pub fn elastic_energy_density(stress: f64, strain: f64) -> Option<f64>Expand description
Computes elastic strain-energy density.
Formula: u = 0.5 * σ * ε.
Returns None when the result is negative or when any input or result is not finite.
§Examples
use use_elasticity::elastic_energy_density;
assert_eq!(elastic_energy_density(100.0, 0.01), Some(0.5));