HMSC chap3

## Modeling Damage

• Quantifying damage levels
• Predicting the rate of change of damage

### Static damage models

• Useful for simulating the effects of different types of damage
• Geometric models(chage in area)
• Material parameter models (change in modulus or density, percent fraction or filament)
• Impedance models

### Dynamic damage models

• Predict the rate at which damage accumulates
• General dynamic damage law
  • incorporates both the internal load to component in the damaged area and the damage level
    ### Failure models
• Based on maximum stress, maximum strain and other critera

### Performance models

• Model of finding useful life of the components
• Components reach the end of useful life long before they fail