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Depinning Dynamics of Crack Fronts
Julien Chopin1, Aditya Bhaskar2, Atharv Jog2
1Gulliver UMR 7083, CNRS-ESPCI ParisTech, PSL Research University, Paris, France Instititut Jean le Rond d'Alembert UMR 7190, Sorbonne Universités, CNRS-UPMC, Paris, France and Instituto de Física, Universidade Federal da Bahia, Campus Universitário de Ondina, rua Barão de Jeremoabo, BA 40210-340, Brazil.
Physical Review Letters
|December 22, 2018
Summary
Crack front dynamics in heterogeneous materials are governed by energy dissipation, not inertia. This finding allows prediction of crack speed fluctuations and better understanding of material failure properties.
Area of Science:
- Materials Science
- Physics
- Fracture Mechanics
Background:
- Microinstabilities in heterogeneous materials involve complex crack front dynamics between equilibrium positions.
- Understanding crack front behavior after depinning from obstacles is crucial for material failure analysis.
Purpose of the Study:
- To investigate the dynamics of a crack front during microinstabilities in heterogeneous materials.
- To determine the factors controlling crack front depinning dynamics after encountering an obstacle.
- To develop a predictive model for crack speed fluctuations.
Main Methods:
- Experimental investigation of crack front dynamics.
- Theoretical modeling of crack propagation and depinning.
- Analysis of spatiotemporal evolution of the crack front.
Main Results:
- Crack front depinning dynamics are controlled by the rate dependency of dissipative mechanisms, not inertia.
- A characteristic material speed emerges from the variation of fracture energy with crack speed.
- Crack speed fluctuations can be predicted using an overdamped equation of motion.
Conclusions:
- The study provides a quantitative description of critical depinning dynamics in disordered solids.
- Findings offer new perspectives for predicting the effective failure properties of heterogeneous materials.
- Highlights the importance of dissipative mechanisms in fracture processes.
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