Department of Manufacturing Engineering
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Browsing Department of Manufacturing Engineering by Author "Aksungur, Doğan Kıvanç"
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Item APPLICATION OF SLITTING METHOD FOR MEASUREMENTS OF COLD ROLLING RESIDUAL STRESSES(2022-02-16) Aksungur, Doğan Kıvanç; Şimşir, CanerIt is known that cold-rolling residual stresses are associated with certain defects and affect the performance of succeeding manufacturing operations. Because of that, raw material manufacturers try to reduce those stresses by some post-treatments such as stretching and pressing. Determination of through-thickness residual stress profile is important for the design of both the rolling and stress relaxation treatment. This information can also be useful in the design of common manufacturing operations such as bending, and welding and it can be acquired by several residual stress measurement techniques such as neutron/synchrotron diffraction, slitting, contour method etc. In this study, slitting and ring-core methods have been applied to measure through thickness stress distribution on rectangular bars cut by wire- Electrical Discharge Machining (w-EDM) from a cold-rolled and stress relaxed AA 5083 plate. The compliance matrix for slitting method is derived using Finite Element Analysis (FEA) and calibration matrix for ring-core method is acquired from [1]. The results indicate a good agreement while the slitting method slightly over-estimates the stresses due to neglection of transverse stresses according to assumed cold rolled stress profile. In addition, residual stress measurements were made with the ring core method to confirm the stresses obtained with the slitting method. Measurements with the ring-core method were done up to the quarter of the maximum thickness of 20 mm. Under the circumstances, the residual stress profile due to slitting and ring-core methods was observed to be similar for a certain depth.