RF MODULE

3 Select the unnamed1 group and change the Name to Brass.
4 Change the Young’s modulus to 1.05e11 (Pa).
5 Change the Poisson’s ratio to 0.35.
6 Change the Density to 8400 (kg/m 3 ).
7 Change the Thermal expansion coeff. to 2.1e-5 (K −1 ).
8 Change the Thickness to 0.002 (m).
9 On the Load page, select the Include thermal expansion check box.
10 Set Strain temperature to T1 and Strain ref. temperature to T0.
11 Click New to create a new group that inherits the settings for “Brass” and name it
“Steel.”
12 Click the Material tab.
13 Change the Young’s modulus to 2e11 (Pa).
14 Change the Density to 7800 (kg/m 3 ).
15 Change the Thermal expansion coeff. to 1.15e-5 (K −1 ).
16 Click the Boundaries tab. By now, all boundaries, should belong to the “Brass”
group and “Steel” is only there for future use.
17 Click OK.
POINT SETTINGS
Appropriate point settings must be applied to eliminate any translation or rotation of
the structure.
1 In the Point Settings dialog box, select Point 1.
2 Constrain R X , R Y , and R Z to 0.
3 Select Point 3 and constrain R X and R Z to 0.
4 Select Point 13 and constrain R Y and R Z to 0.
5 Click OK.
BOUNDARY CONDITIONS—ALE
The default subdomain setting in ALE is “free displacement,” which is right for this
model. Therefore you only need to set the ALE boundary displacements to the
displacements from the shell application mode.
1 From the Multiphysics menu, select Geom1: Moving Mesh ALE (ale).
2 In the Boundary Settings dialog box, select all boundaries.
102 | CHAPTER 3: RF AND MICROWAVE MODELS