The fracture toughness of Schwarz Primitive triply periodic minimal surface lattice

[Display omitted] •A minimum of 18 cells along the specimen width are needed for accurate KIc measurement.•KIc is shown to increase linearly with relative density ρ¯ and square root of cell size l.•Depending on ρ¯ and l, a transition from continuous to discontinuous crack growth is observed. Triply...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Theoretical and applied fracture mechanics 2023-06, Vol.125, p.103924, Article 103924
Hauptverfasser: Almomani, Abdulla, Mourad, Abdel-Hamid I.
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:[Display omitted] •A minimum of 18 cells along the specimen width are needed for accurate KIc measurement.•KIc is shown to increase linearly with relative density ρ¯ and square root of cell size l.•Depending on ρ¯ and l, a transition from continuous to discontinuous crack growth is observed. Triply periodic minimal surface (TPMS) lattices have recently been shown to exhibit extraordinarily low densities and multi-functionalities. Nevertheless, the dependence of their fracture toughness KIc on relative density ρ¯, unit cell size l and the number of unit cells ahead of the crack tip suggest a lack of understanding of the governing parameters. This also extends to the adequacy of using the current conventional fracture testing protocols. Therefore, the objective of this work is threefold: (i) extract the minimum Schwarz Primitive unit cells for accurate toughness measurement, (ii) estimate KIc of polylactic acid Schwarz Primitive TPMS applying linear elastic fracture mechanics (LEFM) conditions, (iii) investigate the effect of relative density ρ¯ and unit cell size l on the fracture toughness. With 18 cells along the specimen width, KIc is shown to increase linearly with ρ¯ and with the square root of l. Outcomes from this work is aimed toward understanding the damage tolerance of TPMS lattices, and hence the reliability of such new emerging lightweight materials.
ISSN:0167-8442
1872-7638
DOI:10.1016/j.tafmec.2023.103924