References

A new strain energy function has been presented for the representation of the nonlinear stress-strain behavior of elastic materials. The model assumes the strain energy func-tion to be expressible as a noninteger power series in the strain invariants. Material finite compressibility is included. Ac-curacy of material representation can be enhanced by simply including more terms in the series. Application of the model to data in the literature for a natural rubber shows good agreement for extension ratios up to seven for uniaxial and biaxial stress states. An example calculation of inflation of a sphere is given, using the stress-strain model in a larg