Difference between revisions of "Thermal FEA Calculations"
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(Created page with "Thermal calculations include stress and strains induced by temperature differentials. == Introduction == NairnFEA can do thermoelastic calculations. In the presence of ...") |
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Thermal calculations include | Thermal calculations include stresses and strains induced by temperature differentials. | ||
== Introduction == | == Introduction == | ||
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[[NairnFEA]] can do thermoelastic calculations. In the presence of temperature differentials, the calculations will find thermal stresses and strains. This section is for FEA only; see separate help on [[Thermal Calculations|thermal calculations]] when doing MPM calculations with[[OSParticulas]] and [[NairnMPM]]. | [[NairnFEA]] can do thermoelastic calculations. In the presence of temperature differentials, the calculations will find thermal stresses and strains. This section is for FEA only; see separate help on [[Thermal Calculations|thermal calculations]] when doing MPM calculations with[[OSParticulas]] and [[NairnMPM]]. | ||
== | == Temperature Settings == | ||
Thermal strains | Thermal stresses and strains are induced when the temperature in an element differs from the stress free temperature., which is set in the <tt>StressFreeTemp</tt> command. In scripted input files, the command is: | ||
StressFreeTemp (temp) | StressFreeTemp (temp) | ||
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where <tt>(temp)</tt> is the stress free temperature in degrees. The default value is 0. Note that some [[Material Models]] and [[Traction Laws]] depend on the stress free temperature on an absolute temperature scale and therefore calculations that use those models should always set this temperature in degree Kelvin. | where <tt>(temp)</tt> is the stress free temperature in degrees. The default value is 0. Note that some [[Material Models]] and [[Traction Laws]] depend on the stress free temperature on an absolute temperature scale and therefore calculations that use those models should always set this temperature in degree Kelvin. | ||
<p>The <code>Temperature</code> command sets temperature conditions to all nodes:</p> | |||
<pre>Temperature #1 | |||
</pre> | |||
<p>where</p> | |||
<ul> | |||
<li>#1 is an <a href="function.html"> user-defined function</a> that gives the temperature on each node as a function of the coordinates of the node. The calculation will have residual stresses if it is a composite having materials with different thermal expansion coefficients or if the temperature field is non-uniform. | |||
</li> | |||
Revision as of 09:56, 10 September 2013
Thermal calculations include stresses and strains induced by temperature differentials.
Introduction
NairnFEA can do thermoelastic calculations. In the presence of temperature differentials, the calculations will find thermal stresses and strains. This section is for FEA only; see separate help on thermal calculations when doing MPM calculations withOSParticulas and NairnMPM.
Temperature Settings
Thermal stresses and strains are induced when the temperature in an element differs from the stress free temperature., which is set in the StressFreeTemp command. In scripted input files, the command is:
StressFreeTemp (temp)
In XML input files, the command, which must be in the [[MPM Input Files#MPM Header}<MPMHeader>]] block is
<StressFreeTemp>(temp)</StressFreeTemp>
where (temp) is the stress free temperature in degrees. The default value is 0. Note that some Material Models and Traction Laws depend on the stress free temperature on an absolute temperature scale and therefore calculations that use those models should always set this temperature in degree Kelvin.
The Temperature command sets temperature conditions to all nodes:
Temperature #1
where
- #1 is an <a href="function.html"> user-defined function</a> that gives the temperature on each node as a function of the coordinates of the node. The calculation will have residual stresses if it is a composite having materials with different thermal expansion coefficients or if the temperature field is non-uniform.