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→5.1.7.3 Bendability
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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 [[#figures10|(Figs. 4 – 7)]]<!--(Figs. 5.41 and 5.42)-->.
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<xr id="fig:Smallest possible bend radii for 90 bends as function"/> <!--Fig. 5.41: --> Smallest possible bend radii for 90° bends as a function of the 0.2% yield strength R – bend line p0.2 perpendicular to the rolling direction
(Wieland)
<xr id="fig:Smallest possible bend radii as a functionbend line parallel to the rolling direction"/> <!--Fig. 5.42: --> Smallest possible bend radii for 90° bends as a function of the 0.2% yield strength Rp0.2 – bend line parallel to the rolling direction (Wieland)
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