Layer Selections

Once a layered material is defined, it is possible to use the layer information while setting up the selections in a physics interface and its different features.

The physics interface and its features have a section named The layer selections interact with the standard selections of geometrical objects (boundary, edges, or points) in order to provide a complete specification of where a material property or boundary condition is to be applied.

The physics features can be of two, fundamentally different, types: Those who act on the layers themselves, and those who act on the interfaces between layers. The settings for these two types of features are slightly different.

The default selections in the section differ between different physics features. This reflects the fact that some physics features (such as thermal expansion) are more likely to be applied to all layers, whereas other features (such as added mass) are more likely to be used for a single layer or interface.

In the drop-down list, you can select

•

. This option is not available for all features.

•

Any defined under in the current component.

•

Any defined under in the current component.

•

Any defined under in the current component.

If you select , you cannot control individual layers; the contribution is given to all layers. All information is taken from the definitions made in the layered material features (, , or ) under in the current component. This means that a single physics node can accommodate several different stacking sequences. As geometrical selection, you can use any object selected in any of the layered material features.

If you select an individual , , or , then you can only select geometrical objects which are part of the selections of that feature. In most cases, you will get access to a list of check boxes where you can further limit the contributions to individually selected layers or interfaces to which this contribution is to be added.

Layer Selections

When a physics feature acts on layers, the interpretation of layer selections are:

•

A boundary selection in the geometry corresponds to a domain contribution in the selected layers.

•

An edge selection in the geometry corresponds to boundary contributions on the faces of the layers exposed to that edge.

•

A point selection in the geometry corresponds to edge contributions on corners of the selected layers meeting at the selected point.

This is illustrated in Figure 3-13 to Figure 3-15 where the patch at the lower left is the actual shell, and the 3D sketch shows an expanded view of what it would represent in the physical world.

Figure 3-13: Boundary selection with layers 2 and 5 selected.

Figure 3-14: Edge selection with layers 2 and 5 selected.

Figure 3-15: Point selection with layers 2 and 5 selected.

Interface selections

When a physics feature acts on interfaces, the interpretation of interface selections are:

•

A boundary selection in the geometry corresponds to boundary contributions on the selected interfaces.

•

An edge selection in the geometry corresponds to edge contributions on the interface edges parallel to the selected edge.

•

A point selection in the geometry corresponds to point contributions on the interface corners located at the selected point.

This is illustrated in Figure 3-16 to Figure 3-18 where the patch at the lower left is the actual shell, and the 3D sketch shows an expanded view of what it would represent in the physical world.

Figure 3-16: Boundary selection with interfaces ‘layer 2 - layer 3’ and ‘layer 5 up’ selected.

Figure 3-17: Edge selection with interfaces ‘layer 2 - layer 3’ and ‘layer 5 up’ selected.

Figure 3-18: Point selection with interfaces ‘layer 2 - layer 3’ and ‘layer 5 up’ selected.