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.
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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.