Abstract
A closed form solution is presented for a crack in a thin soft layer sandwiched between two stiff adherends, which is shown to agree well with numerical data in the literature and finite element results. For sandwiched structures with a soft layer, the stress intensity factor of a crack lying parallel to the interface is much lower than that for a crack in a homogeneous solid subjected to the same remote applied stresses, and furthermore, the singular domain near the crack tip is much smaller than in a homogeneous solid. It has also been found that, the plastic zone length as determined from the actual stress intensity factor would greatly underestimate the actual extent of plastic deformation, even under small scale yielding condition.
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