Elastic lecture

7/14/2019 Elastic lecture

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3/12/2014 Abaqus Keywords Reference Guide (6.13)

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*ELASTIC

Specify elastic material properties.

This option is used to define linear elastic moduli. In an Abaqus/Standard analysis spatially varying isotropic,

orthotropic (including engineering constants and lamina), or anisotropic linear elastic moduli can be defined for

solid continuum elements using a distribution (Distribution definition, Section 2.8.1 of the Abaqus Analysis

User's Guide).

Products: Abaqus/Standard Abaqus/Explicit Abaqus/CAE

Type: Model data

Level: Model

Abaqus/CAE: Property module

Reference:

Linear elastic behavior, Section 22.2.1 of the Abaqus Analysis User's Guide

Optional parameters:

DEPENDENCIES

Set this parameter equal to the number of field variable dependencies included in the definition of the

moduli. If this parameter is omitted, it is assumed that the moduli are constant or depend only on

temperature. See Specifying field variable dependence in Material data definition, Section 21.1.2 of

the Abaqus Analysis User's Guide, for more information.

Thisparameter is not relevant in an Abaqus/Standard analysis if spatially varying elastic moduli are defined

using a distribution. See Distribution definition, Section 2.8.1 of the Abaqus Analysis User's Guide.

MODULI

This parameter is applicable only when the *ELASTICoption is used in conjunction with the

*VISCOELASTICoption.

Set MODULI=INSTANTANEOUS to indicate that the elastic material constants define the

instantaneous behavior. This parameter value is not available for frequency domain viscoelasticity in anAbaqus/Standard analysis.

Set MODULI=LONG TERM (default) to indicate that the elastic material constants define the long-term

behavior.

TYPE

Set TYPE=ANISOTROPIC to define fully anisotropic behavior.

Set TYPE=COUPLED TRACTION to define coupled traction behavior for cohesive elements.

Set TYPE=ENGINEERING CONSTANTS to define orthotropic behavior by giving the engineering

constants (the generalized Young's moduli, the Poisson's ratios, and the shear moduli in the principal

directions).
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Set TYPE=ISOTROPIC (default) to define isotropic behavior.

Set TYPE=LAMINA to define an orthotropic material in plane stress.

Set TYPE=ORTHOTROPIC to define orthotropic behavior by giving the elastic stiffness matrix directly.

Set TYPE=SHEAR to define the (isotropic) shear elastic modulus. This parameter setting is applicable

only in conjunction with the *EOSoption in Abaqus/Explicit.

Set TYPE=SHORT FIBER to define laminate material properties for each layer in each shell element.

This parameter setting is applicable only when using Abaqus/Standard in conjunction with the Abaqus

Interface for Moldflow. Any data lines given will be ignored. Material properties will be read from the

ASCII neutral file identified asjobid.shf. See the Abaqus Interface for Moldflow User's Guidefor

more information.

Set TYPE=TRACTION to define orthotropic shear behavior for warping elements or uncoupled traction

behavior for cohesive elements.

When using a distribution to define elastic moduli, the TYPE parameter must be used to indicate the level

of anisotropy in the elastic behavior. The level of anisotropy must be consistent with that defined in the

distribution. See Distribution definition, Section 2.8.1 of the Abaqus Analysis User's Guide.

Data lines to define fully anisotropic elasticity directly (TYPE=ANISOTROPIC):

First line:

1. . (Units of FL2.)

2. .

3. .

4. .

5. .

6. .

7. .

8. .

Second line:

1. .

2. .

3. .

4. .

5. .
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6. .

7. .

8. .

Third line:

1. .

2. .

3. .

4. .

5. .

6. Temperature.

7. First field variable.

8. Second field variable.

Subsequent lines (only needed if the DEPENDENCIES parameter has a value greater than two):

1. Third field variable.

2. Etc., up to eight field variables per line.

Repeat this set of data lines as often as necessary to define the elastic behavior as a function of temperature

and other predefined field variables.

Data lines to define coupled traction separation behavior for cohesive elements (TYPE=COUPLED

TRACTION):

First line:

1. .

2. .

3. .

4. .

5. .

6. .

7. Temperature.



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Subsequent lines (only needed if the DEPENDENCIES parameter has a value greater than one):





Data lines to define orthotropic elasticity with moduli (TYPE=ENGINEERING CONSTANTS):

First line:

1. .

2. .

3. .

4. .

5. .

6. .

7. .

8. .

Second line:

1. .

2. Temperature, .



5. Etc., up to six field variables.

Subsequent lines (only needed if the DEPENDENCIES parameter has a value greater than six):

1. Seventh field variable.




Data lines to define isotropic elasticity (TYPE=ISOTROPIC):

First line:


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1. Young's modulus, E.

2. Poisson's ratio, .

3. Temperature, .



6. Etc., up to five field variables.

Subsequent lines (only needed if the DEPENDENCIES parameter has a value greater than five):

1. Sixth field variable.


Repeat this set of data lines as often as necessary to define the elastic behavior as a function of temperatureand other predefined field variables.

Data lines to define orthotropic elasticity in plane stress (TYPE=LAMINA):

First line:

1. .

2. .

3. .

4. .

5. . This shear modulus is needed to define transverse shear behavior in shells.

6. . This shear modulus is needed to define transverse shear behavior in shells.

7. Temperature.


Subsequent lines (only needed if the DEPENDENCIES parameter has a value greater than one):





Data lines to define orthotropic elasticity directly (TYPE=ORTHOTROPIC):

First line:


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1. . (Units of FL2.)

2. .

3. .

4. .

5. .

6. .

7. .

8. .

Second line:

1. .

2. Temperature.









Data lines to define isotropic elastic shear behavior (TYPE=SHEAR):

First line:

1. Shear modulus, G. (Units of FL2.)

2. Temperature.




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Repeat this set of data lines as often as necessary to define the elastic shear modulus as a function of

temperature and other predefined field variables.

Data lines to define orthotropic shear behavior for warping elements or uncoupled traction behavior

for cohesive elements (TYPE=TRACTION):

First line (only line for defining orthotropic shear behavior for warping elements; in this case the

data cannot be defined as functions of temperature and/or field variables):

1. Efor warping elements; for cohesive elements.

2. for warping elements; for cohesive elements.

3. for warping elements; for cohesive elements.

4. Temperature.


6. Etc., up to four field variables per line.

Subsequent lines (only needed if the DEPENDENCIES parameter has a value greater than four;

relevant only for defining uncoupled traction behavior of cohesive elements):

1. Fifth field variable.




Data line to define spatially varying elastic behavior for solid continuum elements in an

Abaqus/Standard analysis using a distribution. (Distributions are supported for TYPE=ISOTROPIC,

TYPE=ENGINEERING CONSTANTS, TYPE=LAMINA, TYPE=ORTHOTROPIC, and

TYPE=ANISOTROPIC):

First line:

1. Distribution name. The data defined in the distribution must be in units that are consistent with the

prescribed TYPE.

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