Addcomposites Blog

eVTOL Crashes Give You Almost No Room to Absorb Impact. A New CFRP Tube Cross-Section Is Designed for Exactly That

A 2025 open-access study in Defence Technology tests concave polygonal CFRP crush tubes for eVTOL subfloors — up to 20% better axial energy absorption than a square tube, until an oblique impact angle exposes a base-slippage failure the authors close with an outward crusher plug. Our summary of Fu, Liu, Liu & Zhang (2025), plus what the corner-heavy geometry means for automated fiber placement.

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