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research article

Dynamics of fracturing saturated porous media and self-organization of rupture

Peruzzo, C.  
•
Cao, D. T.
•
Milanese, E.  
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March 1, 2019
European Journal Of Mechanics A-Solids

Analytical solutions and a vast majority of numerical ones for fracture propagation in saturated porous media yield smooth behavior while experiments, field observations and a few numerical solutions reveal stepwise crack advancement and pressure oscillations. To explain this fact, we invoke self-organization of rupture observed in fracturing solids, both dry and fully saturated, when two requirements are satisfied: i) the external drive has a much slower timescale than fracture propagation; and ii) the increment of the external load (drive) is applied only when the internal rearrangement of fracture is over. These requirements are needed to obtain clean Self Organized Criticality (SOC) in quasi-static situations. They imply that there should be no restriction on the fracture velocity i.e. algorithmically the fracture advancement rule should always be independent of the crack velocity. Generally, this is not the case when smooth answers are obtained which are often unphysical. Under the above conditions hints of Self Organized Criticality are evident in heterogeneous porous media in quasi-static conditions using a lattice model, showing stepwise advancement of the fracture and pressure oscillations. We extend this model to incorporate inertia forces and show that this behavior still holds. By incorporating the above requirements in numerical fracture advancement algorithms for cohesive fracture in saturated porous continua we also reproduce stepwise advancements and pressure oscillations both in quasi-static and dynamic situations. Since dynamic tests of dry specimens show that the fracture advancement velocity is not constant we replicate such an effect with a model of a debonding beam on elastic foundation. This is the first step before introducing the interaction with a fluid.

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Type
research article
DOI
10.1016/j.euromechsol.2018.12.004
Web of Science ID

WOS:000458221500035

Author(s)
Peruzzo, C.  
Cao, D. T.
Milanese, E.  
Favia, P.
Pesavento, F.
Hussain, F.
Schrefler, B. A.
Date Issued

2019-03-01

Publisher

ELSEVIER SCIENCE BV

Published in
European Journal Of Mechanics A-Solids
Volume

74

Start page

471

End page

484

Subjects

Mechanics

•

propagation

•

behavior

Note

10th EUROMECH Solid Mechanics Conference, Bologna, ITALY, Jul 02-06, 2018

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
GEL  
LSMS  
Available on Infoscience
June 18, 2019
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/157584
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