Quadratic Quadrilateral Element (Q8)

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Quadratic Quadrilateral Element (Q8)


There are eight nodes for this element, four corner nodes and four mid-side nodes (Fig.22). In the natural coordinate system (ξ, η), the eight shape functions are:













The displacement field is given by:







which are quadratic functions over the element. Strains and stresses over a quadratic quadrilateral element are linear functions that are better representations.




Fig.22. Quadratic quadrilateral element (Q8).









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