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The wedge double-cantilever-beam (WDCB) adhesive bond specimen used. Pairs of bars (zirconia, graded zirconia, or feldspathic ceramic) are bonded by a resin composite. A crack starter is created using aluminum foil separator. The compression load P is applied by a 60° hardened steel wedge which is positioned on a 90° beveled clearance at the specimen edge. This load has a transverse component which opens up the crack faces.
