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→5.1.7.3 Bendability
The measure for bendability of a strip material is the smallest possible bending radius r of a sample piece of given material thickness s without appearance of surface cracking. Bending tests are performed as either 90 degree bends according to ISO 7438 or as defined forth-and-back bending. The bendabilty of naturally hard copper alloys is significantly better perpendicular to the rolling direction than parallel to it ''(Figs. 5.41 and 5.42)''.
Fig. 5.41:Smallest possible bend radiifor 90° bends as a function of the 0.2%yield strength R – bend line p0.2perpendicular to the rolling direction
(Wieland)
[[File:Smallest possible bend radii for 90 bends as function.jpg|right|thumb|Smallest possible bend radii for 90° bends as a function of the 0.2% yield strength R<sub>p0.2</sub> – bend line perpendicular to the rolling direction (Wieland)]]
Fig. 5.42:
