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SECTION EQUIVALENT SECTION PROPERTIES FOR SANDWICH PLATES. Sandwich Plates. Sandwich plates are made of a top and bottom facesheet with a core between, which are all glued together. This creates a plate that has a high bending stiffness for it’s weight.

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Section equivalent section properties for sandwich plates

SECTION

EQUIVALENT SECTION PROPERTIES FOR SANDWICH PLATES


Sandwich plates
Sandwich Plates

  • Sandwich plates are made of a top and bottom facesheet with a core between, which are all glued together.

  • This creates a plate that has a high bending stiffness for it’s weight.

  • The facesheets are usually thin plates of an isotropic material.

  • The core separates the facesheets and transmits shear loads between the facesheets but otherwise is usually considered to be structurally insignificant.


Pshell bulk data entry
PSHELL bulk data entry

  • The PSHELL’s T, 12I/T**3, and TS/T fields are adjusted to account for the equivalent section.

.bdf file extract

pshell, 1, 1, 0.1, 1, 15.0, 1, 0.55,,+

+, 0.27, -0.27


Nastran definitions of sandwich plates pshell
Nastran Definitions of Sandwich Plates - PSHELL

  • MID1, MID2, and MID3 all point to the same MAT1 isotropic material.

  • The T field on the PSHELL is set to the sum of the facesheet thicknesses (2*Tf).

  • The 12/T**3 field on the PSHELL is set to the ratio of the actual sandwich moment of inertia to the moment of inertia calculated from T on the PSHELL. In this case if the core moment of inertia is ignored:

  • An approximation for the effective shear thickness ,Ts/T, is TS/T=(5/6)*(Tc+2Tf)/T


Patran equivalent section definition
Patran Equivalent Section Definition

Materials:

Create/ Isotropic/ Manual Input

Enter Property Name

Select Equivalent Section Option

In Input Properties:

Click on existing materials in the Material Property Sets box to enter Membrane (MID1), Bending (MID2), Shear (MID3) Materials

Enter membrane Thickness (T)

Enter Bending Stiffness ratio (12/T**3)

Enter shear Thickness ratio (TS/T)

Enter Fiber Dist. 1 and 2 stress recovery points (Z1 and Z2)

OK

Select Application Region

Add

Apply