Creating a composite laminate with dropped layer

Files required:

Windows:composite_tutorial.zip

Linux:Unzip Tutor.zip. File Path:Tutor->TutorFiles->composite_tutorial.zip

Case description:

  • In this tutorial, you will learn how to model composite for shell-like structures which are built up by layers of fiber oriented plies, a so called composite laminate.
  • Each layer (also referred to as a ply) can have its own physical properties, such as material data, thickness and material/fiber direction. Each layer/ply has a direct correlation to through-thickness integration point in the LS-DYNA shell element.

The composite layup:

There will be two or three plies in different areas of the structure. Looking at a cut of the symmetry line, the layers looks like this.

 

 

 

 

 

 

The top image shows a schematic image of the "physical" layup. It is shown that the mid ply is only present in the circular area of the part, see Figure 1. The top layer is a physically continous ply. The yellow area will be filled with resin.

 

The bottom image shows how we will model the structure with FE.

 

The red, green and blue areas represent the three plies. Note that even though the top layer is the second layer from the bottom on the right hand side, it will still be modelled as layer number three in the FE model. This is important as it will simplify the post-processing knowing that results from integration point number three in the d3plot database represents a physical layer, in this case the top layer.

 

 

The composite material orientation:

The fiber/material directions will be oriented circular around the "hole" for the mid layer, whereas it will follow the "natural" lines around the "hole" for the top and bottom layer, see Figure 3 below.