Creep

Use the subnode to define the creep properties of the material model. This material model is available in the Solid Mechanics, Shell, Layered Shell, and Membrane interfaces, and can be used together with , , and .

The Nonlinear Structural Material Module or the Geomechanics Module are required for this material model, and the available options depend on the products used. For details, see http://www.comsol.com/products/specifications/.


	See also Creep and Viscoplasticity in the Structural Mechanics Theory chapter.

Shell Properties

This section is only present when is used as a subnode to:

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in the Layered Shell interface. See the documentation for the Creep node in the Layered Shell chapter.

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in the Shell interface. See the documentation for the Creep node in the Shell and Plate chapter.

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in the Membrane interface. See the documentation for the Creep node in the Membrane chapter.

Creep Data

Nonlinear Structural Materials Module

Select a — , , , , , , , , , or . Then follow the instructions as below.

Geomechanics Module

Select a — , , , or . Then follow the instructions as below.

Norton

For enter the following settings:

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σref. The default is 1 MPa.

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Select the check box to add an “Arrhenius-type” temperature dependence. Then enter a Q.

Norton-Bailey

For enter the following settings:

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σref. The default is 1 MPa.

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Select a — or .

For , enter the m, the tshift and the tref.

For , enter the m, the εshift, and the tref.

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Select the check box to add an “Arrhenius-type” temperature dependence. Then enter a Q.

Garofalo (hyperbolic sine)

For enter the following settings:

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σref. The default is 1 MPa.

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Select the check box as needed. Then enter a Q.

Nabarro-Herring

For enter the following settings:

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Dv.

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Coble

For enter the following settings:

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Dgb.

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Weertman

For enter the following settings:

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D0.

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σref. The default is 1 MPa.

Potential

For enter the following settings:

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η.

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Qcr.

Deviatoric

For enter the ε cre.

Volumetric

For enter the εcr,vol.

User defined

For enter each element for the symmetric εcr. The tensor components are interpreted in the coordinate system of the parent node.


	To compute the energy dissipation caused by creep, enable the Calculate dissipated energy check box in the Energy Dissipation section of the parent material node (Linear Elastic Material or Nonlinear Elastic Material).


	For an example of Norton and Norton-Baily material models, see Combining Creep Material Models: Application Library path Nonlinear_Structural_Materials_Module/Creep/combined_creep.

Location in User Interface

Context Menus

Ribbon

Physics tab with , or node selected in the model tree: