docsgood first issue
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Description
Having a how-to on calculating reaction forces and comparing the accuracy would probably be nice.
Is a good first issue, so providing some details from Slack:
Calculating the reaction forces can be done in two ways in Ferrite,
- Calculate the traction at the boundary using the solution field to get the correct strains (and thus stresses), and then integrate to get the total reaction on the boundary.
- Get the residual vector on the boundary by assembling the internal force vector considering the solution field, and extracting the constrained degrees of freedom (I usually use a dummy constraint handler to do this).
The second option is more accurate (specifically it will give the exact result if the loading was a body load), but the first option is a bit easier to implement. Both are mathematically correct and will converge to eachother assuming a sufficiently fine mesh.