Enhanced Strain Quadrilateral Element

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This command is used to construct a four-node quadrilateral element, which uses a bilinear isoparametric formulation with enhanced strain modes.

element enhancedQuad $eleTag $iNode $jNode $kNode $lNode type $matTag

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$eleTag	unique element object tag
$iNode $jNode $kNode $lNode	four nodes defining element boundaries, input in counter-clockwise order around the element.
$type	string representing material behavior. Valid options depend on the NDMaterial object and its available material formulations. The type parameter can be either "PlaneStrain" or "PlaneStress."
$matTag	tag of nDMaterial

NOTE:

1. PlainStrain only.
2. The valid queries to a Quad element when creating an ElementRecorder object are 'forces', 'stresses,' and 'material $matNum matArg1 matArg2 ...' Where $matNum refers to the material object at the integration point corresponding to the node numbers in the isoparametric domain.

EXAMPLE:

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Code Developed by: Edward Love, Sandia National Laboratories