Solid Mechanics monograph example: deflection results are same for different materials?

I am working some examples as shown in the following page -

https://reference.wolfram.com/language/PDEModels/tutorial/StructuralMechanics/SolidMechanics.html

The simple beam example I am working now is titled

:Overview example and analysis types

To illustrate the usage of the finite element method in solid mechanics it is instructive to present a simple example and give an overview of the setup, various analysis types and post processing steps possible."

When running the model using aluminum, Iron and then Titanium, I get the same end deflection of the beam.

I comment out all materials but one under evaluation, run the model and examine the plot - all plots look the same for 3 different materials.

Code is below -



The Young's modulus of all materials are sufficiently different that a different plot should show differences.



We can compare displacement for different material using VectorDisplacementPlot3D with special options, for example,



I think the comment from @Dunlop put it very well. Rephrasing:

VectorDisplacementPlot3D will automatically rescale the deformation to make it visible. The actual, very small deformation can be seen by specifying the option VectorSizes -> Full. For this reason it is useful to plot a legend that quantifies the displacement.

The visualization of the actual deformation can be done with:



And because the displacement will be very small for many displacements you compute - especially in the linear elastic case - the displacement plots auto scale them to make them visible. I have added a note to this effect in the monograph to hopefully make this clear to future readers.