polyrethane

Hello everybody

well i am new in modeling of polymers in abaqus. I would like to test the uniaxial test in traction of polyrethane. I did the experimental test i took the data (strain and stress) and used it in modeling in abaqus the numerical test. i chosed the hyperelastic response. My question is : 

is my choice good (hyperelastic behaviior) 

when i run the job i have no permanent deformation but when i unload the specimen return to its initial position.

Any suggestion or help please