Function elastic_energy_density 

pub fn elastic_energy_density(stress: f64, strain: f64) -> Option<f64>

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));