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doc:user:conditions:dead_loads

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doc:user:conditions:dead_loads [2015/01/08 15:49] bomandoc:user:conditions:dead_loads [2016/03/30 15:23] (current) – external edit 127.0.0.1
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-====== "Dead" Loads ====== + 
-{{:doc:user:ico-advanced.png?40 |Advanced}} +====== Prescribed Nodal "Dead" Loads ====== 
-Dead loads are forces that are directly prescribed at the nodes of the mesh. The amplitude and direction of such forces is known a priori. It is usually a bad idea to define dead loads in a model.+ {{:doc:user:ico-advanced.png?40|Advanced}}{{:doc:user:ico-danger.png?40|Danger!}} 
 +Dead loads are forces that are directly prescribed at the nodes of the mesh. The amplitude and direction of such forces is known a priori. In particular it is independent from the deformation of the underlying material. Such forces also strongly depend on the chosen mesh desnity. Changing the mesh usually requires complete redefinition of these forces.
  
-To model loads (pressure and shear) which depends on the deformed configuration, use [[doc:user:elements:boundaries:pressure_shear]].+<note important>As a consequence, it is usually a bad idea to define nodal "dead" loads in a model. To model realistic loads (pressure and shear) which depend on the deformed configuration and do not depend on the mesh density, use [[doc:user:elements:boundaries:pressure_shear]].</note>
  
-{{ doc:user:cha.gif |doc:user:cha.gif}} +Anyway, the command used for the definition of "dead loads is the same as [[doc:user:conditions:displacements]] except that [[doc:user:general:locks|Field1D]] refers to a force instead of a displacement.
- +
-The command is the same as [[doc:user:conditions:displacements]] except that [[doc:user:general:locks|Field1D]] refers to a force instead of a displacement.+
  
doc/user/conditions/dead_loads.1420728561.txt.gz · Last modified: 2016/03/30 15:22 (external edit)

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