Analysis of Density-Dependent Cell Structure of EPP Bead Foams Under Compression

• DOI: 10.1007/s11340-025-01151-8
• Publication Date: 2025-02-04T21:16:05Z
• Authors: I. Koch; G. Preiß; M. Müller-Pabel; B. Grüber; M. Gude
• Keywords: Sphericity; Bead; Orthotropic material; Polypropylene

Abstract Background Closed cell polymer bead foams are widely used in industrial applications due to their extraordinary damping and insulation properties. To understand the structure-property-relations at different deformation states volumetric structure of walls, cells beads should be statistically analysed. Objective The presented work is focused on statistical analysis changing expanded polypropylene density distinct compression states. Methods Cylindrical foam specimens scanned by x-ray computed tomography 3-5 reconstructed volume information segmented Results It could shown that, among others, sphericity orientation relative plane normal loading direction sensitive parameters state. With regard material symmetry level, a shift isotropic transversal was observed. No sudden, stability related, or failure Conclusions Good metrics for from in-situ tests orientation. Compression leads gradually change level isotropy anisotropy.