2. Mechanical aspects

2.1 Bearing role

When the total elongation of the sheet is less than the initial bearing length of the annealed sheet A _p (cf. , the deformation measured corresponds in fact to an average of values from the network of alternating deformed and undeformed strips created by the skin-pass and modified by the second tensile deformation. Aging will only affect the deformed strips and harden them. If sufficient ageing occurs, the new tensile test (figure 5 ) will first deform the intact zones, and the yield strength of the annealed sheet (usually not measured beforehand) will be restored,...