Fatigue (material)#Low-cycle fatigue

The Coffin - Manson relationship describes in materials engineering the course of strain SN curve in the low -cycle fatigue range ( LCF), ie, in the range 1-105 swing games. In this field components are so heavily used that plastic deformation occurs in the cycle. According to Coffin and Manson is i.W. in the LCF area the plastic strain amplitude -life determinant:

  • = Ermüdungsduktilitätskoeffizient, roughly equivalent to the true strain at break ( in the quasi-static tensile test).
  • C = Ermüdungsduktiliät; for ductile materials is considered.
  • = Number of cycles to failure.

In a double logarithmic plot, this results in a descending straight line, which is compared to the "normal" SN diagram plotted on the abscissa now.

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