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Volumes were used as MrCatia says. Now days, volumes are going out of favor, however heritage models are still being used.
Wht type of modeling method used also depends on what the model is being used for. Fibersim has been used with Catia V4 for modeling layups, particularly when used with automated tape laying machines. But that is years old information. I do not know what the standards are these days. I would think that Stress engineers would like discrete layer modeling for use with analysis programs to identify any problems with a layup. Trying to use a monolithic solid does not allow for thermal warp and uni-ply buildup effects.
Designers like plain old solids (solids by V5 standards) unless they are the type that do their own analysis. But recognize, analysis models differ from models for manufacturing needs.