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--- doc:user:elements:shells:boundary [2013/07/10 15:29] – joris
+++ doc:user:elements:shells:boundary [2015/01/26 10:23] – joris
@@ Line 1: / Line 1: @@
+====== DG shell boundary conditions ======
+Since shell formalism only takes displacements into account, rotating boundary conditions are imposed though a DG formulation.
+===== Materials =====
+As for [[doc:user:start#boundary condition elements]], there is no material to associate to an element.
+===== Elements =====
+Since no material is required, the first stage consists in defining an ElementProperties:
+  prp = ElementProperties(typeEl)
+  prp.put(param1, value1)
+  prp.depend(param1, fct1, Lock1)) #facultatif
+  ...
+where
+|''typeEl'' | desired type of element (for example ''BoundaryDgShellFirstDegreeElement'')|
+|''param1''| name of the property associated to the element (for example ''STIFFMETHOD'')|
+|''value1''| value of the corresponding property |
+|''fct1''| function which characterizes the dependency of the property (optional: no fct if no dependency) |
+|''Lock1''| [[doc:user:general:locks|Lock]] which defines the dependency variable of the property (compulsory if there is a dependency) |
+====  BoundaryDgShellFirstDegreeElement ====
+DG interface element to insert on shell boundaries to provide BCs. These are 2-nodes linear lines, but they are interfering over all neighboring dofs.
+By default, stresses are integrated over dim*2 integration points. The material used is  [[doc:user:elements:shells:interface#dgShellMaterial]].
+====  BoundaryDgShellSecondDegreeElement ====
+Same as ''BoundaryDgShellFirstDegreeElement'', but 8-nodes second order shell element.
+====  BoundaryDgShellNineNodeSecondDegreeElement ====
+Same as ''BoundaryDgShellSecondDegreeElement'', but 9-nodes second order shell element.
+====  BoundaryDgShellSixteenNodeThirdDegreeElement ====
+Same as ''BoundaryDgShellNineNodeSecondDegreeElement'', but 16-nodes third order shell element.
+==== Parameters of shell boundary conditions elements ====
+^   Name            ^     Metafor Code     ^  Dependency ^
+| ''MATERIAL''    | Number of the material to consider              |  -  |
+| ''STIFFMETHOD'' | Method used to compute the stiffness matrix \\ = ''STIFF_ANALYTIC'' : analytic matrix (default) \\ = ''STIFF_NUMERIC''  : numerical matrix            |  -  |
+| ''BENDING_NPG''  | Number of integration points along one direction for bending solving \\ = 2 classical solving  (second order)\\ = 3 EAS solving with 22 or 7 added modes (8 or 9-nodes second order)\\ = 4 solving without EAS (16-nodes third order)|  -  |
+| ''NORMAL_PT1''| First point governing the element of the shell normal |  -  |
+| ''NORMAL_PT2''| First point governing the element of the shell normal |  -  |
+===== Interactions =====
+Once created, the element is generated by a ''DgShellInteraction'':
+  dgBound = DgShellInteraction(number)
+  dgBound.push(gObject1)
+  dgBound.push(gObject2)
+  ...
+  dgBound.addProperty(prp)
+  interactionset.add(dgBound)  # the interaction is added in InteractionSet
+or
+  dgBound = interactionset.add( DgShellInteraction(number) )
+  dgBound.push(gObject1)
+  dgBound.push(gObject2)
+  ...
+  dgBound.addProperty(prp)
+| ''number'' | Number of the material to consider |
+| ''gObject1'', ''gObject2'' | mesh geometric entities |
+| ''prp'' | [[doc:user:elements:general:def_element_properties|Properties]] of the [[#Eléments|DG boundary condition elements]] to generate |
+Generally, entities are lines or groups of nodes on a line.