Damage Interface Material definition dialog box (Simcenter Samcef/Simcenter Nastran/Simcenter 3D Multiphysics)

For complete details on the Damage Interface parameters, see Samcef Materials entry in the Samcef documentation.

Elastic characteristics

Transverse Stiffness (K03S)	Lets you specify the transverse stiffness (mandatory).For more information, see the K03S parameter of the Samcef damage interface material page.
Shear Stiffness (K02) Shear Stiffness (K01)	Lets you specify the shear stiffnesses. The isotropic model requires only the Shear Stiffness (K02) value (mandatory) while the anisotropic model also requires the Shear Stiffness (K01) value. For more information, see the K02S parameter of the Samcef damage interface material page.

Damage and plastic behavior

Fracture Toughness (GIc -GP) Fracture Toughness (GIIc - GP) Fracture Toughness (GIIIc - GP)	Lets you specify the critical energy release rates. Both Fracture Toughness (GIc -GP) and Fracture Toughness (GIIc - GP) values are mandatory. For more information, see the GP parameter of the Samcef damage interface material page.
Coupling Coefficient	Lets you specify the coupling coefficient.For more information, see the DCOU parameter of the Samcef damage interface material page.

Note:

If you specify a non-zero value for Fracture Toughness (GIIIc - GP), you must also specify a value for Shear Stiffness (K01).

Law choice

Law Option	Lets you choose between Polynomial, Bi-Triangular, Exponential, or ENS Cachan's Law law.

These options are available when you select Polynomial from the Law Option list.
Energy Threshold (Y0S)	Lets you specify the fiber versus matrix debonding threshold (mandatory).For more information, see the Y0S parameter of the Samcef damage interface material page.
Exponent (EXPN)	Lets you define the n plasticity law exponent (mandatory).For more information, see the EXPN parameter of the Samcef damage interface material page.

These options are available when you select ENS Cachan's Law from the Law Option list.
Energy Threshold (Y0S)	Lets you specify the fiber versus matrix debonding threshold (mandatory).For more information, see the Y0S parameter of the Samcef damage interface material page.
Exponent (EXPM)	Lets you define the m plasticity law exponent (mandatory).For more information, see the EXPM parameter of the Samcef damage interface material page.

This option is available when you select Bi-Triangular from the Law Option list.
Energy Threshold (Y0S)	Lets you specify the fiber versus matrix debonding threshold (mandatory).For more information, see the Y0S parameter of the Samcef damage interface material page.

Tangent matrix

The damage variables can be coupled by specific coefficients.

This option is available when you select Polynomial, Bi-Triangular, or Exponential from the Law Option list.
Tangent of Constitutive Law (TANG)	Lets you specify how the tangent to the σ versus ε curve is to be computed.Tangent or 0—Takes the tangent or 0 if negative.Secant—Takes the secant.Tangent—Takes the tangent.For more information, see the TANG parameter of the Samcef damage interface material page.

Time delay effect law

This option is available when you select Polynomial, Bi-Triangular, or Exponential from the Law Option list.
Time for Delay (TAU) Parameter for Delay (ADEL)	Lets you define the two parameters that drive the time delay effect law. If TAU is zero, there is no time delay effect.For more information, see the TAU and ADEL parameters of the Samcef damage interface material page.

Enhanced model

This option is available when you select Polynomial, Bi-Triangular, or Exponential from the Law Option list.
Crack Density Threshold (R01)	For more information, see the R01 parameter of the Samcef damage interface material page.
Interaction Coefficient (PHI)	For more information, see the PHI parameter of the Samcef damage interface material page.

How do I

Define a damage interface material in Simcenter Samcef or Multiphysics

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Damage Interface Material definition dialog box (Simcenter Samcef/Simcenter Nastran/Simcenter 3D Multiphysics), Simcenter 3D 2021.1 Series

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