Thermo-Mechanical Fatigue


Components in high temperature operating environments such as engine pistons, exhaust systems and manifolds can suffer from complex failure modes. The Thermo-Mechanical Fatigue (TMF) option provides solvers for high temperature fatigue and creep by using stress and temperature results from finite element simulations.
Mechanical loads that vary at a different rate to the temperature variations can also be combined. Required material data is derived from standard constant temperature fatigue and creep tests.
High temperature fatigue methods:
        
  • Chaboche method is a stress-life approach that can use elastic stresses from FE and either a constant or cycle-by-cycle temperature correction.
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  • ChabocheTransient method accounts for temperature by normalizing the stress history prior to cycle counting. This method has particular application for finite element analysis where the temperature and stress variation is closely correlated.
Creep analysis methods:
        
  • Larson-Miller uses a master creep curve that is either a paired X-Y curve or a polynomial function to calculate damage per time increment of applied load.
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  • Chaboche creep is a non-linear damage summation approach that uses a set of creep curves, where each curve is for a specific temperature.
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