When performing a Shear Strength Reduction analysis (in the FEM module), Slide3 automatically weakens the material properties. The Crack Link ensures that as the strength reduction factor ($SRF$) increases, the interaction between the water pressure and the joint strength is recalculated. The failure surface is forced to respect the geometry of the crack; the solver cannot calculate a failure surface that ignores the discontinuity, forcing a more realistic (often more conservative) failure mechanism.
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Slide3 is a software product from Rocscience, a company specializing in geotechnical engineering software. Slide3 is likely used for analyzing slope stability and landslide risk. When performing a Shear Strength Reduction analysis (in