Elastic Instability behind Brittle Fracture - Sorbonne Université Accéder directement au contenu
Article Dans Une Revue Physical Review Letters Année : 2024

Elastic Instability behind Brittle Fracture

Résumé

We argue that nucleation of brittle cracks in initially flawless soft elastic solids is preceded by a nonlinear elastic instability, which cannot be captured without accounting for geometrical precise description of finite elastic deformation. As a prototypical problem we consider a homogeneous elastic body subjected to tension and assume that it is weakened by the presence of a free surface which then serves as a site of crack nucleation. We show that in this maximally simplified setting, brittle fracture emerges from a symmetry breaking elastic instability activated by softening and involving large elastic rotations. The implied bifurcation of the homogeneous elastic equilibrium is highly unconventional for nonlinear elasticity as it exhibits an extraordinary sensitivity to geometry, reminiscent of the transition to turbulence in fluids. We trace the post-bifurcational development of this instability beyond the limits of applicability of scale free continuum elasticity and use a phase-field approach to capture the scale dependent sub-continuum strain localization, signaling the formation of actual cracks.
Fichier principal
Vignette du fichier
2311.17372v4.pdf (1.31 Mo) Télécharger le fichier
Origine Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-04615145 , version 1 (18-06-2024)

Identifiants

Citer

D. Riccobelli, P. Ciarletta, G. Vitale, C. Maurini, L. Truskinovsky. Elastic Instability behind Brittle Fracture. Physical Review Letters, 2024, 132 (24), pp.248202. ⟨10.1103/PhysRevLett.132.248202⟩. ⟨hal-04615145⟩
0 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Mastodon Facebook X LinkedIn More