Bivariate B-spline surfaces on the invariant domain provide non-separable hyperelastic energy models that are calibrated instantaneously via linear least squares from homogeneous deformation stresses.
Convexity conditions and existence theorems in nonlinear elasticity.Archive for rational mechanics and Analysis63, 337–403 (1976)
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Data-adaptive spline surfaces for non-separable hyperelastic energy functions
Bivariate B-spline surfaces on the invariant domain provide non-separable hyperelastic energy models that are calibrated instantaneously via linear least squares from homogeneous deformation stresses.