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From the Composite Layup editor, click the
Shell Parameters tab.
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Specify the Section Poisson's ratio to define the
shell thickness behavior:
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Toggle on Use analysis default to use the
default value. In
Abaqus/Standard
the default value is 0.5, which will enforce incompressible behavior of the
element for membrane strains. In
Abaqus/Explicit
the default is to base the change in thickness on the element material
definition.
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Toggle on Specify value, and enter a value
for the Poisson's ratio. This value must be between −1.0 and 0.5. A value of
0.0 will enforce constant shell thickness, and a negative value will result in
an increase in the shell thickness in response to tensile membrane strains.
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Toggle on Thickness modulus, and enter a value
for the thickness modulus. If you do not enter a value,
Abaqus
assumes the effective thickness modulus is twice the initial in-plane shear
modulus based on the material definition.
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If you are specifying properties for a composite layup integrated
during the analysis, select a method for defining the Temperature
variation through the section:
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Choose Linear through thickness to indicate
that the temperature at the reference surface and the temperature gradient or
gradients through the ply are specified. You can use the
Load module
to specify these temperatures.
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Choose Piecewise linear over
n values to enter the number of
temperature points (values) through the ply in the text field provided. You can
use the
Load module
to specify the temperature at each of these points.
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Toggle on Density, and enter a value for the
density. The mass of the ply includes a contribution from the density in
addition to any contribution from the selected material.
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For most continuum shell composite layups
Abaqus
calculates the transverse shear stiffness values required in the element
formulation. If desired, toggle on Specify values from the
Transverse Shear Stiffnesses options to include nondefault
transverse shear stiffness effects in the composite layup definition, and enter
values for ,
the shear stiffness in the first direction; ,
the coupling term in the shear stiffness; and ,
the shear stiffness in the second direction. If either value
or
is omitted or given as zero, the nonzero value will be used for both. For more
information, see
Defining the Transverse Shear Stiffness.
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