. I have a 5mm squared sample of tissue with 0.06mm thickness. i want to model biaxial loading of the sample and so have applied boundary conditions to two sides of the sample and the opposite sides are loaded with a negative pressure force of 1MPa. any help would be fantastic.