Numerical Results

Here, we find the strain of each surface bodies along their lengths. We do this using the local coordinate system of each gauge which is given to us from the elemental triad solution.

The video mentions that you need to pay attention to the sign of the strain value only, not the direction of the coordinate system. For example,  you should not be concerned, if say, the x-direction for one of your gauge points in the opposite direction of the other two gauges in the rosette. This is because the strain transformation is invariant when you rotate a coordinate direction by 180 deg. The transformation formula, 

, has cos(2*theta) and sin(2*theta). When theta = 180deg, cos(2*theta) and sin(2*theta) will be the same as when theta = 0. 

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