SKM 2023 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 33: Topical Session: Fundamentals of Fracture – Amorphous Metals

MM 33.5: Vortrag

Mittwoch, 29. März 2023, 16:45–17:00, SCH A 215

Nonlinear elastic effect on interacting crack paths in PDMS films — •Loic Vanel1, Osvanny Ramos1, Thierry Biben1, Stéphane Santucci2, and Anthony Gravouil31ILM - UCBL, Villeurbanne, France — 2LPENS - ENS Lyon, France — 3LAMCOS, INSA Lyon, France

The observed repulsive behaviour of two initially collinear cracks growing towards each other and leading to a hook-shaped path questioned recently the validity of the Principle of Local Symmetry within Linear Elastic Fracture Mechanics theory [1]. Theoretical and numerical work has solved this dilemma, providing the precise geometric conditions for the existence of the repulsive phase and revealing a multi-scale behaviour of the repulsive/attractive transition [2].

Nonlinear elastic materials such as elastomers depart from the prediction of linear elasticity for interacting cracks. We performed experiments on PDMS film that indeed show a maximum angle of repulsion not only significantly smaller than the one of linear elasticity, but also smaller than the one observed in polymer films with a plastic process zone. Our FEM simulations on a Mooney-Rivlin material confirm that the nonlinear elastic response of PDMS modifies the crack path, reducing the repulsive strength between the two interacting cracks.

References [1] Dalbe, M.-J.; Koivisto, J.; Vanel, L.; Miksic, A.; Ramos, O.; Alava, M.; Santucci, S.; Phys. Rev. Lett. 2015 114, 205501 [2] Schwaab, M.-E.; Santucci, S.; Biben, T.; Gravouil, A.; Vanel, L. ; Phys. Rev. Lett. 2018 120, 255501.

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