Nonlinear Materials (Partial Differential Equations Toolbox)

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Pablo 2023-3-7

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评论： Thomas 2024-9-11

Hello,

For those familiar to the topic. How can I use the following function:

structuralProperties(structuralmodel,'PoissonsRatio',0.3, ...

'YoungsModulus',210E3);

For nonlinear materials? Meaning the value of the Young's modulus varies after the yield strenght of the material is surpassed.

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William Rose 2023-3-10

@Pablo, you're welcome.

Thomas 2024-9-11

Agree'd it's a shame - something I'd like to see included / become a little easier in future.

For the structural mech documentation the Youngs Modulus has to be a positive number.

https://uk.mathworks.com/help/pde/ug/pde.structuralmodel.structuralproperties.html#d126e138802

For the unified workflow (which appears how things are going) under Material Property Assignments the Youngs Modulus can be of type: positive number | three-element vector of positive numbers | function handle the catch here is that it can only depends on space then - not local elemental stress.

https://uk.mathworks.com/help/pde/ug/pde.materialproperties.html

Still, function handles can be useful, I'm currently trying to see if I can relate a third variable to this spatial field, i.e. temperature and damage and then use that to indirectly vary the stiffness. For details, see Nonconstant Parameters of Finite Element Model.

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