Class MaterialFatigueCalculator

java.lang.Object

org.episteme.social.architecture.MaterialFatigueCalculator

public final class MaterialFatigueCalculator
extends Object

Predicts material fatigue life and cumulative damage under cyclic loading conditions. It implements Basquin's Equation and the Palmgren-Miner linear damage accumulation rule.

Since:

1.0

Version:

2.0

Author:

Silvere Martin-Michiellot, Gemini AI (Google DeepMind)

Method Summary

Modifier and Type	Method	Description
static Real	cumulativeDamage(double[] cyclesAtStress, double[] capacityAtStress)	Calculates cumulative structural damage using the Palmgren-Miner rule.
static Real	cyclesToFailure(double stressAmplitude, double a, double b)	Estimates the number of cycles to failure (N) using Basquin's Equation.

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

cyclesToFailure

public static Real cyclesToFailure(double stressAmplitude,
 double a,
 double b)

Estimates the number of cycles to failure (N) using Basquin's Equation. Formula: S_amp = a * (N^b) => N = (S_amp / a)^(1/b)

Parameters:

stressAmplitude - the amplitude of the cyclic stress

a - material constant (intercept)

b - material constant (fatigue exponent, usually negative)

Returns:

number of cycles until failure as a Real value

cumulativeDamage

public static Real cumulativeDamage(double[] cyclesAtStress,
 double[] capacityAtStress)

Calculates cumulative structural damage using the Palmgren-Miner rule. Failure is predicted when the damage sum reaches or exceeds 1.0. Formula: Sum(ni / Ni)

Parameters:

cyclesAtStress - array of actual applied cycles (ni) at different stress levels

capacityAtStress - array of corresponding failure capacities (Ni) at those levels

Returns:

cumulative damage fraction (0.0 to 1.0+)