*CURE KINETICS

Define the reaction kinetics for cure modeling capabilities.

This option is used to define the reaction kinetics for cure modeling capabilities.

This page discusses:

See Also
In Other Guides
Curing Processes in Polymers

Products Abaqus/Standard

Type Model data

LevelModel

Required parameters

DEFINITION

Set DEFINITION=GRINDLING to define the degree of cure rate using the Grindling equation.

Set DEFINITION=KAMAL to define the degree of cure rate using the Kamal equation.

Set DEFINITION=TABULAR to define the degree of cure rate in tabular form.

Set DEFINITION=USER to define the degree of cure rate using user subroutine UCURE.

Optional parameters

DEPENDENCIES

This parameter is relevant only for DEFINITION=TABULAR.

Set this parameter equal to the number of field variable dependencies included in the definition of the degree of cure rate, in addition to temperature. If this parameter is omitted, the degree of cure rate does not depend on field variables.
PROPERTIES

This parameter is relevant only for DEFINITION=USER.

Set this parameter equal to the number of property values needed as data in user subroutine UCURE. The default is PROPERTIES=0.

Data lines to define the Grindling model coefficients

First line
  1. Grindling equation coefficient, A 1 . (Units of T-1.)
  2. Ratio of the activation energy to the universal gas constant, E 1 / R . (Units of θ .)
  3. Grindling equation exponent, n 1 .
  4. Grindling equation coefficient, A 2 . (Units of T-1.)
  5. Ratio of the activation energy to the universal gas constant, E 2 / R . (Units of θ .)
  6. Grindling equation exponent, n 2 .
  7. Grindling equation exponent, m .
  8. Grindling equation parameter, c 1 .
Second line
  1. Grindling equation parameter, c 2 . (Units of θ .)
  2. Diffusion-controlled reaction rate at the glass transition temperature, K D θ = θ g . (Units of T-1.)
  3. Grindling equation parameter, Δ θ g . (Units of θ .)

In addition, you must specify the value of absolute zero using the PHYSICAL CONSTANTS option and the glass transition temperature using the CURE GLASS TRANSITION TEMPERATURE option.

Data lines to define the Kamal model coefficients

First line

  1. Kamal equation coefficient, Z 1 . (Units of T-1.)

  2. Ratio of the activation energy to the universal gas constant, E 1 / R . (Units of θ .)

  3. Kamal equation exponent, m 1 .
  4. Kamal equation exponent, n 1 .
  5. Kamal equation parameter, b 1 .

In addition, you must specify the value of absolute zero using the PHYSICAL CONSTANTS option.

Repeat this data line as often as necessary to define the second, third, etc., terms in the Kamal equation. There is no restriction on the number of terms in the model.

Data lines to define the degree of cure rate in tabular form

First line
  1. Degree of cure rate, α ˙ . (Units of T-1.)
  2. Degree of cure, α .
  3. Temperature.
  4. First field variable.
  5. Second field variable.
  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.
  2. Etc., up to eight field variables per line.

Repeat this data line as often as necessary to define the degree of cure rate as a function of the degree of cure, temperature, and user-defined field variables.

Data lines to define the degree of cure rate in user subroutine UCURE

No data lines are needed if the PROPERTIES parameter is omitted or set to 0. Otherwise, first line
  1. Enter the values of the cure kinetics properties, eight per line.

Repeat this data line as often as necessary to define the material properties.