Abstract
A new general method of constructing weight functions (WFs) for three-dimensional elastic bodies with planar cracks is presented. It is shown that in order to obtain the WFs it suffices to know a sample solution of the problem under consideration corresponding to the simplest load on the crack surfaces as well as Green's function for the domain occupied by the crack. As an example a three-dimensional WF is constructed for a strip-shaped crack in an unbounded homogeneous isotropic elastic body.
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