A cohesive element model for mixed mode loading with frictional contact capability

Authors

  • Leonardo Snozzi,

    1. École Polytechnique Fédérale de Lausanne (EPFL), School of Architecture, Civil and Environmental Engineering (ENAC), Computational Solid Mechanics Laboratory (LSMS), Lausanne, Switzerland
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  • Jean-François Molinari

    Corresponding author
    • École Polytechnique Fédérale de Lausanne (EPFL), School of Architecture, Civil and Environmental Engineering (ENAC), Computational Solid Mechanics Laboratory (LSMS), Lausanne, Switzerland
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Jean-François Molinari, Bâtiment GC - A2, Station 18, CH 1015-Lausanne, Switzerland.

E-mail: jean-francois.molinari@epfl.ch

SUMMARY

We present a model that combines interface debonding and frictional contact. The onset of fracture is explicitly modeled using the well-known cohesive approach. Whereas the debonding process is controlled by a new extrinsic traction separation law, which accounts for mode mixity, and yields two separate values for energy dissipation in mode I and mode II loading, the impenetrability condition is enforced with a contact algorithm. We resort to the classical law of unilateral contact and Coulomb friction. The contact algorithm is coupled together to the cohesive approach in order to have a continuous transition from crack nucleation to the pure frictional state after complete decohesion. We validate our model by simulating a shear test on a masonry wallette and by reproducing an experimental test on a masonry wall loaded in compression and shear. Copyright © 2012 John Wiley & Sons, Ltd.

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