3D Connexion Version 6.6

*SECTION CONTROLS

Required parameter:

NAME

Set this parameter equal to a label that will be used to refer to the section control deﬁnition. All

section control names in the same input ﬁle must be unique.

Optional parameters:

DISTORTION CONTROL

This parameter applies only to ABAQUS/Explicit analyses.

Set DISTORTION CONTROL=YES to activate a constraint that acts to prevent negative

element volumes or other excessive distortion for crushable ma terials. This is the default value

for elements with hyperelastic or hyperfoam materials. The DISTORTION CONTROL parameter

is not relevant for linear kinematics and cannot prevent elements from being distorted due to

temporal instabilities, hourglass instabilities, or physically unrealis tic deformation.

Set DISTORTION CONTROL=NO to deactivate a constraint that acts to prevent negative

element volumes or other excessive distortion for crushable materials. This value is the default

except for elements with hyperelastic or hyperfoam materials.

ELEMENT DELETION

In ABAQUS/Explicit this parameter applies to all elements wi th progressive damage behavior

except connector elements. In ABAQUS/Standard this parameter applies to cohesive elements,

connector elements, and elements with plane stress formulations (plane stress, shell, continuum

shell, and membrane elements).

Set ELEMENT DELETION=YES to allow element deletionwhen the elem enthas com pletely

damaged. This value is the default for al le lements with a damage evolution model. How ever,this

value is not applicable to pore pressurecohesive elements.

Set ELEMENT DELETION=NO to allow fully damaged elements to remain in the

computations. The element retains a residual stiffness given by the speciﬁed value of MAX

DEGRADATION. In addition, elements with three-dimensional stress states (including

generalized plane strain elements) can sustainhydrostatic compressive stresses, and elements with

one-dimensional stress states can sustain compressive stresses. This value is the default for pore

pressure cohesive elements and is not availablefor beam elem ents.

HOURGLASS

Set HOURGLASS=COMBINED to deﬁne the viscous-stiffnessform of hourglass control for solid

and membrane elements with reduced integration in ABA QUS/Explicit.

Set HOURGLASS=ENHANCED (default for elements with hyperelastic and hyperfoam

materials in ABAQUS/Standard and ABAQUS/Explicit; default in ABAQUS/Standard and only

option in ABAQUS/Explicit for modiﬁed tetrahedral or triangula r elements) to deﬁne hourglass

control that is based on the assumed enhanced strain method for solid, membrane, ﬁnite-strain

shell elements with reduced integration and modiﬁed tetrahedral or triangular elements in

18.1–2

ABAQUS Version 6.1 Module: ID:

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