c. Click Apply d. Click the Show Label icon
a b
c
NAS121, Workshop , May 6, 2002
WS-7
Step 2. Use mesh seeds to define the mesh density
E11 20e6 E22 2e6 U12 .35
G12 1e6 G13 1e6 G23 1e6 Xt 120 ksi Xc 110 ksi Yt 13 ksi Yc 16 ksi S 14 ksi Sb 5 ksi
NAS121, Workshop , May 6, 2002
WS-4
Suggested Exercise Steps
name c. Click OK d. Choose Default Tolerance e. Select MSC.Nastran as the
Analysis Code f. Select Structural as the
Analysis Type g. Click OK
NAS121, Workshop , May 6, 2002
NAS121, Workshop , May 6, 2002
WS-5
CREATE NEW DATABASE
a
Create a new database called composite1.db:
a. In File select New b. Enter composite1 as the file

b
c
WS-6
d
e f g
Step 1. Create a geometry model
d
In Geometry create the first curve.
a. Select Create / Surface / Vertex
b. On the Surface Vertex “n” Lists enter [0 0 0], [1 0 0], [1 1 0], [0 1 0]
The angles shown are relative to the global axis shown.
Thus, the 0 degree ply 1 has it’s fibers coming out of the page in the Y direction.
Note that while the positive sense of the angles are right hand rule around the Z global axis in this layup definition, in the Nastran definition, it is around the Z element axis and thus dependent on the element GRID order.
a. Create a geometry model. b. Use mesh seeds to define the mesh density. c. Create a finite element mesh. d. Apply boundary conditions to the model. e. Apply loads to the model. f. Define ply material properties. g. Check element normals h. Define composite material properties. i. Define a material coordinate system j. Apply the material coordinate system to the elements. k. Submit the model to MSC.Nastran for analysis. l. Attach xdb Results File m. Display ply stresses using MSC.Patran. n. View ply failure indices in MSC.Nastran o. Change layup to make failure indices below 1.0. p. Analyze the model with the new composite layup q. View the changed ply failure indices
The left side reacts the loads with X, Y, Z, and Ry constraints.
NAS121, Workshop , May 6, 2002
WS-2
Problem Description
The layup is made of graphite/epoxy tape and is shown to the right.
WORKSHOP Define a Composite Material
NAS121, Workshop , May 6, 2019
WS-1
Problem Description
A 1 in. x 1 in. composite plate is loaded with 2000 #/in. in the Y direction on the top edge, 1000 #/in. in both the X direction and Y direction on the right hand side edge.
NAS121, Workshop , May 6, 2002
WS-3
Problem Description (cont.)
The composite plies are graphite/epoxy tape with a thickness of 0.0054 in. The elastic and strength properties are shown on the right. The failure theorem to be used is Hill.