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Trace: • StopCriterion • Cold rolling • Viscoelastic laws • Thermomechanical staggered integration scheme • Pressure and shear (Metafor > v3593)
doc:user:elements:boundaries:pressure_shear

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doc:user:elements:boundaries:pressure_shear [2021/09/22 11:43] – bomandoc:user:elements:boundaries:pressure_shear [2026/08/05 09:39] (current) – boman
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-====== Pressure and shear ======+====== Pressure and shear  (Metafor > v3593) ====== 
 +<note important> 
 +This Documentation refers to Metafor version >= 3593. 
 +for more informations on changes see [[https://gitlab.uliege.be/am-dept/MN2L/oo_meta/-/merge_requests/167|MR !167]] for technical informations).  
 + 
 +for a Metafor version < 3593, please refers to this [[pressure_shear_pre3593|page]]. 
 +</note>
  
 Pressure and shear boundary conditions can be applied using special finite elements defined on the boundary of the mesh. The geometry of these elements are lines in 2D corresponding to the boundary edges of the elements of the 2D mesh. Pressure and shear boundary conditions can be applied using special finite elements defined on the boundary of the mesh. The geometry of these elements are lines in 2D corresponding to the boundary edges of the elements of the 2D mesh.
 In 3D, pressure elements are triangles or quads, depending of the shape of the facets of the elements of the mesh near the boundary. In 3D, pressure elements are triangles or quads, depending of the shape of the facets of the elements of the mesh near the boundary.
  
-As any finite element, their definition requires an ''ElementProperty'' object and an ''Interaction'' (''LoadingInteraction''). +As any finite element, their definition requires an ''[[doc:user:elements:general:def_element_properties|ElementProperties]]'' object and an ''Interaction'' (''LoadingInteraction'') and a ''Material''.
-Unlike contact finite element, there is no "material" associated to this kind of element.+
  
-The ''ElementProperty'' contains the type of element and the values for the pressure and the shear, as well as functions defining the time evolution of these values. +The ''[[doc:user:elements:general:def_element_properties|ElementProperties]]'' contains the type of element and integration parameters (number of integration points, stiffness computation method, ...). 
 +The ''PressureMaterial'' contains the values for the pressure and the shear, as well as functions defining the time / space evolution of these values. 
  
 These elements should not be mixed with [[doc:user:conditions:dead_loads|dead loads]]. In most cases, pressure elements should be chosen over dead loads because: These elements should not be mixed with [[doc:user:conditions:dead_loads|dead loads]]. In most cases, pressure elements should be chosen over dead loads because:
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 ===== Element ===== ===== Element =====
  
-Therefore, the first step consists in defining an ''[[doc:user:elements:general:def_element_properties|ElementProperties]]'', as+The first step consists in defining an ''[[doc:user:elements:general:def_element_properties|ElementProperties]]'', as
  
   prp = ElementProperties(typeEl)   prp = ElementProperties(typeEl)
   prp.put(param, value)   prp.put(param, value)
-  prp.depend(param, fct, lock)) # optional+   
 +where 
 +| ''typeEl'' | desired element (for example ''Pressure[2|3]DElement'' - see below)  | 
 +| ''param'' | name of the property associated to the element (e.g. ''NIP'') | 
 +| ''value'' | value of the corresponding property (e.g. the Number of Integration Points)  | 
 +   
 +  mat = materset.define(no, PressureMaterial) 
 +  mat.put(param, value) 
 +  mat.depend(param, fct, lock)) # optional
   ...   ...
  
 where where
-| ''typeEl'' | desired element (for example ''Pressure[2|3]DElement'' - see below)  | +| ''param'' | name of the property associated to the material (e.g. ''PRESSURE'') | 
-| ''param'' | name of the property associated to the element (e.g. ''PRESSURE'') | +| ''value'' | value of the corresponding property (e.g. value for the pressure)  | 
-| ''value'' | value of the corresponding property (e.g. value for the pressure  | + 
-| ''fct''   | function which characterizes the dependency of the property (optional: no fct if the value is constant) | + 
-| ''lock''  | [[doc:user:general:locks|lock]] which defines the dependency variable of the property (e.g. time-dependence = ''TM'')  |+==== PressureMaterial ==== 
 +Material for Pressure Elements  
 +=== Parameters === 
 +^   Name                                          ^     Description       ^  Dependency ^ 
 +| ''PRESSURE''  | Pressure on the entity on which the propriety is applied | time (TM)  \\ position (TX/TY/TZ)  | 
 +| ''SHEAR_KSI'' | Shear along $\xi$ (related to element) on the entity on which the propriety is applied | time (TM) \\ position (TX/TY/TZ)  | 
 +| ''SHEAR_ETA'' | Shear along $\eta$ (related to element) on the entity on which the propriety is applied \\ only usefull for ''Pressure3DElement'' | time (TM) \\ position (TX/TY/TZ)  |
  
  
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 ^   Name                                          ^     Description       ^  Dependency ^ ^   Name                                          ^     Description       ^  Dependency ^
 | ''STIFFMETHOD'' | Method used to compute the stiffness matrix\\ = ''STIFF_ANALYTIC'' : analytic matrix (default)\\ = ''STIFF_NUMERIC''  : numerical matrix  |  -  | | ''STIFFMETHOD'' | Method used to compute the stiffness matrix\\ = ''STIFF_ANALYTIC'' : analytic matrix (default)\\ = ''STIFF_NUMERIC''  : numerical matrix  |  -  |
-| ''PRESSURE'' | Pressure on the entity on which the propriety is applied |  time  | +| ''MATERIAL''    | Number of the ''PressureMaterial''  to consider  | 
-| ''SHEAR_KSI'' / ''SHEAR_ETA''  | Shear along $\xi$ or $\eta$ on the entity on which the propriety is applied |  time  | +| ''NIP''         | Number of integration points by direction (default : 2D 2 / 3D 2x2)    |  -  |
-| ''NPG''    | Number of integration points (default : 2)    |  -  |+
  
-<note tip>Pressure2DElement / Pressure2DElement were named Traction2DElement / Traction3DElement before v3484. The sign of the pressure has also been changed in 2D.  </note> 
  
  
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 ^   Name                                          ^     Description       ^  Dependency ^ ^   Name                                          ^     Description       ^  Dependency ^
 | ''STIFFMETHOD'' | Method used to compute the stiffness matrix\\= ''STIFF_ANALYTIC'' : analytic matrix (default)\\ = ''STIFF_NUMERIC''  : numerical matrix \\ Not applicable, only the numerical one exists ! |  -  | | ''STIFFMETHOD'' | Method used to compute the stiffness matrix\\= ''STIFF_ANALYTIC'' : analytic matrix (default)\\ = ''STIFF_NUMERIC''  : numerical matrix \\ Not applicable, only the numerical one exists ! |  -  |
-| ''PRESSURE'' | Pressure on the entity on which the propriety is applied |  time  | +| ''MATERIAL''    | Number of the ''PressureMaterial''  to consider  | 
-| ''SHEAR_KSI'' / ''SHEAR_ETA''  | Shear along $\xi$ or $\eta$ on the entity on which the propriety is applied |  time  | +| ''NIP''         | Total number of integration points (default : 1)    |  -  |
-| ''NPG''    | Number of integration points (default : 1)    |  -  |+
  
  
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 ^  Name  ^  Description  ^  Dependency  ^ ^  Name  ^  Description  ^  Dependency  ^
-| ''NUM_CONTACT_INTERACTION'' | Number of the contact interaction, which is tested for the contact status |  -  |+| ''NUM_CONTACT_INTERACTION''   | Number of the contact interaction, which is tested for the contact status |  -  |
 | ''TRACTION_AT_TRANSITION_ON'' | If ''True'' (default), the traction of a node belonging to an element at the transition from contact to no contact is not set equal to zero, although the node is in contact  |  -  | | ''TRACTION_AT_TRANSITION_ON'' | If ''True'' (default), the traction of a node belonging to an element at the transition from contact to no contact is not set equal to zero, although the node is in contact  |  -  |
  
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 where where
  
-| ''no''       | number of the ''Interaction''  | +| ''no''                      | number of the ''Interaction''  | 
 | ''gObject1'', ''gObject2''  | meshed geometric entity where the boundary conditions are applied (one part of the boundary of the mesh)  |  | ''gObject1'', ''gObject2''  | meshed geometric entity where the boundary conditions are applied (one part of the boundary of the mesh)  | 
-| ''prp''      | [[doc:user:elements:general:def_element_properties|Properties]] of [[#Element|boundary condition elements]] to be generated  |+| ''prp''                     | [[doc:user:elements:general:def_element_properties|Properties]] of [[#Element|boundary condition elements]] to be generated  |
  
  
doc/user/elements/boundaries/pressure_shear.1632303794.txt.gz · Last modified: by boman
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