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IIW Recommendations

The version currently used in LIMIT® is based on the Recommendations for Fatigue Design of Welded Joints and Components, Second Edition with updates from 2014, International Institute of Welding. The fatigue strength assessment in LIMIT® is based on SN-curves and damage calculation. Nominal and structural stress concepts are supported. The implementation can be used for welded steel and welded aluminum and offers three assessment types:

  • Fatigue against CAFL (Constant Amplitude Fatigue Strength), if no cycle numbers are available
  • Constant amplitude fatigue for very high cycle numbers
  • Variable amplitude fatigue

Further options are available for weld and base material analysis:

  • Consideration of proportional or Un-correlated loading scenarios
  • Thickness correction
  • Consideration of grinding and TIG-dressing
  • Consideration of mean stress sensitivity and reduced residual stresses

Further Information

For detailed information please contact our LIMIT® support.