Thermal FEA Calculations - Revision history

Nairnj: /* Introduction */

2013-09-11T21:30:31Z

Introduction

← Older revision		Revision as of 21:30, 11 September 2013
Line 3:		Line 3:
	== Introduction ==		== 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\|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 [[NairnMPM]].

	== Temperature Settings ==		== Temperature Settings ==

Nairnj: /* Notes */

2013-09-10T17:20:25Z

Notes

← Older revision		Revision as of 17:20, 10 September 2013
Line 26:		Line 26:
	== Notes ==		== Notes ==

	# The thermal stresses and ~~strain~~ depend only of the difference between temperature and the stress free temperature, which means the absolute values of these numbers do not matter. The difference, however, should be in degrees C (or K).		# The thermal stresses and strains depend only of the ''difference'' between temperature and the stress free temperature, which means the absolute values of these numbers does not matter. The difference, however, should be in degrees C (or K).

Nairnj: /* Temperature Settings */

2013-09-10T17:19:35Z

Temperature Settings

← Older revision		Revision as of 17:19, 10 September 2013
Line 21:		Line 21:
	where		where

	* <tt>(temp)</tt> is an temperature or a [[User ~~Define~~ Functions\|user defined function]] 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.		* <tt>(temp)</tt> is an temperature or a [[User Defined Functions\|user defined function]] 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.
	* <tt>(reftemp)</tt> is the stress free temperature in degrees. The default value is 0.		* <tt>(reftemp)</tt> is the stress free temperature in degrees. The default value is 0.

Nairnj: /* Temperature Settings */

2013-09-10T17:18:20Z

Temperature Settings

← Older revision		Revision as of 17:18, 10 September 2013
Line 21:		Line 21:
	where		where

	* (temp) is an temperature or a [[User Define ~~Function~~]] 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.		* <tt>(temp)</tt> is an temperature or a [[User Define Functions\|user defined function]] 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.
	* (reftemp) is the stress free temperature in degrees. The default value is 0.		* <tt>(reftemp)</tt> is the stress free temperature in degrees. The default value is 0.

	== Notes ==		== Notes ==

	# The thermal stresses and strain depend only of the difference between temperature and the stress free temperature, which means the absolute values of these numbers do not matter. The difference, however, should be in degrees C (or K).		# The thermal stresses and strain depend only of the difference between temperature and the stress free temperature, which means the absolute values of these numbers do not matter. The difference, however, should be in degrees C (or K).

Nairnj: /* Temperature Settings */

2013-09-10T17:17:40Z

Temperature Settings

← Older revision		Revision as of 17:17, 10 September 2013
Line 12:		Line 12:
	StressFreeTemp (reftemp)		StressFreeTemp (reftemp)

	In <tt>XML</tt> input files, the commands must be in a <tt>Thermal></tt> block:		In <tt>XML</tt> input files, the commands must be in a <tt><Thermal></tt> block:

	<Thermal>		<Thermal>

Nairnj: /* Temperature Settings */

2013-09-10T17:17:17Z

Temperature Settings

← Older revision		Revision as of 17:17, 10 September 2013
Line 7:		Line 7:
	== Temperature Settings ==		== Temperature Settings ==

	Thermal stresses and strains are induced when the temperature ~~in an element~~ differs from the stress free temperature. The temperature field (which may be non uniform) and the stress free temperature are set with the following commands. In scripted input files, the commands are:		Thermal stresses and strains are induced when the temperature on the nodes differs from the stress free temperature. The temperature field (which may be non uniform) and the stress free temperature are set with the following commands. In scripted input files, the commands are:

	Temperature (temp)		Temperature (temp)
Line 22:		Line 22:

	* (temp) is an temperature or a [[User Define Function]] 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.		* (temp) is an temperature or a [[User Define Function]] 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.
	* (reftemp) is the stress free temperature in degrees. The default value is 0.		* (reftemp) is the stress free temperature in degrees. The default value is 0.

	== Notes ==		== Notes ==

	# The thermal stresses and strain depend only of the difference between temperature and the stress free temperature, which means the absolute values of these numbers do not matter. The difference, however, should be in degrees C (or K).		# The thermal stresses and strain depend only of the difference between temperature and the stress free temperature, which means the absolute values of these numbers do not matter. The difference, however, should be in degrees C (or K).

Nairnj at 17:16, 10 September 2013

2013-09-10T17:16:06Z

← Older revision		Revision as of 17:16, 10 September 2013
Line 1:		Line 1:
	Thermal calculations include stresses and strains induced by temperature differentials.		Thermal calculations in FEA include stresses and strains induced by temperature differentials.
	__TOC__		__TOC__
	== Introduction ==		== Introduction ==

Nairnj at 17:15, 10 September 2013

2013-09-10T17:15:51Z

← Older revision		Revision as of 17:15, 10 September 2013
Line 1:		Line 1:
	Thermal calculations include stresses and strains induced by temperature differentials.		Thermal calculations include stresses and strains induced by temperature differentials.
			__TOC__
	== Introduction ==		== Introduction ==

Line 24:		Line 24:
	* (reftemp) is the stress free temperature in degrees. The default value is 0.		* (reftemp) is the stress free temperature in degrees. The default value is 0.

	== ~~Note~~ ==		== Notes ==

	# The thermal stresses and strain depend only of the difference between temperature and the stress free temperature, which means the absolute values of these numbers do not matter. The difference, however, should be in degrees C (or K).		# The thermal stresses and strain depend only of the difference between temperature and the stress free temperature, which means the absolute values of these numbers do not matter. The difference, however, should be in degrees C (or K).

Nairnj at 17:15, 10 September 2013

2013-09-10T17:15:30Z

← Older revision		Revision as of 17:15, 10 September 2013
Line 3:		Line 3:
	== Introduction ==		== 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\|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 ==		== 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 ~~<tt>StressFreeTemp</tt> command~~. In scripted input files, the ~~command is~~:		Thermal stresses and strains are induced when the temperature in an element differs from the stress free temperature. The temperature field (which may be non uniform) and the stress free temperature are set with the following commands. In scripted input files, the commands are:

	StressFreeTemp (~~temp~~)		Temperature (temp)
			StressFreeTemp (reftemp)

	In <tt>XML</tt> input files, the ~~command, which~~ must be in ~~the [[MPM Input Files#MPM Header}~~<tt>~~<MPMHeader~~></tt>]] block is		In <tt>XML</tt> input files, the commands must be in a <tt>Thermal></tt> block:

	<StressFreeTemp>(~~temp~~)</StressFreeTemp>		<Thermal>
			<Temperature>(temp)</Temperature>
			<StressFreeTemp>(reftemp)</StressFreeTemp>
			</Thermal>

	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

			* (temp) is an temperature or a [[User Define Function]] 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.
			* (reftemp) is the stress free temperature in degrees. The default value is 0.

	~~<p>The <code>Temperature</code> command sets temperature conditions to all nodes:</p>~~		== Note ==

	~~<pre>Temperature #1~~
	~~</pre>~~

	~~<p>where</p>~~

	~~<ul>~~		# The thermal stresses and strain depend only of the difference between temperature and the stress free temperature, which means the absolute values of these numbers do not matter. The difference, however, should be in degrees C (or K).

	~~<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>~~

Nairnj at 16:56, 10 September 2013

2013-09-10T16:56:31Z

← Older revision		Revision as of 16:56, 10 September 2013
Line 1:		Line 1:
	Thermal calculations include ~~stress~~ and strains induced by temperature differentials.		Thermal calculations include stresses and strains induced by temperature differentials.

	== Introduction ==		== Introduction ==
Line 5:		Line 5:
	[[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]].

	== ~~Stress Free~~ Temperature ==		== Temperature Settings ==

	Thermal strains ~~and stresses~~ are ~~always calculated relative to~~ the stress free temperature, which is set in the <tt>StressFreeTemp</tt> command. In scripted input files, the command is:		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)
Line 16:		Line 16:

	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>