structure liner property command
Syntax
- structure liner property keyword
Primary keywords:
density thickness thermal-expansion anisotropic-membrane anisotropic-bending anisotropic-both material-x isotropic orthotropic-membrane orthotropic-bending orthotropic-both slide slide-tolerance coupling-yield-normal coupling-yield-normal-2 coupling-stiffness-normal coupling-stiffness-normal-2 coupling-stiffness-shear coupling-stiffness-shear-2 coupling-cohesion-shear coupling-cohesion-shear-2 coupling-cohesion-shear-residual coupling-cohesion-shear-residual-2 coupling-friction-shear coupling-friction-shear-2 effective
Assigns a property to elements in the range. The element can have isotropic, orthotropic, or anisotropic elastic material properties. Note that if the liner is embedded, then coupling spring properties must be entered separately on side 2. The following properties are available:
- density f
density (needed if dynamic mode or gravity is active)
- thickness f
liner thickness
- thermal-expansion f
thermal expansion coefficient
- anisotropic-membrane f1 f2 f3 f4 f5 f6
anisotropic membrane material properties {c’11, c’12, c’13, c’22, c’23, c’33} [F/L2], which define membrane material-stiffness matrices [E’m] and [E’b], respectively, in the material directions x’, y’, z’
- anisotropic-bending f1 f2 f3 f4 f5 f6
anisotropic bending material properties {c’11, c’12, c’13, c’22, c’23, c’33} [F/L2], which define bending material-stiffness matrices [E’m] and [E’b], respectively, in the material directions x’, y’, z’
- anisotropic-both f1 f2 f3 f4 f5 f6
anisotropic membrane and bending material properties {c’11, c’12, c’13, c’22, c’23, c’33} [F/L2], which define membrane and bending material-stiffness matrices [E’m] and [E’b], respectively, in the material directions x’, y’, z’
- material-x v
specify the vector v whose projection onto the geogrid surface defines the xʹ-axis of the material coordinate system. The material directions correspond with the principal directions of orthotropy (for more information, see below).
- isotropic f1 f2
isotropic material properties: E and v where E is Young’s modulus [F/L2] and v is Poisson’s ratio
- orthotropic-membrane f1 f2 f3 f4
orthotropic membrane material properties { c’11, c’12, c’22, c’33 } [F/L2], which define membrane material-stiffness matrices [ E’m ] and [ E’b ], respectively, in the material directions x’, y’, z’.
- orthotropic-bending f1 f2 f3 f4
orthotropic bending material properties { c’11, c’12, c’22, c’33 } [F/L2], which define bending material-stiffness matrices [ E’m ] and [ E’b ], respectively, in the material directions x’, y’, z’.
- orthotropic-both f1 f2 f3 f4
orthotropic membrane and bending material properties { c’11, c’12, c’22, c’33 } [F/L2], which define membrane and bending material-stiffness matrices [ E’m ] and [ E’b ], respectively, in the material directions x’, y’, z’.
- slide b
large-strain sliding flag
- slide-tolerance f
large-strain sliding tolerance
- coupling-yield-normal f
normal coupling spring tensile strength (stress units)
- coupling-yield-normal-2 f
normal coupling spring tensile strength on side 2 (stress units)
- coupling-stiffness-normal f
normal coupling spring stiffness per unit area
- coupling-stiffness-normal-2 f
normal coupling spring stiffness per unit area on side 2
- coupling-stiffness-shear f
shear coupling spring stiffness per unit area
- coupling-stiffness-shear-2 f
shear coupling spring stiffness per unit area on side 2
- coupling-cohesion-shear f
shear coupling spring cohesion (stress unit)
- coupling-cohesion-shear-2 f
shear coupling spring cohesion (stress unit) on side 2
- coupling-cohesion-shear-residual f
shear coupling spring residual cohesion
- coupling-cohesion-shear-residual-2 f
shear coupling spring residual cohesion on side 2
- coupling-friction-shear f
shear coupling spring friction angle (degrees)
- coupling-friction-shear-2 f
shear coupling spring friction angle (degrees) on side 2
- effective b
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.
Further information on the material-x keyword
The material coordinate system, xʹ, yʹ, zʹ, defines the orthotropic and anisotropic properties and satisfies the following conditions: 1) xʹ is the projection of the given vector onto the surface; 2) zʹ is normal to the surface and aligned with the z-axis of the shell-type element coordinate system; and 3) yʹ = zʹ × xʹ. The material coordinate system moves with the shell surface during large-strain updates, which means that the relative orientations of this system and the element local system do not change (the angle β in this figure does not change). If the material x-vector is not specified, then the xʹ-axis will be aligned with the x-axis of the structural element local coordinate system.
The material coordinate system can be queried with the command
structure liner list property material-x
and the FISH functionstruct.shell.beta
. It can be visualized with the structural geometry plot item by choosing the corresponding System attribute.
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