Piezoresistive Material
The Piezoresistive Material is normally used together with a Piezoresistive Effect, Domain Currents multiphysics coupling node. The node is added by default to the Electric Currents interface when adding a Piezoresistivity, Domain Currents predefined multiphysics coupling interface. It is also available from the context menu (right-click the Electric Currents interface parent node) or from the Physics toolbar.
When the Piezoresistive Material node is added to the Electric Currents interface in the absence of an active Piezoelectric Effect, Domain Currents multiphysics coupling node, the material behaves similarly to a Current Conservation node, with electric properties corresponding to the relative permittivity and electrical conductivity entered. The piezoresistive effect is not included in the corresponding equation system.
Piezoresistive Material Property
This node should be used together with an active Piezoresistive Effect, Domain Currents multiphysics coupling node. Select a Constitutive model — Piezoresistance form or Elastoresistance form. For each of the following, the default uses values From material. For User defined enter other values in the matrix or field.
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Specify a Electrical conductivity, zero stress (SI unit: S/m). This typically comes from the material added under the Materials node.
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For Piezoresistance form, select a Piezoresistance coupling matrix Πl (SI unit: m4/(s⋅A2); note that this is equivalent to Ω⋅m/Pa).
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For a Elastoresistance form, select an Elastoresistance coupling matrix Ml (SI unit:  Ω⋅m).