Materials Form

Abaqus > Building A Model > Materials Form

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Materials Form

The Materials form shown below provides the following options for the purpose of creating
ABAQUS materials.

Change Material Status

The approach to defining material properties in Patran is similar to that in ABAQUS; the complete material model is defined by individually defining the necessary constitutive models. For example, to define a material for a plasticity analysis, one would first define the elastic properties and select Apply. Then the plastic properties are defined by selecting Plastic as Option 1, the yield criteria as Option 2, the hardening law as Option 3, entering the appropriate data and pushing Apply.

Not all constitutive model options are valid for a particular material in a particular ABAQUS analysis. For example, it is not permissible to have both elastic and hyperelastic properties defined for the same ABAQUS material. Patran, however, allows these different constitutive models to be defined and then “deactivated” for a given ABAQUS analysis. This is done on the form displayed when the Change Material Status button is selected on the main Materials form. For example, if a user defines both Elastic and Hyperelastic properties for a given material, one of these constitutive options must be deactivated on the Change Material Status form before initiating the ABAQUS analysis.

Temperature Dependence

ABAQUS allows most material properties to be functions of temperature. The ABAQUS interface in Patran generally supports this as well. The first step in defining a temperature dependent material property is to define a temperature dependent material field in the Fields application. This field can then be selected from a listbox on the Materials, Input Options form. When the databox for a material property that may be temperature dependent is selected, the fields listbox appears.

The following table shows the allowable selections for all options when the Action is set to Create and the Analysis Type in the Analysis Preference form is set to Structural. The various options have different names, depending on previous selections.


Object	Option 1	Option 2	Option 3
Isotropic	• Elastic	Material Failure Theory
	Hyperelastic	Incompressible	Test Data • Ogden • Polynomial Coefficients • Ogden • Mooney Rivlin • Neo Hookean • Polynomial



		Slightly Compressible	Test Data • Ogden • Polynomial Coefficients • Ogden • Polynomial




		Compressible	Test Data • Ogden Coefficients • Ogden



	Viscoelastic	Frequency	• Formula • Tabular
		Time	• Prony • Creep Test Data • Combined Creep Test Data • Relaxation Test Data • Combined Relax Test Data



	• Deformation Plasticity
	Plastic	Mises/Hill	• Perfect Plasticity • Isotropic • Kinematic


		• Drucker-Prager	Compression Tension Shear


		Modified D-Prager/Cap	Cap Hardening
	Creep	• Time • Strain • Hyperbolic
2D Orthotropic (Lamina)	• Elastic	Material Failure Theory
	Viscoelastic	Frequency	• Formula Tabular
		Time	• Prony • Creep Test DataCombined Creep Test Data • Relaxation Test DataCombined Relax Test Data
	Plastic	Mises/Hill	• Perfect Plasticity • Isotropic • Kinematic
		• Drucker-Prager	Compression Tension Shear
		Modified D-Prager/Cap	Cap Hardening
	Creep	• Time • Strain • Hyperbolic
3D Orthotropic	• Elastic	Engineering Constants • [D] Matrix	Material Failure Theory
	Viscoelastic	Frequency	• FormulaTabular
		Time	• Prony • Creep Test DataCombined Creep Test Data • Relaxation Test DataCombined Relax Test Data
	Plastic	Mises/Hill	• Perfect Plasticity • Isotropic • Kinematic
		• Drucker-Prager	Compression Tension Shear
		Modified D-Prager/Cap	Cap Hardening
	Creep	• Time • Strain • Hyperbolic
3D Anisotropic	• Elastic	[D] Matrix	Material Failure Theory
	Viscoelastic	Frequency	• FormulaTabular
	Viscoelastic	Time	• Prony • Creep Test DataCombined Creep Test Data • Relaxation Test DataCombined Relax Test Data
	Plastic	Mises/Hill	• Perfect Plasticity • Isotropic • Kinematic
		• Drucker-Prager	Compression Tension Shear


		Modified D-Prager/Cap	Cap Hardening
	Creep	• Time • Strain • Hyperbolic
Composite	• Laminate Rule of Mixtures HAL Cont. Fiber HAL Disc. Fiber HAL Cont. Ribbon HAL Disc. Ribbon HAL Particulate Short Fiber 1D Short Fiber 2D

The following table shows the allowable selections for all options when the Action is set to Create and the Analysis Type is set to Thermal in the Analysis Preference form. The various options have different names, depending on previous selections.


Object	Option 1
Isotropic	Thermal
3D Orthotropic	Thermal
3D Anisotropic
Composite	Laminate Rule of Mixtures HAL Cont. Fiber HAL Disc. Fiber HAL Cont. Ribbon HAL Disc. Ribbon HAL Particulate Short Fiber 1D Short Fiber 2D

Isotropic

Elastic


Object	Option 1	Option 2
Isotropic	Elastic	Material Failure Theory

More data input is available for defining the Elastic properties for the Isotropic materials. Listed below are the descriptions for the remaining material properties.


Property Name	Description
Reference Temperature	This is the reference value of temperature for the coefficient of thermal expansion. The thermal strain in the material is based on the difference between the current temperature and this reference value (default is 0.0).
Thermal Expansion Coeff	Coefficient of thermal expansion for the isotropic material.
Fraction Critical Damping	Set this parameter equal to the fraction of critical damping to be used with this material in calculating composite damping factors for the modes (for use in modal dynamics). The default is 0.0. The value is ignored in direct integration dynamics.
Mass Propornl Damping	Factor for mass proportional damping in direct integration dynamics (default = 0.0). This value is ignored in modal dynamics.
Stiffness Propornl Damping	Factor for stiffness proportional damping in direct integration dynamics (default = 0.0). This value is ignored in modal dynamics.

Hyperelastic


Object	Option 1	Option 2	Option 3
Isotropic	Hyperelastic	Incompressible	Test Data - Ogden Polynomial

Hyperelastic


Object	Option 1	Option 2	Option 3
Isotropic	Hyperelastic	Incompressible	Coefficients - Ogden

Hyperelastic


Object	Option 1	Option 2	Option 3
Isotropic	Hyperelastic	Incompressible	Coefficients - Moony Rivlin Neo Hookean Polynomial

Hyperelastic


Object	Option 1	Option 2	Option 3
Isotropic	Hyperelastic	Slightly Compressible	Test Data - Ogden Polynomial

Hyperelastic


Object	Option 1	Option 2	Option 3
Isotropic	Hyperelastic	Slightly Compressible	Coefficients - Ogden

Hyperelastic


Object	Option 1	Option 2	Option 3
Isotropic	Hyperelastic	Slightly Compressible	Coefficients - Polynomial

Hyperelastic


Object	Option 1	Option 2	Option 3
Isotropic	Hyperelastic	Compressible	Test Data - Ogden

More data input is available for defining the Hyperelastic properties. Listed below are the descriptions for the remaining material properties.


Property Name	Description
Volumetric Pressure	Material field defining volume ratio (current volume/original volume) as a function of pressure. This field appears on the *VOLUMETRIC TEST DATA sub option.
Poisson’s Ratio	Effective Poisson’s ratio of the material which will be equal to all . This is the value of the POISSON parameter on the *HYPERFOAM option. If no value is given, the lateral strains should be entered.
Density	Defines the material mass density. This quantity appears on the *DENSITY option.
Thermal Expansion Coeff	Coefficient of thermal expansion for the isotropic material. This parameter appears as a on the *EXPANSION option.

Hyperelastic


Object	Option 1	Option 2	Option 3
Isotropic	Hyperelastic	Compressible	Coefficients - Ogden

Viscoelastic


Object	Option 1	Option 2	Option 3
Isotropic, 2D Orthotropic, 3D Orthotropic or 3D Anisotropic	Viscoelastic	Frequency	Tabular Formula

Viscoelastic


Object	Option 1	Option 2	Option 3
Isotropic, 2D Orthotropic, 3D Orthotropic or 3D Anisotropic	Viscoelastic	Time	Prony

Viscoelastic


Object	Option 1	Option 2	Option 3
Isotropic, 2D Orthotropic, 3D Orthotropic or 3D Anisotropic	Viscoelastic	Time	Creep Test Data Combined Creep Test Data

Viscoelastic


Object	Option 1	Option 2	Option 3
Isotropic, 2D Orthotropic, 3D Orthotropic or 3D Anisotropic	Viscoelastic	Time	Relaxation Test Data Combined Relax Test Data

Deformation Plasticity


Object	Option 1
Isotropic	Deformation Plasticity

Plastic


Object	Option 1	Option 2	Option 3
Isotropic, 2D Orthotropic, 3D Orthotropic or 3D Anisotropic	Plastic	Mises/Hill	Perfect Plasticity

Plastic


Object	Option 1	Option 2	Option 3
Isotropic, 2DOrthotropic, 3DOrthotropic or 3D Anisotropic	Plastic	Mises/Hill	Isotropic

Plastic


Object	Option 1	Option 2	Option 3
Isotropic, 2D Orthotropic, 3DOrthotropic or 3D Anisotropic	Plastic	Mises/Hill	Kinematic

Plastic


Object	Option 1	Option 2	Option 3
Isotropic, 2D Orthotropic, 3D Orthotropic or 3D Anisotropic	Plastic	Drucker-Prager	Compression Tension Shear

Plastic


Object	Option 1	Option 2	Option 3
Isotropic, 2D Orthotropic, 3D Orthotropic or 3D Anisotropic	Plastic	Modified D-Prager/Cap	Cap Hardening

Creep


Object	Option 1	Option 2
Isotropic, 2D Orthotropic, 3D Orthotropic or 3D Anisotropic	Creep	Time Strain

Creep


Object	Option 1	Option 2
Isotropic, 2D Orthotropic, 3D Orthotropic or 3D Anisotropic	Creep	Hyperbolic

2D Orthotropic (Lamina)

Elastic


Option 1	Option 2
Elastic	Material Failure Theory

3D Orthotropic

Elastic


Option 1	Option 2	Option 3
Elastic	Engineering Constants	Material Failure Theory

Elastic


Object	Option 1	Option 2	Option 3
3D Orthotropic	Elastic	[D] Matrix	Material Failure Theory

3D Anisotropic

Elastic


Option 1	Option 2
Elastic	[D] Matrix

More data input is available for defining the Elastic properties for the 3D Anisotropic materials. Listed below are the descriptions for the remaining material properties.


Property Name	Desciption
D1212 (C34) D1212 (C44) D1113 (C15) D2213 (C25) D3313 (C35) D1213 (C45) D1313 (C55) D1123 (C16) D2223 (C26) D3323 (C36) D1223 (C46) D1323 (C56) D2323 (C66)	Coefficients in the 6 x 6 stress-strain matrix for the 3D anisotropic material.
Density	Defines the material mass density.

Isotropic (Thermal)

3D Orthotropic (Thermal)

3D Anisotropic (Thermal)

Composite

The Composite forms allow existing materials to be combined to create new materials. All of the composite materials, with the exception of the laminated composites, can be assigned to elements like any homogeneous material through the element property forms. For the laminated composites, the section thickness is entered indirectly through the definition of the stack, and the Homogeneous option on the Element Properties Form for shells, plates and beam must be changed to Laminate to avoid reentry of this information.

For details on how to use these forms, refer to the Composite Materials Construction (p. 110) in the Patran Reference Manual.

Laminate