Where does honeycomb collide?

In materials engineering a honeycomb is an engineered cellular solid: a two-dimensional array of prismatic cells, usually hexagonal, that behaves as a lightweight structural material whose stiffness and strength follow from the cell-wall material, the relative density, and the cell geometry. Gibson and Ashby's Cellular solids: Structure and properties sets out the mechanics by which such honeycombs deform, buckle, and crush, and why a honeycomb core bonded between two face sheets gives a sandwich panel its high bending stiffness at low weight. The referent is a deliberately built periodic structure prized for its efficiency, the opposite of an accidental flaw, and unrelated to a lung's appearance or to voids in cast concrete beyond sharing the comb-cell image.[1]

Unit

Relative density and cell geometry governing the cellular material's stiffness and strength

Recovery means

Not applicable

Measured by

Characterised by relative density, cell size and wall thickness, and the out-of-plane and in-plane stiffness and crush strength of the core

In thoracic radiology honeycombing is a specific imaging sign of established pulmonary fibrosis: clustered, thick-walled cystic airspaces of roughly similar diameter, typically subpleural and stacked in layers, that give the lung a comb-like appearance on high-resolution CT. The Fleischner Society glossary (Hansell et al., 2008) defines the term precisely because its presence is a key criterion for diagnosing usual interstitial pneumonia and carries prognostic weight. The referent is a pattern of destroyed, remodelled lung tissue read off an image, a marker of irreversible disease rather than a designed structure or a casting defect.[2]

Unit

Presence and extent of clustered subpleural cystic airspaces on CT

Recovery means

Honeycombing marks irreversible fibrotic remodelling; it does not resolve, though its extent is tracked for progression

Measured by

Identified on high-resolution CT by its clustered, similarly sized, thick-walled subpleural cysts and scored for extent