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In the color indicating distance moved or stress? If the latter I would except it to be more towards the middle of the beam?
It probably is strain. Not stress
Ok so to lay people it’s not obvious what the difference is
Stress is a measure of the force applied per unit of area of a cross section of the beam. Like how much force does a part of the beam “feel” passing through it.
Strain is a measure of relative deformation.
In the graphic above strain is visualized with the color scale, and you can see that the more a part of the beam has moved relative to its original state (unloaded, dark blue), the more the color of the part goes up the scale on the side.
Does that make sense? 😅
