Adding two plasticities to one material about underworld2 HOT 3 OPEN

Just figured out there is a way by setting materials.stressLimiter. But is there a way to give explicit equations of Perierls creep and DruckerPrager to one material at the same time in UWGeodynamics? Thanks!

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Hi @bush2014, unfortunately there is no explicit equation to setup the Peierls mechanism in UWGeodynamics.
From Gerya, Introduction to Numerical Geodynamic Modelling, p178 Peierls comes in as an exponential creep term. UWGeodynamics does have the functionality to do a harmonic mean of effective viscosities see here, but an explicit peierls implementation is missing.

If you're keen to implement a mechanism for peierls you would have to implement a new rheology class in UWGeodynamics. Something like

Another approach would be to implement the model using only underworld function calls. (i.e. not UWGeodynamics)

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Hi Julian, thank you so much for your prompt response. Those suggestions are incredibly valuable, and I'm eager to put them into practice. Now I will see if it will work by simply setting a stressLimiter. The function for calculating the harmonic mean is also a valuable addition to my toolkit. Again, thank you for your thorough response.

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