Struct EnergyAbsorption 

pub struct EnergyAbsorption {
    pub plateau_stress: f64,
    pub densification_strain: f64,
    pub elastic_modulus: f64,
    pub yield_strain: f64,
    pub foam_density: f64,
    pub thickness: f64,
}

Energy absorption model for foam impact.

Describes the three characteristic regions of foam compression: linear elastic, plateau (constant stress), and densification.

Fields

plateau_stress: f64

Plateau stress [Pa].

densification_strain: f64

Densification strain (typically 0.5–0.9).

elastic_modulus: f64

Young’s modulus in the linear elastic region [Pa].

yield_strain: f64

Yield strain (transition from elastic to plateau).

foam_density: f64

Foam density [kg/m³].

thickness: f64

Foam thickness [m].

Implementations

impl EnergyAbsorption

pub fn new( plateau_stress: f64, densification_strain: f64, elastic_modulus: f64, yield_strain: f64, foam_density: f64, thickness: f64, ) -> Self

Create a new energy absorption model.

pub fn stress_at_strain(&self, strain: f64) -> f64

Stress at a given engineering strain (simplified tri-linear model).

pub fn energy_density(&self, strain: f64) -> f64

Energy absorbed per unit volume up to a given strain [J/m³].

Integrates the stress-strain curve from 0 to strain.

pub fn plateau_energy_density(&self) -> f64

Total energy absorbed through full plateau region [J/m³].

pub fn efficiency(&self, strain: f64) -> f64

Efficiency at a given strain.

eta = W(strain) / (sigma(strain) * strain)

pub fn ideal_efficiency(&self) -> f64

Ideal energy absorption efficiency (rectangular stress-strain).

eta_ideal = 1 for perfect energy absorber.

pub fn specific_energy(&self, strain: f64) -> f64

Energy absorbed per unit mass up to a given strain [J/kg].

pub fn peak_g_force(&self, drop_height: f64) -> f64

Maximum deceleration during impact for given drop parameters.

G = sigma_plateau / (rho_foam * h) where h is the drop height.

pub fn cushion_factor(&self, strain: f64) -> f64

Cushion factor = peak_stress / energy_density at that strain.

Trait Implementations

impl Clone for EnergyAbsorption

fn clone(&self) -> EnergyAbsorption

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for EnergyAbsorption

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq for EnergyAbsorption

fn eq(&self, other: &EnergyAbsorption) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for EnergyAbsorption