We propose a derivation of a damage model in slender structures, focusing on the particular case of a rod. The peculiarity of the model is that it takes into account the changes in rigidity of the body, distinguishing between bending, traction and the possible mixed interactions between the two. The approach is based on a matched asymptotic expansion, taking the recent work of Baldelli et al [1] as starting point. Choosing the slenderness of the rod as small parameter for the asymptotic expansion, we determine the first order at which a correction occurs with respect to the Saint-Venant solution of the elastic problem, due to the presence of a crack. The results highlight that the presence of a defect affects in different ways the bending and traction rigidities of the rod, and that a coupling between the two deformation modes might occur, depending on the geometry of the crack. Moreover, the derivation allows to explicitly calculate the coefficients of this correction, for any given depth of the crack, by means of a simple numerical procedure. Application to the classic three-point bending problem is considered in order to highlight the predictive capabilities of the model. These results suggest ways in which state of the art phasefield models (e.g. [2]) for damage could be refined. This work goes in the direction of developing phase-field models suitable for application to slender structures, where the use of reduced dimensional models has proved promising [3].

A phase-field model for fracture in beams from asymptotic results in 2D elasticity / Corsi, G.; Favata, A.; Vidoli, S.. - 26:(2023), pp. 115-120. (Intervento presentato al convegno 25th Conference of the Italian Association of Theoretical and Applied Mechanics, AIMETA 2022 tenutosi a ita) [10.21741/9781644902431-19].

A phase-field model for fracture in beams from asymptotic results in 2D elasticity

Corsi G.;Favata A.;Vidoli S.
2023

Abstract

We propose a derivation of a damage model in slender structures, focusing on the particular case of a rod. The peculiarity of the model is that it takes into account the changes in rigidity of the body, distinguishing between bending, traction and the possible mixed interactions between the two. The approach is based on a matched asymptotic expansion, taking the recent work of Baldelli et al [1] as starting point. Choosing the slenderness of the rod as small parameter for the asymptotic expansion, we determine the first order at which a correction occurs with respect to the Saint-Venant solution of the elastic problem, due to the presence of a crack. The results highlight that the presence of a defect affects in different ways the bending and traction rigidities of the rod, and that a coupling between the two deformation modes might occur, depending on the geometry of the crack. Moreover, the derivation allows to explicitly calculate the coefficients of this correction, for any given depth of the crack, by means of a simple numerical procedure. Application to the classic three-point bending problem is considered in order to highlight the predictive capabilities of the model. These results suggest ways in which state of the art phasefield models (e.g. [2]) for damage could be refined. This work goes in the direction of developing phase-field models suitable for application to slender structures, where the use of reduced dimensional models has proved promising [3].
2023
25th Conference of the Italian Association of Theoretical and Applied Mechanics, AIMETA 2022
Asymptotic Approach; Fracture Mechanics; Slender Structures
04 Pubblicazione in atti di convegno::04b Atto di convegno in volume
A phase-field model for fracture in beams from asymptotic results in 2D elasticity / Corsi, G.; Favata, A.; Vidoli, S.. - 26:(2023), pp. 115-120. (Intervento presentato al convegno 25th Conference of the Italian Association of Theoretical and Applied Mechanics, AIMETA 2022 tenutosi a ita) [10.21741/9781644902431-19].
File allegati a questo prodotto
File Dimensione Formato  
Corsi_PhaseField_2022.pdf

accesso aperto

Tipologia: Versione editoriale (versione pubblicata con il layout dell'editore)
Licenza: Creative commons
Dimensione 288.1 kB
Formato Adobe PDF
288.1 kB Adobe PDF

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1678461
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 1
  • ???jsp.display-item.citation.isi??? ND
social impact