Allow implementing hyperelastic materials that depend on displacement gradient #62
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…nt gradient By depending on nabla u instead of the deformation gradient F, we can avoid the loss of accuracy in forming F, which causes a severe loss of accuracy for very stiff materials subject to small displacements.
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By depending on$\nabla u$ instead of the deformation gradient $F$ , we can avoid the loss of accuracy in forming $F$ , which causes a severe loss of accuracy for very stiff materials subject to small displacements.
This is a preliminary stopgap design. Longer term we might consider making the entire hyperelastic material trait depend on$\nabla u$ instead of $F$ , and rewriting all materials to use more numerically stable implementations.