`structure liner list`

command

Syntax

- structure liner list keyword <range>
Primary keywords:

apply coupling-normal coupling-shear depth-factor element-type force-node group information model plastic-state plastic-stress property resultants stress stress-bounds stress-principal system-local system-material

List properties and responses of liner elements in the range. If no keyword is given, the default output of the command is that associated with the

`information`

keyword.- apply
uniform applied pressure acting on the element

- coupling-normal
information about the normal coupling springs connecting the liner to the target object (zones in FLAC3D and 3DEC, and particles in PFC3D): normal displacement, stress, and normal direction. Normal displacement positive/negative implies separation/overlap; normal stress positive/negative implies tension/compression; and normal direction is given as a unit vector in the global system.

- coupling-shear
information about the shear coupling springs connecting the liner to the target object (zones in FLAC3D and 3DEC, and particles in PFC3D): shear displacement, stress, yield state and shear direction. Shear displacement and stress are always positive and act in the liner tangent plane; and shear direction is given as a unit vector in the global system.

- depth-factor
depth factor used during stress recovery for elements with an elastic material model

- element-type
finite element type

- force-node <keyword>
generalized nodal forces (force and moment) acting on the element. These are the generalized forces exerted by the nodes on the element.

- local
express the values in the element coordinate system (the default)

- global
express the values in the global coordinate system

- group <slot s >
group assignment(s). If slot is specified, then list the group assignment, if any, in slot s.

- information
general element information: nodal connectivity, centroid, surface area, volume, and hide/select status

- model
constitutive model

- plastic-state <integration-point ind >
Plasticity state indicators. Each shell element with a plastic material model has a number of integration points distributed throughout its volume, and each of them tracks its plasticity state. The plasticity states at all integration points are listed, unless integration-point is specified. The integration point locations are shown here. The plasticity states of the plastic constitutive models can be listed by the

`structure liner cmodel list states`

command.

- plastic-stress <surface> <integration-point ind >
Stress for elements with a plastic material model. Each shell element with a plastic material model has a number of integration points distributed throughout its volume, and each of them tracks its stress. The stress state satisfies the plane-stress assumption such that the only non-zero components are \(\sigma_{xx}\), \(\sigma_{yy}\) and \(\sigma_{xy}\). The stress is expressed in the element coordinate system, unless surface is specified, in which case the stress is expressed in the surface coordinate system (which must already be established for the shell element — see the

`structure liner recover surface`

command). The stresses at all integration points are listed, unless integration-point is specified. The integration point locations are shown here.

- property <integration-point ind > keyword
The properties consist of constitutive model properties, shell-type properties, and coupling-spring properties. The constitutive model properties are listed by specifying the constitutive property name; these names are not listed here. Elastic-plastic constitutive model properties are stored at each integration point. Such properties are the same at all integration points, except for the softening properties of the strain-softening/hardening Mohr Coulomb constitutive model. The value at a particular integration point is listed by specifying the integration-point keyword — the integration point layout is shown here.

Shell-Type Properties

- density
mass density

- thermal-expansion
thermal-expansion coefficient

- thickness
shell thickness

Coupling-Spring Properties

- coupling-cohesion-shear
shear coupling spring cohesion (stress units)

- coupling-cohesion-shear-2
shear coupling spring cohesion (stress units) on side 2

- coupling-cohesion-shear-residual
shear coupling spring residual cohesion (stress units)

- coupling-cohesion-shear-residual-2
shear coupling spring residual cohesion (stress units) on side 2

- coupling-friction-shear
shear coupling spring friction angle (degrees)

- coupling-friction-shear-2
shear coupling spring friction angle (degrees) on side 2

- coupling-stiffness-normal
coupling spring normal stiffness per unit area

- coupling-stiffness-normal-2
coupling spring normal stiffness per unit area on side 2

- coupling-stiffness-shear
coupling spring shear stiffness per unit area

- coupling-stiffness-shear-2
coupling spring shear stiffness per unit area on side 2

- coupling-yield-normal
normal coupling spring tensile strength (stress units)

- coupling-yield-normal-2
normal coupling spring tensile strength (stress units) on side 2

- effective
effective stress flag (default to on). If off, then pore pressures are not removed from the stress normal to the liner when determining shear failure limits.

- slide
large-strain sliding flag

- slide-tolerance
large-strain sliding tolerance

- resultants <nodes>
stress resultants expressed in the surface coordinate system. By default, the values are given at the element centroid; however, if nodes is specified, then the values are given at the element nodes. The stress resultants are recovered by the

`structure liner recover resultants`

command.

- stress <nodes>
stresses at the indicated depth expressed in the global coordinate system for elements with an elastic material model. By default, the values are given at the element centroid; however, if nodes is specified, then the values are given at the element nodes. The stresses are recovered by the

`structure liner recover stress`

command.

- stress-bounds
minimum and maximum stress within the element. If the element has an elastic material model, then uses the 2D principal stresses at the element centroid at the shell surfaces (obtained from the nodal forces acting on the element, and with no nodal smoothing). If the element has a plastic material model, then the 2D principal stresses are found at the element centroid of each integration-point layer, and the minimum and maximum values over all layers are listed.

- stress-principal <nodes>
principal stresses at the indicated depth expressed in the global coordinate system for elements with an elastic material model. By default, the values are given at the element centroid; however, if nodes is specified, then the values are given at the element nodes. The stresses are recovered by the

`structure liner recover stress`

command.

- system-local
element local coordinate system

- system-material
element material coordinate system (used if the element has orthotropic or anisotropic elastic material properties)

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