Accurate Strain Field Measurement During Strip Rolling by Exploiting Recurring Material Motion with Time-Integrated Digital Image Correlation

Abstract Background 95% Of all metals and alloys are processed using strip rolling, explaining the great number of existing rolling optimization models. Yet, an accurate in-situ full-field experimental measurement method deformation, velocity strain fields in deformation zone is lacking. Objective Here, a novel time-Integrated Digital Image Correlation (t-IDIC) framework proposed validated that fully exploits notion continuous, recurring material motion during rolling. Methods High accuracy robustness against unavoidable light reflections missing speckles achieved by simultaneously correlating many (e.g. 200) image pairs single step, i.e. each pair correlated with same average global displacement field but multiplied unique corrector to account for differences between pairs. Results Demonstration on two different experiments revealed previously inaccessible subtle changes due minor variations pre-deformation, elastic recovery, geometrical irregularities. The influence work roll force entry/exit tension has been investigated industrial pilot mill, which unexpected non-horizontal feed. This asymmetry was reduced increasing entry force, resulting more symmetric distribution, while increased distance neutral point found larger force. Conclusions t-IDIC allows robust characterization strip’s behavior revealing insights behavior.