A regular mesh, all elements the same size and shape, usually is not practical because of stress concentrations. Shifting of mid-side nodes closer to some corner of the domain helps to refine (make smaller elements) mesh near this corner. The size of the elements can be varied by placing nodes 2, 4, 6, or 8 at some point other than the center of the side. Movement of these nodes shifts the origin of the coordinate system and produces a pattern similar to the one in Fig.10. These mid side nodes must remain within the interval:
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Fig. 10. A region with a change in element size. |
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