NEiFatigue

by Noran Engineering

NEiFatigue (WinLife) allows engineers to calculate the fatigue life of components under dynamic loading. The fatigue life can be calculated by using a classical Nominal Stress method, or by using the more sophisticated Local Strain method.

Capabilities

• Fatigue Calculation without FEM
  • Classical methods: nominal stress concept and local concept
  • Stress S-N curves and mean stress sensitivity are required for the nominal stress concept
  • Cyclic stress-strain curves, strain e-N curves and damage parameter curves according to Smith, Watson and Tooper are required for the local concept
  • Component loading is provided for both methods
  • Loading history (stress, moment, force) obtained from a measurement can also be used
  • Rainflow method used for counting of stress histories
  • Easy to use Load Spectrum generator
  • S-N curve generator for steel, aluminum alloys and cast iron
  • Fatigue life database calculated (can be extended by the user); contains S-N curves and data describing the damage for materials commonly used
  • Rainflow matrix plots
  • Load spectrum plots
  • Load hysteresis plots
  • Damage XY and Contour plots
     
• Fatigue Calculation Combined with FEM
  • Static FE calculation is used to ascertain the stress within the component
  • The direction of the standard load must correspond to the actual force
  • Critical nodes can be selected for the fatigue life calculation thus reducing the calculation time
  • S-N curves for failure probabilities between 0 and 100% can be created
     
• Multiaxial Calculation
  • Method used when several loadings have an effect on a structure and are not in sync, and not proportional
  • Up to 100 loadings working independently can be taken into account
  • Should be used if the principal stress directions vary considerably in the component as the calculation is very time consuming
  • Applications: bodywork structures, axle components, crankshafts, rotary blades for wind power stations
  • Strain measurement data can be used