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The fatigue solution that makes the impossible possible
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CAEfatigue radically changes the available capabilities that companies can use to do Frequency Domain analysis for random response, durability and fatigue.
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Ford Motor Company
Spot and seam weld fatigue analysis is critical to an automobile’s long-term durability. Learn how Ford Motor Company applied a new and unique Frequency Domain approach for spot welds. Presented at NAFEMS World Congress 2019
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Fiat Chrysler Automobiles
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A new simulation technique developed in partnership between FCA & CAEfatigue Ltd. allows for a simplified duty cycle on the lower control arm, resulting in a better long-term design. Click here to learn more
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OHB SE
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CAEfatigue helps OHB SE develop new satellite payload designs by utilizing next-generation collision detection technology, which is calculated during the random dynamics analysis. Presented at NWC 2017
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Navistar, Inc.
Solver-Embedded Fatigue
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Learn how Navistar used CAEfatigue to successfully combine the two separate tasks of stress analysis and secondary fatigue analysis into one solver-embedded fatigue analysis task. Presented at 2014’s SAE International Conference
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Hero Motor Corp.
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Learn how Hero uses CAEfatigue to simulate and predict proving ground testing loads of next generation motorcycles

CAEfatigue FREQUENCY Package

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Base Shake PSD Analysis plus Mean Loads plus Deterministic Loading
CAEfatigue is designed to provide the user with both the random response results and the fatigue results from a structure undergoing loading input from a single random PSD with or without additional loading from deterministic inputs and mean offsets. Response outputs includes mean stress, RMS stress or strain, mean stress plus RMS stress or strain, moments, zero crossings, peaks per second and irregularity factor. Fatigue results including damage, life and margin of safety from a single random input.

The loading inputs needed for CF can come from Optistruct, Nastran, Ansys or Abaqus generated from (virtually) any size model. Examples of inputs are simultaneous wide band and narrow band inputs, wide band random and swept sine inputs, wide band random and deterministic inputs, wide band and swept narrow band inputs, swept narrow band or swept sine wave.

Multi Input PSD Analysis for Multi-Channel, Multi-Event Loading
CAEfatigue offers all the input / output options mentioned for Base Shake loading plus the ability to use multiple random input PSDs (and cross PSDs) with mean offsets; i.e., data from a test rig with multiple events and multiple channels per event plus a mean offset. This module offers random response and S-N and/or E-N fatigue results generated from the multiple simultaneous correlated load inputs, with any number of DOF’s, inputs, events and frequencies. Coupled with advanced random analysis, CF becomes a powerful tool for understanding output results for displacement, velocity, acceleration, force, stress, strain and fatigue (damage / life).

Conditioning and Conversion of Time Signals to PSDs
For those who only have multi-channel, multi-event time histories, CAEfatigue offers a separate toolset called TIME2PSD. Historical loads conditioning procedures involve a series of user options that are hard for a typical engineer or designer to implement. Some of these have now been automated in the CF TIME2PSD approach. Window length (FFT buffer size), window overlap, and initial deletion of non-relevant parts of the signal can all be done automatically. The toolset provides a way to correctly eliminate sections of the time history that do not contribute to the damage. Conditioning is vital to ensure the damage from the time history is correctly transferred to the Power Spectral Density (PSD). The toolset also converts multi-input time histories to a PSD matrix that organizes, labels and tracks the PSDs to correctly account for cross correlation effects. An option also exists to switch on or off, the correlation terms to evaluate the influence on damage. The connections with solver subcase ID’s are automatically dealt with so the user does not have to take extra time managing the data.

For general and product specific platform support, please visit our Platform Support page.

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