Abstract
The use of simple beam theory for cohesive zone modelling of the damage response at the crack tip in linear elastic isotropic double cantilever beam (DCB) specimens has been investigated. Damage resistance curves (DR‐curves) relating the applied stress intensity factor to the growth of the cohesive zones for beam theory modelling has been compared with two‐dimensional elasticity calculations for different material parameters and specimen dimensions. A substantial difference is observed between DR‐curves for the two types of models. As expected this difference vanishes for decreasing beam heights. For large beam heights the DR‐curves calculated by two‐dimensional elasticity are approaching small‐scale yielding DR‐curves, i.e. DR‐curves for an edge crack in an infinite plate. The beam height for which beam theory is applicable could be up to 10‐3 times the height for which small scale bridging DR‐curves are applicable.
Published Version
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