*ALLOWABLE STRESS

Specify the allowable stress of a composite at the initiation of damage in a multiscale material.

This option is used to specify the allowable stress of a composite at the initiation of damage in a multiscale material.

This option can be used only in conjunction with the MEAN FIELD HOMOGENIZATION option.

This page discusses:

See Also
In Other Guides
About Damage and Failure for Fiber-Reinforced Composites Using Multiscale Modeling

Products Abaqus/Standard

Type Model data

LevelModel

Required parameters

DEPENDENCIES

Set this parameter equal to the number of field variables included in the definition of the allowable stress. If this parameter is omitted, it is assumed that the allowable stresses are constant or depend only on temperature.

TYPE

Set TYPE=UD to specify allowable stress for a unidirectional fiber-reinforced composite.

Set TYPE=WOVEN to specify allowable stress for a plain weave composite.

Data lines to specify allowable stress for TYPE=UD

First line
  1. Longitudinal tensile strength of the lamina.

  2. Longitudinal compressive strength of the lamina.

  3. Transverse tensile strength of the lamina.

  4. Transverse compressive strength of the lamina.

  5. Longitudinal shear strength of the lamina.

  6. Transverse shear strength of the lamina.

  7. Temperature, if temperature dependent.

  8. First field variable.

Subsequent lines (only needed if the DEPENDENCIES parameter has a value greater than one)
  1. Second field variable.

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

Repeat this set of data lines as often as necessary to define the dependence of the strengths on temperature and other predefined field variables.

Data lines to specify allowable stress for TYPE=WOVEN

First line
  1. Tensile strength of the lamina along the 1-direction.

  2. Compressive strength of the lamina along the 1-direction.

  3. Longitudinal shear strength of the lamina.

  4. Tensile stress of the lamina along the 1-direction at the initiation of the matrix failure.

  5. Compressive stress of the lamina along the 1-direction at the initiation of the matrix failure.

  6. Longitudinal shear stress of the lamina at the initiation of the matrix failure.

  7. Temperature, if temperature dependent.

  8. First field variable.

Subsequent lines (only needed if the DEPENDENCIES parameter has a value greater than one)
  1. Second field variable.

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

Repeat this set of data lines as often as necessary to define the dependence of the strengths on temperature and other predefined field variables.