The
The equation for the scaling is: scale factor = 1 + alpha * delta_T
➢alpha is the Thermal Expansion Coefficient. The unit for alpha is 1/oC or 1/oF depending on what unit is used for temperature. The default value is 10^-5 /oC (the thermal expansion coefficient for steel) and can be found in the Preferences. This value should be updated if using oF.
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The move is executed as follows:
•The mesh and points are translated out (or in, if the part is cooled down) to show the size of the part after the change in temperature.
oThe actual CAD is not transformed, only the points and the mesh.
•This move is applied as a mean shift, so it will only take place during Analysis or when using Deviate to Offset command.
Steps
1. Add parts button - allows adding one or more parts to be scaled.
2. Set the values for the CTE (Coefficient of Thermal Expansion). The coefficient value can be set for each part if needed (if the parts are made of different materials). If the parts are made from the same material, the same coefficient can be applied to all parts by activating the 'Same CTE' box. The default CTE value can be set in Preferences under the MTM Defaults.
3. Set the temperature value. The Initial Temperature is defaulted to 20 degrees Celsius. The displayed temperature is the final temperature (initial temperature + change in temperature). Temperature value can be set to be the same for all parts by activating the 'Same Temperature' check-box. If unchecked, individual values can be set for each part.
Note:
➢Each part has a Scaling Point as the origin (the zero point) for the expansion. This Scaling Point is by default the first point in the part or the first node of the first feature listed in the part (if no points are created in the part). This information is displayed in the move's Summary page.
➢If you have multiple Thermal Scaling move in a sequence every move will take the original nominal temperature to apply the thermal.
