Hyperelastic materials (Simcenter Samcef)

A hyperelastic material is a type of constitutive material model that is used to analyze materials that can experience large elastic strain that is recoverable.

You can only use these materials in Simcenter Samcef structural non-linear analyses.

The following table lists the hyperelastic materials supported by Samcef.

Hyperelastic material type	Command
Ogden	.MAT BEHAV "Ogden"
Alexander	.MAT BEHAV "Alexander"
Hart-Smith	.MAT BEHAV "Hart-Smith"
Mooney-Rivlin	.MAT BEHAV "Mooney"

Ogden material

You define the Ogden material properties on the Strain Energy page in the Manage Materials dialog box.

You can choose between a Strain Energy Potential in terms of Bulk Modulus or a Strain Energy Potential in terms of Compressibility definition law.

Property	Notes
MU	μ coefficients.
Alpha	α coefficients.
Di	Appears if Strain Energy Potential in terms of Compressibility is selected.D coefficients.

Note:

The λ terms of the equations are the principal stretch ratios.

Alexander material

You define the Alexander material specific properties on the Mechanical page in the Manage Materials dialog box.

Property	Notes
C1, C2, C3, C4, C5	Ci coefficients.
K	K coefficient.

Hart-Smith material

You define the Hart-Smith material specific properties on the Mechanical page in the Manage Materials dialog box.

Property	Notes
A, B, C	A, B, C coefficients.
Compressibility Coefficient (BULK)	K coefficient.

Mooney-Rivlin material

You define the Mooney-Rivlin material specific properties on the Distortional Deformation page in the Manage Materials dialog box.

In the Distortional Deformation - (Aij) table, the Simcenter Samcef Ci coefficients of the law are defined as:

Row	Column 1	Column 2	Column 3	Column 4	Column 5
1		C2	C5	C9	C14
2	C1	C4	C8	C13
3	C3	C7	C12
4	C6	C11
5	C10

Linear part of the law

The coefficients: C1, C2.

Parabolic part of the law

The coefficients: C3, C4, C5.

Cubic part of the law

The coefficients: C6, C7, C8, C9.

4th order part of the law

The coefficients: C10, C11, C12, C13, .C14

The K bulk coefficient is defined in the Mechanical page in the Manage Materials dialog box.

Hyperfoam material

You define the Hyperfoam material specific properties on the Mechanical page in the Manage Materials dialog box.

Property	Notes
MU	μ coefficients.
Alpha	α coefficients.
Beta	β coefficients.

For more information, see the Samcef material page.

Where do I find it?

Application	Pre/Post
Prerequisite	Simcenter Samcef as the selected solver
Command Finder	Manage Materials
Location in dialog box	From the Type list, choose:Mooney-Rivlin→Create Material .Hart-Smith→Create Material .Ogden→Create Material .Alexander→Create Material Foam→Create Material

Look up more details

Hart-Smith Material Definition dialog box (Simcenter Samcef)

Alexander Material Definition dialog box (Simcenter Samcef)

Foam Material Definition dialog box (Simcenter Samcef Structure)

Mooney-Rivlin Material Definition dialog box

Ogden Material Definition dialog box

Quick links

Command reference

Pre/Post video examples

Bulk Entry Descriptions

Simcenter 3D tutorials

Browse Simcenter 3D help by product area

Hyperelastic materials (Simcenter Samcef), Simcenter 3D 2021.1 Series

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