structure geogrid property
command
Syntax
- structure geogrid property keyword ... <range>
Primary keywords:
density thickness thermal-expansion anisotropic-membrane anisotropic-bending material-x isotropic orthotropic-membrane orthotropic-bending coupling-cohesion coupling-friction coupling-stiffness slide slide-tolerance
Assigns a property to elements in the range. The element can have isotropic, orthotropic, or anisotropic elastic material properties. The following properties are available:
- density f
density (needed if dynamic mode or gravity is active)
- thickness f
geogrid 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 [Eʹm] and [Eʹb], 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 [Eʹm] and [Eʹb], respectively, in the material directions x′, y′, z′.
- material-x v
specify the vector v whose projection onto the geogrid surface defines the x′-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 [Eʹm] and [Eʹb], 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 [Eʹm] and [Eʹb], respectively, in the material directions x′, y′, z′.
- coupling-cohesion f
coupling spring cohesion (stress units)
- coupling-friction f
coupling spring friction angle (degrees)
- coupling-stiffness f
coupling spring stiffness per unit area
- slide b
large-strain sliding flag
- slide-tolerance f
large-strain sliding tolerance
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 geogrid 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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