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I'm doing a dynamic analysis with a human head neck system. I apply a dynamic impact to the head and i want to measure the head's motion. I obtain some results like stresses and displacements. But i want to measure some point's angle changes while moving, at the end of the analysis due to its original position at the start of the analysis.
I assume you have a solid model (brick or tet elements) and therefore cannot plot a contour of the rotation results ("Results Contours > Displacements > Rotation" or something like that). I can think of two different options:
Calculate the angle between 3 points (or 2 lines formed by 4 points). This can be done using vector math which you should be able to find in a book on geometry or calculus.
There are two types of elements that give rotation results: shell elements and beam elements. So if you need the rotation result at a few nodes, apply a few beam elements in the area of interest.
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