Determination of Mixed-Mode Cohesive Zone Failure Parameters Using Digital Volume Correlation and the Inverse Finite Element Method

J.Y.S. Li-Mayer; M. Martinez; J. Lambros; M.N. Charalambides

doi:10.4028/www.scientific.net/KEM.774.72

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 774Determination of Mixed-Mode Cohesive Zone Failure...

Determination of Mixed-Mode Cohesive Zone Failure Parameters Using Digital Volume Correlation and the Inverse Finite Element Method

Abstract:

The suitability of an optimisation workflow for the determination of the mixed-mode cohesive zone model parameters using digital volume correlation (DVC) data and the inverse finite element method was examined. A virtual compression experiment of a cylinder with a spherical inclusion was modelled using the finite element method. A bilinear traction separation law with a linear mixed-mode relationship was used to describe the interfacial behaviour. Known mode I and mode II fracture energies, = 20 J/m² and = 40 J/m² and damage initiation stress, = 0.09 MPa, were used to generate a target composite debonding behaviour. An objective function,, determined based on the debonding behaviour measurable by DVC was chosen. A full factorial experiment was carried out for the four cohesive parameters and showed that correlation between fracture energies/ damage initiation stresses and is non-linear and discontinuous with multiple local minima. Optimisations initiated at the local minima identified from the full factorial experiment correctly determined the target cohesive fracture energies and damage initiation stresses.

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Periodical:

Key Engineering Materials (Volume 774)

Pages:

72-76

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.774.72

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Online since:

August 2018

Authors:

J.Y.S. Li-Mayer*, M. Martinez, J. Lambros, M.N. Charalambides

Keywords:

Cohesive Zone Model, Composites, Mixed-Mode, Optimisation

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