Analysis of Open Foams

The strut system of open cell foams can usually be easily segmented (separated from the pore space). Given the resulting image with the strut system as foreground, porosity, specific surface area, and mean strut length per volume can be measured. Under mild model assumptions, further foam specific mean characteristics like the mean cell volume are derived. Pores inside struts are dealt with separately by filling these wholes morphologically.

These mean values do however not capture the variability e.g. of the cell size. The Euclidean distance transform on the pore space followed by the watershed transform tessellates the pore space into cells. Based on this image analytic reconstruction of the cells empirical distributions of cell characteristics like volume or shape can be determined.

Image-analytically separated cell system.
© Photo ITWM

Image-analytically separated cell system.

Reconstructed tomographic image of a nickel-chromium foam.
© Photo ITWM

Reconstructed tomographic image of a nickel-chromium foam.

Empirical Cell Size Distribution of Nickel-Chrome Foam
© Photo ITWM

Empirical Cell Size Distribution of Nickel-Chrome Foam

Publications

  • Losch, K.; Schladitz, K.; Ballaschk, U.; Berek, H.; Aneziris, C.G.:
    Interrupted In-Situ Compressive Deformation Experiments on MMC Foams in an XCT.
    Image, Analysis & Stereology 33, No.2, pp. 131-145, (2014).
  • Vecchio, I.; Redenbach, C.; Schladitz, K.:
    Angles in Laguerre Tessellation Models for Solid Foams.
    Computational Materials Science, Volume 83, pp. 171-184, (2014).
  • Schladitz, K.; Redenbach, C.; Sych, T.; Godehardt, M.:
    Model Based Estimation of Geometric Characteristics of Open Foams.
    Methodology and Computing in Applied Probability, pp. 1-22, (2011).