tasand, mida pidi toimub nihe plastse deformatsiooni käigus; lõiketöötlusel moodustub nihketasandit mööda laast (vt nihkepurunemine), the plane in which shear stress occurs and shear takes place; in metal cutting, a confined zone along which shear, extending from the cutting edge to the work surface, takes place (see: shear fracture)