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

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

### Giovanni Corsi, Antonino Favata, Stefano Vidoli

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 phase-field 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].

Keywords
Asymptotic Approach, Fracture Mechanics, Slender Structures

Published online 3/17/2022, 6 pages

Citation: Giovanni Corsi, Antonino Favata, Stefano Vidoli, A phase-field model for fracture in beams from asymptotic results in 2D elasticity, Materials Research Proceedings, Vol. 26, pp 115-120, 2023

DOI: https://doi.org/10.21741/9781644902431-19

The article was published as article 19 of the book Theoretical and Applied Mechanics

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

References
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