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LIFE
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The LIFE module is used to calculate fatigue Life in a FEM (acting as a 'Digital Twin' of a real structure) with a broad palette of Strain based and Stress based approaches.

​The GUI is very intuitive and the analysis process is straightforward.​

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When both FEM and internal stresses are imported, a 'surface-stress-resolving' technique is employed in order to handle, during the calculation, the plane stress tensors which occur at the component surface (in case of shell modelled components this is not done as stresses are naturally planar on the top-bottom faces).

This approach implies that a 'good' mesh refinement is required for a good Fatigue Life estimation.​​

LIFING, however, ​has the possibility to reduce conservatism and run a fatigue  crack initiation assessment by using the "critical distance" method or accounting for the stress gradient effects. In this case also 'internal' stresses are accounted.

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Other than just analysing, the LIFE module can be used for stress tensor time history extraction at selected locations with Virtual Strain Gauge and related Multiaxial Assessments.

The analyst can put on any FEM location (on the surface), a strain gauge and can orient it.

For the selected element

  • the sequence of stress tensors can be visualized and dumped in ASCII files

  • Mohr Circles at defined instant can be visualized

  • Multiaxial Assessment can be performed (scatter plots for showing Maximum Principal direction variation over the time as well as Biaxiality ratio variation over the time.

Time histories can be exported and/or handled as following:
This module allows to perform the following tasks.

  • Filter sequence. The following methods are included:

  • Non-turning points filtering (always active)

  • Racetrack filtering

  • Modified. The following options are available:

      Scaling (entire sequence or a portion)    

      Offsetting (entire sequence or a portion)

      Negative values scaling

      Clipping

  • Cycle counted. The Range-Pair method is implemented as per the ASTM STP1006 standard. The output cycles sequence is dumped in a ASCII file. The option to dump the counted sequence in AFGROW format is available.

  • Exceedence plots and Range-Mean Hystograms can be visualized

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​​​​​​​​​​​​​​​​​​​​​​​​​​Element stress tensor sequences can be also filtered with the Multiaxial Racetrack Filter.

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