We proposea ni dentificationm ethod fort he determinationofelastomer behaviour whichc ombiness train fieldo btainedb ydigitalimageanalysisa nd theoptimisationo fana proximated stress fielda dapted to thes pecimen geometry.T he chosen loadingt esti sabiaxiale longationp erformed on ac ross specimen. In doing so,w et urnt he problemofheterogeneity into an advantage: it allows thesimultaneous identificationofseveral states of deformation: uni-axial,p lanara nd biaxialt ension. Thes tressf ield is approximated by thes um of ah omogeneous fielda nd an additionalfield.The lattersatisfies theboundary conditions on thefreeedgeand decreases when entering thesample. Thec haracteristic decreasing length is optimized so that thea pproximatef ield globally verifies them omentum equation. It is then possiblet oi dentifyt he hyperelastic potentialb yc alculatinge xplicitly thet wo derivatives f=∂W/∂I 1 and g=∂W/∂I 2
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