Piezoresistive Effect, Shell
The Piezoresistive Effect, Shell multiphysics coupling node () computes the appropriate conductivity tensor according to the mechanical stress or strain from the Linear Elastic Material node in the Shell interface and the piezoresistivity properties from the Piezoresistive Material node in the Electric Currents, Shell interface. The computed conductivity tensor is passed to the Current Conservation node in the Electric Currents, Shell interface.
Settings
The Label is the default multiphysics coupling feature name.
The Name is used primarily as a scope prefix for variables defined by the coupling node. Refer to such variables in expressions using the pattern <name>.<variable_name>. In order to distinguish between variables belonging to different coupling nodes or physics interfaces, the name string must be unique. Only letters, numbers, and underscores (_) are permitted in the Name field. The first character must be a letter.
The default Name (for the first multiphysics coupling feature in the model) is pzrs1.
Boundary Selection
Only boundaries that have both Piezoresistive Material selected in the Electric Currents, Shell interface and Linear Elastic Material selected in the Shell interface are applicable.
Coupled Interfaces
This section defines the physics involved in the Piezoresistive Effect, Shell multiphysics coupling. The Shell and Electric currents, shell lists include all applicable physics interfaces.
The default values depend on how the Piezoresistive Effect, Shell node is created.
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If it is added from the Physics ribbon (Windows users), Physics contextual toolbar (Mac and Linux users), or context menu (all users), then the first physics interface of each type in the component is selected as the default.
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If it is added automatically when a Piezoresistivity, Shell multiphysics coupling interface is selected in the Model Wizard or Add Physics window, then the participating Shell and Electric Currents, Shell interfaces are selected.
You can also select None from either list to uncouple the Piezoresistive Effect, Shell node from a physics interface. If the physics interface is removed from the Model Builder, for example if Shell is deleted, then the list defaults to None as there is nothing to couple to.
If a physics interface is deleted and then added to the model again, then in order to reestablish the coupling, you need to choose the physics interface again from the lists. This is applicable to all multiphysics coupling nodes that would normally default to the once present interface. See Multiphysics Modeling Workflow in the COMSOL Multiphysics Reference Manual.