2Applications of Equilibrium Thermodynamic Degradation to Complex and Simple Systems: Entropy Damage, Vibration, Temperature, Noise Analysis, and Thermodynamic Potentials

2.1 Cumulative Entropy Damage Approach in Physics of Failure

Entropy is an extensive property. If we isolate an area enclosing the system and its environment such that no heat, mass flows, or work flows in or out, then we can keep tabs on the total entropy (Figure 2.1).

In this case the entropy generated from the isolated area has

the total entropy of a system is equal to the sum of the entropies of the subsystems (or parts), so the entropy change is

This seemingly obvious outcome (Equation (2.2)) is an important result not only for complex system reliability, but also for device reliability. This will be detailed throughout this chapter. ...

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