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SECTION EQUIVALENT SECTION PROPERTIES FOR SANDWICH PLATES

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

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  1. SECTION EQUIVALENT SECTION PROPERTIES FOR SANDWICH PLATES

  2. 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.

  3. 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

  4. 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

  5. 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

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