peteroznewman
Subscriber
In 3D, that alternating pattern of +2,-1 nodal forces applied to the quadratic elements creates a perfectly uniform stress on the face of a solid body.
By contrast, linear elements have constant values of nodal forces on the face of a solid mesh to produce perfectly uniform stress.
The NR Residual plot shows Force imbalance. Maybe it is easier to achieve that balance with linear elements than quadratic elements.
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