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Average crack front velocity during subcritical fracture propagation in a heterogeneous medium
 

Summary: Average crack front velocity during subcritical fracture propagation in a
heterogeneous medium
Olivier Lenglin´e, Renaud Toussaint, and Jean Schmittbuhl
IPGS, EOST, CNRS, Universit´e de Strasbourg, 5 rue Ren´e Descartes, 67084, Strasbourg, France
Jean Elkhoury, J.P. Ampuero
Seismological Laboratory, California Institute of Technology, Pasadena, USA
Ken Tore Tallakstad, St´ephane Santucci, and Knut Jørgen M°aløy
Department of Physics, University of Oslo, PB 1048 Blindern, NO-0316 Oslo, Norway
(Dated: April 20, 2011)
We study the average velocity of crack fronts during stable interfacial mode I fracture experiments
in a heterogeneous quasi-brittle material under various loading rates, at imposed loading speed or
during long relaxation tests, exploring subcritical to critical regimes. Transparency of the material
(PMMA) allows to track continuously the front position and to relate its evolution to the energy
release rate. Despite significant velocity fluctuations at local scales [1], we show that a model of
independent thermally activated sites successfully reproduces the large scale behavior of the crack
front for several loading conditions.
I. INTRODUCTION
Fracturing of materials is an important scientific issue
that is strongly related to the strength of engineering
structures and natural materials such as rocks [2], sea ice

  

Source: Ampuero, Jean Paul - Division of Geological and Planetary Sciences, California Institute of Technology

 

Collections: Geosciences