What's New in Celsius Thermal Solver 2022.1 – #1 Viscoelastic Material Properties

This What’s New series lists new and enhanced features of Cadence^® Celsius Thermal Solver in the Systems Analysis 2022.1 base release. The Sigrity and Systems Analysis (SIGRITY/SYSANLS) 2022.1 release is now available for download at Cadence Downloads.

Viscoelastic Material Properties Added to the Material Manager: You can now define viscoelastic properties of materials to study the structural response of your design with respect to stress and temperature. In Celsius, viscoelastic properties are represented by the Prony series calculations, as per the following expression:

Where G₀ is the instantaneous shear relaxation moduli, G_i is the Prony series coefficient, and τ_i is the relaxation time for each Prony component.

Note: This option is available only with Celsius - Solid Objects Simulation for 3D Structures and Fluid Flow Simulation.

The viscoelastic material properties can be defined in the Structural tab of the Material Manager window. For this select Tools – Edit Library – Material. This opens the Material Manager Window. Here select Material on left side of window and then select Structural on right side of window. To specify the viscoelastic material properties, right-click Viscoelastic and select Enable from the context menu.

Click Add to add new values for G(Pa) and t(s). By default, Celsius uses WLF (Williams-Landel-Ferry) equation as the Shift function. The WLF equation describes how the viscoelasticity of materials changes with temperature and time.

Next, specify the values for Reference Temperature and C1 and C2, where:

Reference temperature is the glass-transition temperature at which the material starts to change from hard to soft and C1 and C2 are temperature-dependent empirical constants.

For detailed information, refer to Celsius Thermal Solver User Guide