🧭 CAE Compass

Edition # 24

In the previous edition, we explored what are composite materials and their applications.

This time we will look at the basic structure of composites, how they are modeled in CAE and some resources for further learning.

Let’s go back to the definition!

A composite material is simply two different materials combined to make something better. When you mix them, you get a material that’s extra strong, super light and even resistant to electricity!

They’re used instead of traditional materials because they boost the qualities of their base ingredients.

Researchers have gone a step further by adding sensors, actuators and even communication abilities into composites to create “Robotic materials.”

But the real concern for common people like us is: how on earth do we simulate such material in CAE?

The material modeling for composites is complex and challenging due to its layered, matrix nature.

Its main components include:

• Core material​
  Honeycomb, wood, PU, PVC, PS, ...
• Matrix​
  This is the bonding material between different layers. The matrix material is generally a resin.
• Reinforcement fibres​
  Responsible for the anisotropic (i.e. direction dependent) properties and the largest stiffness of the composite material.

Such materials need to be evaluated layer by layer, both for the ​core material​, ​reinforcement fibers​ as well as the ​matrix​.

Software like ABAQUS and ANSYS provide excellent options, but if you’re working specifically with composites, dedicated programs like NX Composites and ACD come with built-in tools to make the process even smoother.

Below are some useful resources for your reference:

1) LS-Dyna composites: dyna-composites.netlify.app​

2) An introduction to composite FE analysis by NAFEMS:Microsoft PowerPoint - NAFEMS_composites_webinar_july_09 [Compatibility Mode]​

3) Composite modeling Handbook (PDF): Modeling Composites Handbook: An Introduction to the How and Why with Femap, NX Nastran and LS-DYNA | Predictive Engineering​

And that’s a wrap!

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