Geometric classification of open-cell metal foams using X-ray micro-computed tomography

The geometry of foams has long been an area of interest, and a number of idealized geometric descriptions have been proposed. In order to acquire detailed, quantitative, geometric data for aluminum open-cell metal foams, X-ray μCT is employed. The X-ray μCT images are analyzed using specialized software, FoamView®, from which geometric information including strut length and pore shapes are extracted. The X-ray μCT analysis allows comparison of the ideal geometric models to the actual geometric characteristics of the metal foam samples. The results reveal a high variability in ligament length, as well as features supporting the ideal geometry known as the Weaire–Phelan unit cell. The geometric findings provide information useful for improving current models of open-cell metal foam. Applications can range from predicting heat transfer or load failure to predicting liquid retention.

Graphical AbstractFigure optionsDownload as PowerPoint slideHighlights
► Aluminum open-cell metal foams are geometrically classified
► X-ray micro-computed tomography and specialized software are used to gather geometric data
► The foams are shown to have a high variability in strut length
► The Weaire–Phelan unit cell is shown to be a better representative of these foams