Structural failures due to a single static loading are rare. The majority of structural failures are fatigue failures caused by fluctuating loads. Stress-life (SN) and strain-life (EN) are CAE fatigue analysis methodologies that can be used to predict service life in a virtual environment.  ANSYS nCode DesignLife has both SN and EN fatigue engines, but which method should be used? It depends upon the application.

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