doc:user:elements:boundaries:pressure_shear
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doc:user:elements:boundaries:pressure_shear [2015/01/26 10:23] – joris | doc:user:elements:boundaries:pressure_shear [2021/09/22 11:45] (current) – [Element] boman | ||
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====== Pressure and shear ====== | ====== Pressure and shear ====== | ||
- | ===== Materials===== | + | 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. | ||
- | Since pressure/ | + | As any finite element, their definition requires an '' |
+ | Unlike contact finite element, there is no " | ||
+ | |||
+ | The '' | ||
+ | |||
+ | These elements should not be mixed with [[doc: | ||
+ | |||
+ | * Pressure and shear are always defined in local axes, so the direction of the resulting force depends on the orientation of the boundary edge/face on which it is applied. | ||
+ | * Pressure is distributed properly over all edges/faces on which the '' | ||
+ | |||
+ | {{ doc: | ||
===== Element ===== | ===== Element ===== | ||
- | Therefore, the first step consist | + | The first step consists |
prp = ElementProperties(typeEl) | prp = ElementProperties(typeEl) | ||
- | prp.put(param1, value1) | + | prp.put(param, value) |
- | prp.depend(param1, fct1, Lock1)) #optional | + | prp.depend(param, fct, lock)) # optional |
... | ... | ||
where | where | ||
- | |'' | + | | '' |
- | |'' | + | | '' |
- | |'' | + | | '' |
- | |'' | + | | '' |
- | |'' | + | | '' |
- | ==== Traction[2|3]DElement ==== | ||
- | Traction/shear element for a mesh made of quadrangles in 2D or hexaedra | + | ==== Pressure2DElement, |
+ | |||
+ | Pressure/shear element for a mesh made of triangles/quadrangles in 2D or hexahedra | ||
=== Parameters === | === Parameters === | ||
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| '' | | '' | ||
+ | <note tip> | ||
- | ==== TriangleTraction3DElement ==== | ||
- | Traction/shear element for a mesh made of tetrahedra | + | ==== TrianglePressure3DElement ==== |
+ | |||
+ | Pressure/shear element for a mesh made of tetrahedra | ||
=== Parameters === | === Parameters === | ||
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| '' | | '' | ||
| '' | | '' | ||
+ | |||
+ | |||
+ | ==== ContactPressure2DElement, | ||
+ | |||
+ | Derivations of '' | ||
+ | To determine the contact status, the contact flag of the previous time step is used. | ||
+ | |||
+ | === Parameters === | ||
+ | |||
+ | The same than in Traction2DElement and Traction3DElement, | ||
+ | |||
+ | ^ Name ^ Description | ||
+ | | '' | ||
+ | | '' | ||
+ | |||
+ | {{ : | ||
+ | |||
===== Interaction ===== | ===== Interaction ===== | ||
- | The interaction is defined as: | + | The interaction |
load = LoadingInteraction(no) | load = LoadingInteraction(no) | ||
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| '' | | '' | ||
- | | '' | + | | '' |
- | | '' | + | | '' |
- | + | ||
- | ==== Remark ==== | + | |
- | + | ||
- | Traction, pressure and shear is generated | + | |
- | + | ||
- | * traction (or pressure/ | + | |
- | * traction is divided properly over all edges/faces on which the '' | + | |
- | {{ doc: | ||
- | :!: Traction element is used backwards in 3D, so a positive value must be applied to generate a pressure. !! |
doc/user/elements/boundaries/pressure_shear.txt · Last modified: 2021/09/22 11:45 by boman