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Delayed fracture in porous media
Noushine Shahidzadeh-Bonn1, Philippe Vié, Xavier Chateau
1Institut Navier, Laboratoire des Matériaux et Structures du Génie Civil, 2 allée Kepler, 77420 Champs sur Marne, France.
Physical Review Letters
|December 31, 2005
Summary
Fracture in porous materials can be delayed, unlike instantaneous failure in solid materials. This delay allows for quantifying material lifetime, with fracture probability linked to crack nucleation.
Area of Science:
- Materials Science
- Civil Engineering
- Solid Mechanics
Background:
- Homogeneous solids fracture instantaneously at a defined breaking strength.
- Porous media exhibit delayed fracture behavior under constant load.
- Understanding fracture mechanics in porous materials is crucial for structural integrity.
Purpose of the Study:
- To investigate the delayed fracture phenomenon in porous media.
- To establish a relationship between fracture probability and crack nucleation.
- To quantify the average lifetime of porous materials.
Main Methods:
- Analysis of fracture in porous media under constant load.
- Calculation of activation energy for crack nucleation.
- Consideration of material porosity in fracture models.
Main Results:
- Fracture in porous media can occur with a time delay.
- Average fracture probability is determined by crack nucleation probability.
- Activation energy calculations provide insight into nucleation processes.
Conclusions:
- Delayed fracture is a characteristic of porous media.
- Crack nucleation is the determining factor for fracture probability and material lifetime.
- Porosity significantly influences the crack nucleation and subsequent fracture behavior.
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