This work addresses specific fundamental and methodological issues regarding the applicability of Fracture Mechanics (FM) testing schemes to polymer open-celled cellular solids with controlled architecture, exhibiting an elastic–plastic response and with pronounced structural heterogeneity at the cell-scale. Acrylonitrile-Butadiene-Styrene (ABS) model structures were manufactured by Fused Deposition Modeling (FDM), and their mode-I fracture response investigated. Structures with different porosity degrees (from ≈ 20% to ≈ 70%) were examined, and initiation fracture toughness (J-integral) data determined. Different modes of mechanical macro-confinement experienced by the circular cross-section beam-like structural element were noticed, able to drive a transition from true cellular to solid containing isolated pores.
Fracture characterization of ductile polymer cellular model structures manufactured by FDM
Jacopo Agnelli;Irene Fassi;Fabio Bignotti;Francesco Baldi
2025-01-01
Abstract
This work addresses specific fundamental and methodological issues regarding the applicability of Fracture Mechanics (FM) testing schemes to polymer open-celled cellular solids with controlled architecture, exhibiting an elastic–plastic response and with pronounced structural heterogeneity at the cell-scale. Acrylonitrile-Butadiene-Styrene (ABS) model structures were manufactured by Fused Deposition Modeling (FDM), and their mode-I fracture response investigated. Structures with different porosity degrees (from ≈ 20% to ≈ 70%) were examined, and initiation fracture toughness (J-integral) data determined. Different modes of mechanical macro-confinement experienced by the circular cross-section beam-like structural element were noticed, able to drive a transition from true cellular to solid containing isolated pores.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
