Hyperelasticity Theory Hyperelasticity is a non-linear elastic material model theory that is commonly used to represent the large-strain response of elastomers, rubbers, and other soft flexible materials. Hyperelasticity is popular because is it easy to use in a finite element model, and because it is an available option in all finite element software. However, since the theory is so simple, it can often give inaccurate results and should be used with caution even for elastomers. ...