Straightening

Impact of straightening on material strength The method used for straightening is three-points bending, as Fig. 1 shows. During the straightening in Stryker Suzhou, the bending moment M is such that the normal stresses in the material remain below the yield strengthσmax in Fig. 2. This means that, for all practical purposes, the stresses in the material will remain below the proportional limit and the elastic limit as well. Assuming the material to be homogeneous, the stress imposed on the material would not cause damage to the metal molecular. So the main impact is the residual stress, which could be relieved by annealing if the residual stress is large enough.

Fig. 1 Schematic diagram of three-points bending

Fig. 2 Stress-strain material diagram