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Durability engineering videos

Durability engineering videos

What's New in nCode DesignLife 2020

This webinar will describe enhancements and new functionality introduced in nCode DesignLife 2020, including general enhancements for improving performance in translation and analysis, as well as in the areas of:

  • Fatigue of welds - an easy, new method to recognize seam welds in FE models meshed with solids.
  • Frequency domain fatigue - we’ve improved the ability to mimic a shaker test through sigma clipping, and the sine on random analysis has been expanded to include wideband PSD excitation.
  • Test-CAE Correlation – virtual sensors have been enhanced, making correlation between virtual and test results even easier.
  • Multiaxial – enhancements to stress-based fatigue evaluated with critical plane criteria

Originally presented on March 26, 2020

Notes from the presenter

Thanks for watching - we hope you learned how nCode can help virtually validate the durability of your products through frequency domain fatigue analysis. This live webinar had a lot of interesting discussion in the Q&A session which was not captured in the recording. I’d like to point out a few best practices that came from that discussion:

  • Residual stresses have an important impact on fatigue life. nCode software includes mean stress correction methods and plasticity modeling techniques to account for this. DesignLife can even use residual stresses from FE simulation to improve the fatigue analysis; just make sure to use a compatible mesh for both the dynamic and the residual stress FE solutions, and the stresses can be superimposed to improve the fatigue analysis.
  • Welds can cause durability concerns, which is why DesignLife includes a number of fatigue analysis methods that specifically address weld fatigue. This webinar focused on a method for predicting fatigue life when using models with solid elements. This method is really practical because it’s mesh insensitive. It uses a structural stress approach and welded component SN curves to bring the advantages of mesh insensitivity while still capturing weld effects like the heat affected zone, notch stresses, and residual stresses.
  • A number of questions came up about the correlation of FE stresses vs. strain gage measurements. This correlation is important because we all want to show that our FE simulation is believable, right? As a best practice for correlation, remember that we should always attempt to correlate nominal stresses, not notch stresses. We should stay away from notches and welds, as they have steep stress gradients that are hard to capture repeatably with physical strain gages.
  • Speaking of correlation, the new sigma clipping feature in DesignLife's vibration fatigue module is a great way to improve your ability to simulate the physical shaker test. DesignLife can now simulate the sigma clipping that is present on every shaker rig.




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