= Strain energy density function
{wiki=Strain_energy_density_function}
The strain energy density function (often denoted as \\( W \\)) is a fundamental concept in the field of continuum mechanics and materials science. It represents the amount of elastic energy stored in a material per unit volume as a result of deformation. The strain energy density function is a scalar function of the strain and, in some cases, the invariants of the deformation tensor that characterizes the mechanical behavior of materials when subjected to external forces.
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