Using appropriate force and displacement parameters it is shown that the response of elastomers in multiaxial stress fields is identical to their response to uniaxial stresses. These parameters were chosen from consideration of the molecular model assumed in the theory of Kuhn and Grun [Koll. Z.
, 248 (1942)]. The required force is established to be given by ∣σ∣ = (12+22+32)1/2
where the quantities i
are the forces along orthogonal axes on the deformed cross‐sectional area; the displacement is given by ∣e
∣ = (e12
where the quantities ei
are the strains along three orthogonal axes. The angle between the force and displacement vectors is found to be independent of the axiality of the stress field.