Hexagon MSC CAEfatique 2025.2 | 4.4 Gb
Hexagon is proud to announce the release of CAEfatique 2025.2 is a random response and vibration fatigue solver for the frequency domain plus a fatigue solver for the time domain.

Summary CAEfatique 2025.2 Release Highlights
Major updates and enhancements in CAEfatigue 2025.2 are
Fatigue Damage Spectra (FDS)
- Calculation of FDS from single and summed events
- Derivation of equivalent Power Spectral Densities (PSDs)
Frequency domain Envelopes
- Envelope visualization across all frequency-domain solvers
- Statistical analysis of envelopes
- Generation of damage-adjusted envelopes based on damage potential
Robust Design enhancements
- New correlation convergence plots as sample sizes increase
- Specialized fringe plot and parameter export filters driven by decision map
Random response fatigue analysis
- New workflow to support fatigue calculations directly from Nastran H5 random response data
- Enables Diffuse Sound Field vibro-acoustic fatigue analysis using Actran workflow manager

What's New in CAEfatigue 2025.2

Fatigue Damage Spectra (FDS) in CAEfatigue
Description:
This release introduces Fatigue Damage Spectra (FDS) analysis utilizing the Henderson & Piersol* formulation for generating surrogate loads from time histories and PSDs. Calculates damage spectra for single events and derives equivalent Power Spectral Densities (PSD) via Inverse FDS. A new "SN from m and c" material model support simple SN description, along with access to the full material database.
Benefits:
- Ease of use: visualization of channel and overall envelopes
- Simplification: damage equivalent load across multiple events
- Insight: consistent comparison across multiple events
Who needs it:
- Durability/fatigue CAE engineers performing frequency domain life estimations
- Test engineers processing equivalent/simplified shaker loads

Fatigue Damage Related Descriptor for Random Vibration Test Environments, by G.R. Handerson and A.G. Piersol
New Frequency domain envelopes in CAEfatigue
Description:
New envelope analysis capabilities have been implemented to enhance result visualization across all frequency-domain solvers. Enables the display and statistical analysis of envelopes when connected to FFT, PSDM, or Load Scheduler inputs. Generation of damage-adjusted envelopes, allowing for the normalization of signal envelopes based on calculated damage potential.
Benefits:
- Ease of use: visualization of channel and overall envelopes
- Simplification: damage equivalent load across multiple events
- Insight: consistent comparison across multiple channels/events
Who needs it:
- Durability/fatigue CAE engineers performing frequency domain life estimation
- Test engineers processing equivalent/simplified shaker loads

Improved visualization and parameter filtering in Robust Design
Description:
This release significantly advances the Robust Design analysis capabilities with new visualization, parameter filtering and debugging tools. A new "Convergence Plot" in the Ant-Hill view allows engineers to track Spearman and Pearson correlation quantities as sample sizes increase. The Decision Map now drives a specialized fringe plot for visualizing element-based correlations, and export-to-csv functionality has been integrated directly into the map to respect active filters.
Benefits:
- Ease of use: correlation visualization as model fringe plots
- Efficiency: deeper insight into statistical convergence
- Collaborative: easy filtering and exporting of metamodel parameters
Who needs it:
- Structural CAE engineers performing stochastic function studies and uncertainty quantification

Random Response Fatigue Analysis in CAEfatigue
Description:
A new workflow has been implemented to support fatigue calculations directly from random response data (Nastran H5). This capability, driven by the new psdresp load type , allows frequency-domain fatigue analysis using response PSDs generated by external solvers like Actran or Nastran, without the need for transfer functions. The implementation includes a dedicated "Random Response" load scheduler event, control file generation, and support for both single and multi-event scenarios.
Benefits:
- Ease of use: direct result access with dedicated Random-Response option
- Speed and efficiency: no need to store/read transfer functions or calculate PSDs
- Collaborative: allows for vibroacoustic DFS and fatigue combining Actran and Nastran
Who needs it:
- Structural and vibroacoustic CAE engineers performing durability assessment under random vibration excitation typical of Aerospace and Defence.

Product improvements and enhancements
Relevant product improvement in CAEfatigue 2025.2
Weld Analysis Enhancements
- Thickness correction support for frequency-domain workflows. H5 result format now support thickness correction, ensuring accurate stress scaling for shell elements in weld fatigue calculations.
- Abaqus ODB reader features intelligent cache management and enhanced spot weld parsing for complex coupling definitions.
Worst Layer
- The Fringe Plotter now includes a "Worst" layer option. This feature calculates the maximum (or minimum, for inverse metrics like FOS) value for each element across all layers. Specifically helpful for composite layered output (frequency domain only).
Table Import/Export Enhancements
- Directly import data into tables from a variety of file formats, including Control Files (CF), CSV, and Time History files (RSP, DAC, TXT, PCH). Additionally, table data can be exported to CSV.
Aero Load Spectrum Scalability
- The Aero Load Spectrum capability has been optimized to handle a significantly larger n