New Functionality in Version 4.3

  • New functionality for modeling piezoresistivity:
  • Three new Piezoresistivity interfaces for modeling piezoresistivity in shells, in domains, or with boundary currents.
  • Piezoresistive material library for single crystal and polycrystaline p- and n-doped silicon.
  • S-parameter calculations: You can now compute S-parameters for piezoelectric, electric, and electromechanical devices.
  • Improvements to the Electromechanics physics interface: The Electromechanics interface has been improved and upgraded in a number of ways. The Electromechanical Solid node has been merged with the Linear Elastic Material node to produce a new feature the Linear Elastic Dielectric. Backward compatibility code handles the conversion of models from 4.2a to 4.3 using this feature; however, the electrostrictive material constants will not be transferred because these have been redefined in version 4.3 for improved compatibility with standard reference texts (for example, Stratton, Electromagnetic Theory, Adams Press, March 15, 2007; Landau and Lifshitz, The Electrodynamics of Continuous Media, Elsevier, 1968). A new Linear Elastic Material node has been added to enable the solution of problems in which solving for the potential within the solid is not required. The Electromechanical Interface node now appears on the top level as a default boundary condition and will automatically obtain the correct selections from both of these domain level features. Finally the Frequency Domain and Eigenfrequency study types are no longer supported. Because the problems solved by the electromechanics interface are inherently nonlinear, it is important to use the linearized approach employed in the Prestressed Analysis, Frequency Domain and the Prestressed Analysis, Eigenfrequency study types. Existing models with these study types will still open and solve as before, but in the case of the Frequency Domain study type, the results are likely to be misleading. As a result of general improvements to the interface, the results obtained from the prestressed analyses may change in version 4.3.
  • Coordinate visualizations make it possible to visualize the different material orientations in stacks of piezoelectric materials.
  • New periodic boundary conditions: Dynamic cyclic symmetry and Floquet periodicity conditions for solid mechanics and piezoelectric models.

New Models

  • Capacitive pressure sensor
  • Piezoresistive pressure sensor
  • Electrostatically actuated cantilever
  • Shear modes in a quartz oscillator

Backward Compatibility vs. 4.2a

  • The nonlinear structural mechanics functionality is version 4.2a is now available in the Nonlinear Structural Materials Module, which is an add-on to the Structural Mechanics Module. See Nonlinear Structural Materials Module.

Backward Compatibility vs. Version 3.5a

Film Damping

  • Perforated plates are not yet available. These have to be modeled in version 4.3 using the full geometric description or using the equation view.