Draft:Griffith (unit)

  • Comment: There are 5 sources linked with a name similar to that of the submitting editor, an unanswered COI question on their talk page, and a draft resubmitted without any changes since the last decline. The submitting editor would be well advised to go through the sourcing and text of this article to keep it in line with WP:42 before resubmitting it again. ChrysGalley (talk) 14:26, 30 January 2026 (UTC)
  • Comment: I'm only seeing trivial footnote mentions in the sourcing. The source that is to an online comment is an unreliable source, and the definition and usage sections currently are in need of sourcing. 🌸⁠wasianpower⁠🌸 (talk • contribs) 03:37, 17 December 2025 (UTC)
This page is about the unit. For the engineer, see Alan Arnold Griffith.

The griffith (symbol: Gf) is a proposed non-SI unit of the quantity expressed in pascal–metre to the one-half (Pa·m1/2), used in the context of fracture mechanics to quantify material resistance to crack propagation. The unit was suggested as a tribute to the British mechanical engineer Alan Arnold Griffith (1893–1963), whose pioneering work laid the foundations of modern fracture mechanics.

Definition

The griffith is defined as:

This unit corresponds to the same dimensions as the classical expression of fracture toughness terms used in linear elastic fracture mechanics (LEFM), where stress-intensity factors are commonly expressed in Pa·m1/2.

Common multiple unit of the griffith is the megagriffith (1 MGf = 106 Gf).

Origin and Proposal

The use of the unit was originally suggested by Pedro Rivero-Antúnez et al.,[1], and Prof. C. Ramadas and Mr. A. R. Jadhav [2] as a more intuitive and less cumbersome alternative to the expression Pa·m1/2. Their proposal intended to honour A. A. Griffith’s seminal contributions to the understanding of stress concentration, crack initiation, and brittle fracture.

The first documented proposal of the term griffith in an official international scientific context appears in a 2020 article by Rivero-Antúnez et al..[1]. In this work, the authors adopted the designation “griffith” (Gf) for the unit Pa·m1/2 when reporting fracture-related mechanical properties of alumina-based ceramics. According to the authors, their literature search revealed one earlier public discussion on the website iMechanica[2], where the possibility of naming the fracture toughness unit had been debated. Since then, it has been used in some other articles published at international journals [3][4][5]

Historical Background

The unit is named after Alan Arnold Griffith, who introduced the energy-based approach to fracture and established the relationship between crack size, applied stress, and failure in brittle solids. His classical 1921 paper, The Phenomena of Rupture and Flow in Solids, is recognized as one of the foundational works of modern fracture mechanics..[6]

Usage

Although the griffith is not an SI unit and is not formally recognized by standards organizations, it has been proposed as a convenient shorthand within the fracture mechanics community, particularly in scientific publications dealing with the mechanical characterization of brittle materials.

See also

References

  1. ^ a b P. Rivero-Antúnez, R. Cano-Crespo, L. Esquivias, N. de la Rosa-Fox, C. Zamora-Ledezma, A. Domínguez-Rodríguez, V. Morales-Flórez, "Mechanical characterization of sol–gel alumina-based ceramics with intragranular reinforcement of multiwalled carbon nanotubes," Ceramics International, vol. 46, 2020, pp. 19723–19730. https://doi.org/10.1016/j.ceramint.2020.04.285
  2. ^ a b Jadhav, Ajit R. (2007, 6 August). “Naming the SI Unit for Fracture Toughness (KIC)”. iMechanica – the web of mechanics and mechanicians. https://imechanica.org/comment/30363#comment-30363.
  3. ^ P. Rivero-Antúnez, R. Cano-Crespo, F. Sánchez-Bajo, A. Domínguez-Rodríguez, V. Morales-Flórez, "Reactive SPS for sol–gel alumina samples: Structure, sintering behavior, and mechanical properties", Journal of the European Ceramic Society, vol. 41, no. 11, 2021, pp. 5548–5557. https://doi.org/10.1016/j.jeurceramsoc.2021.04.060
  4. ^ P. Rivero-Antúnez, V. Morales-Flórez, F. L. Cumbrera, L. Esquivias, "Rietveld analysis and mechanical properties of in situ formed La-β-Al2O3/Al2O3 composites prepared by sol-gel method", Ceramics International, vol. 48, no. 17, 2022, pp. 24462–24470. https://doi.org/10.1016/j.ceramint.2022.05.058
  5. ^ P. Rivero-Antúnez, C. Zamora-Ledezma, F. Sánchez-Bajo, J. C. Moreno-López, E. Anglaret, V. Morales-Flórez, "Sol–gel method and reactive SPS for novel alumina–graphene ceramic composites", Journal of the European Ceramic Society, vol. 43, no. 3, 2023, pp. 1064–1077. https://doi.org/10.1016/j.jeurceramsoc.2022.10.043
  6. ^ Griffith, A. A., "The Phenomena of Rupture and Flow in Solids," Philosophical Transactions of the Royal Society A, 221, 1921, pp. 163–198.

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