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This paper reports the elasticity solutions to the stress intensity factors (SIFs) and strain energy release rates (ERRs) of orthotropic elastic double cantilever beams (DCBs) under antiplane cracking. The known solution of a single screw dislocation in an infinite anisotropic elastic medium and conformal mapping technique are employed for the solving procedure. The present solutions are able to examine the effect of specimen geometries on the SIF of the DCB specimens and overcome the geometrical limitation of the classic beam theory that all DCB fracture specimens rely on. The upper and lower limits of the SIFs are obtained in explicit expressions. In the limiting cases, the present solutions can recover the SIF solutions of conventional DCB specimens. 

double cantilever beam (DCB), stress intensity factor (SIF), energy release rate (ERR), composite materials.