ühesuunalisel tõmbekatsel/-teimil määratav geomeetriline tegur; iseloomustab kriitilise nihkepinge, mille juures algab libisemine libisemispinnal, ning aksiaalpinge suhet (vt libisemine kristallis), in a uniaxial tension test, the geometric factor that corresponds to the product of the cosine of the angle between the tension axis and the slip-plane normal and the cosine of the angle between the tension axis and the slip direction (see: slip)