NX Laminates 1

[eagle182]

Using NX7, and my question is about locating and specifying laminate properties. I am new to NX, but not to CAD and I have sifted through the documentation plenty.

When defining a woven laminate ply material, NX makes you specify the warp and weft independently as two different materials. What is the standard method for inputing the elastic constants (E,G,v)? Creating two isotropic materials to represent the warp and weft directional properties?

Also, where are mechanical properties (elastic constants) for commercial materials, such as plain weave fiberglass, found? Do you have to get this from the yarn properties?

Thanks!

 

[louis1m]

You should define the fiber and matrix materials. The software then computes the warp and weft properties of the resulting woven fabric.

 

[eagle182]

But under Ply Materials ("Laminate Ply Material Manager")>Create Woven ply, you get the dialog in the picture.

My method is to input for warp and weft each half the density you get considering the raw fabric thickness and area density, such as 5oz/yd^2. The balance coefficient k, I assume, is given by warp/(warp+weft).

 

[louis1m]

I misunderstood your question. Let me try again

The warp and weft fiber materials are not necessarily different, but they can be. The warp fiber material is an orthotropic material defining the 0 and 90 degree properties of the warp material. The weft fiber material is an orthotropic material defining the 0 and 90 degree properties of the weft material: Note that the 0 degree properties of the weft material are clocked from the 0 degree of the Warp by the Weft Fiber Angle.

You are right about the balance coefficient.

You typically get fiber and matrix properties from a pre-preg supplier.

 

[eagle182]

So I am still uncertain about how the program accounts for density of different cloths.

For a woven material, you can specify density of the fiber and matrix, but how does it "capture" the weight value that is traditionally given in oz/yd^2 for the cloth alone?

 

[louis1m]

In your case, I believe that you should point to the same material for warp and weft, and the material should have the correct, raw fabric density.