Learning Forum

[rileylau0913]

Hi all,

I am trying to simulate a hypervelocity impact (~5 km/s) on a CFRP laminate consisting of 16 plies with 15 resin-rich interlayers using the SPH method.

I already know the stacking sequence and fiber orientation of each ply. However, I am unsure how to properly construct the laminated structure in an SPH model.

In particular, I would like to understand:

• How to assign the orthotropic fiber orientation for each ply when using SPH particles.
• How to represent the interlaminar interfaces between plies (e.g., contact or cohesive behavior).
• How to build the layered laminate structure itself so that ply-level damage mechanisms such as fiber breakage, fiber–matrix debonding, and ply delamination can be captured.

What is the recommended approach to model the ply orientations, interply interfaces, and the laminate stacking structure when using SPH for CFRP impact simulations?

[peteroznewman]

ChatGPT was prompted to answer this question for the LS-Dyna solver and then to comment on the Autodyn limitations.

https://chatgpt.com/share/69aebfd3-fed8-8013-bd54-e3ba1f1f4462

Note that ChatGPT can make mistakes so use with the response with caution.