Shell Element

This command is used to construct a ShellMITC4 element object, which uses a bilinear isoparametric formulation in combination with a modified shear interpolation to improve thin-plate bending performance.

element ShellMITC4 $eleTag $iNode $jNode $kNode $lNode
        $secTag

eleTag

unique element object tag

iNode jNode kNode lNode

four nodes defining element boundaries, input in counter-clockwise order around the element.

secTag

tag associated with previously-defined SectionForceDeformation object. Currently must be either a PlateFiberSection, or ElasticMembranePlateSection


NOTE:

  1. 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.
  2. It is a 3D element with 6 dofs and CAN NOT be used in 2D domain.

Examples

<pre> set t 100.0 model basic -ndm 3 -ndf 6 nDMaterial ElasticIsotropic 1 200000 0.3 nDMaterial PlateFiber 4 1 set secArgs “7” section PlateFiber $secArgs 4 $t set EleType ShellMITC4 block2D $n1 $n2 1 1 $EleType $secArgs { 1 0.0 0.0 0.0 2 0.0 10 0.0 3 1000 10 0.0 4 1000 0.0 0.0 } </pre>

REFERENCES:

Dvorkin,Bathe, A continuum mechanics based four node shell element for general nonlinear analysis, Eng.Comput.,1,77-88,1984


Original implementation: Ed “C++” Love Reimplementation by: Leopoldo Tesser, Diego A. Talledo, Véronique Le Corvec

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