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!ELEMENT_ACTIVATION

Definition of element activation/deactivation

Parameters

MODE      = control mode (FIXED, AMPLITUDE, DAMAGE) [required]
STATE     = element state (ON: active, OFF: inactive) (required when MODE=FIXED)
AMP       = amplitude name (required when MODE=AMPLITUDE)
MEASURE   = criterion quantity (STRESS, STRAIN) (required when MODE=DAMAGE)
EPSILON   = dummy stiffness coefficient (default: 1.0E-6)
GRPID     = control group ID

** 2nd line and later **

For MODE = FIXED, AMPLITUDE

ELEM_GRP_NAME

For MODE = DAMAGE

ELEM_GRP_NAME, LOWER, UPPER
Parameter Name Attribute Description
ELEM_GRP_NAME C Element group name
LOWER R Lower limit of stress/strain
UPPER R Upper limit of stress/strain

Example

!ELEMENT_ACTIVATION, MODE=FIXED, STATE=OFF, EPSILON=1.0E-3, GRPID=1
PART_1
!ELEMENT_ACTIVATION, MODE=AMPLITUDE, AMP=AMP1, EPSILON=1.0E-3, GRPID=2
PART_2
!ELEMENT_ACTIVATION, MODE=DAMAGE, MEASURE=STRESS, EPSILON=1.0E-6, GRPID=3
PART_3, 100.0, 200.0
!STEP, SUBSTEPS=10
BOUNDARY,1
LOAD,1
!STEP, SUBSTEPS=10
BOUNDARY,1
LOAD,1
ELEMACT,1
!STEP, SUBSTEPS=10
BOUNDARY,1
LOAD,1
ELEMACT,1
ELEMACT,2

Notes

  • Use MODE to specify the behavior exclusively (MODE=FIXED|AMPLITUDE|DAMAGE).
  • For MODE=FIXED, use STATE=ON/OFF to specify that elements are always active/inactive.
  • For MODE=AMPLITUDE, switch elements between active and inactive according to the amplitude value (active when amp_val > 0.5; inactive otherwise).
  • For MODE=DAMAGE, elements for which the quantity specified by MEASURE=STRESS|STRAIN falls outside the range (does not satisfy LOWER ≤ value ≤ UPPER) are deactivated. Once deactivated, they are not reactivated.
  • The control group specified by GRPID is enabled by ELEMACT, id within !STEP.
  • If ELEMACT, id is not specified within !STEP, the corresponding element-activation setting is not applied.