A Neo-Hookean solid is a type of hyperelastic (or Green elastic) material that is used to model the behavior of rubber-like materials under large deformations. It is characterized by a specific strain energy density function that is based on the idea of a Hookean solid, which is an ideal elastic material that follows Hooke's law. However, the Neo-Hookean model accounts for non-linear elastic behavior that occurs in materials when deformations are large.
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