create a FEA of cantilever beam model that has predefined initial strain

I would like to create a simple FEA of cantilever beam model that has predefined initial strain of and is applied a load at the tip edge. However I do not know how to add the predefined initial strain.

Answer 1

[Ayush]

Hi @Andreia Sousa da Silveira

I understand that you want to add the predefined initial strain to your cantilever beam. To apply the predefined initial strain, you can directly modify the nodal coordinates of the mesh. For example, if you want to apply an initial strain of ε to the beam, you can displace the corresponding co-ordinates using:

structuralBC

• Refer to this documetation link to apply displacement boundary conditions: https://www.mathworks.com/help/pde/ug/pde.structuralmodel.structuralbc.html#d126e128677

Also, define the load that will be applied at the free end of the beam. This can be done by specifying the magnitude and direction of the load. For example, you can apply a load using:

structuralBoundaryLoad

• Refer to this documetation link to apply boundary load: https://www.mathworks.com/help/pde/ug/pde.structuralmodel.structuralboundaryload.html

Thank you,

Ayush Jaiswal

[Andreia Sousa da Silveira]

Dear Ayush, Thank you for your reply. I still do not understand how to use the structuralBC to add initial strain on to the whole model. I need to create a simple beam model of a bone (poisson of 0.3 and elastic modulus of 12GPa) that has a residual strain of 0.1% due to the mineral composition and add load at the edge face that is not constrain and see how it behaves.

[Ayush]

Hi @Andreia Sousa da Silveira Would displacing the free edge face corresponding to the residual strain help?

% Apply initial strain to the whole model
initialStrain = -0.001;  % Initial strain
initialDisplacement = initialStrain * Length;  % Calculate the initial displacement for the whole model
structuralBC(model, 'Face', 6, '"XDisplacement"', initialDisplacement);