Modelling the plastic behaviour of high-strength tubes applied in the rotary draw bending
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Benchmarks are standard references to enable the comparison of different modelling approaches on the prediction ability metal forming processes parameters. ESAFORM has been actively promoting benchmark activities within the field of material forming, which aim to promote the discussion of different experimental and modelling strategies. In this context, the ESAFORM Benchmark 2026 (ESAbend26) focus on the industrial tube bending process, known as rotary draw bending (RDB) [1]. The benchmark committee will conduct all the material characterization and RDB experiments across different laboratories and supply the resulting data to the participants. Participants are asked to model the bending process with a computational approach of their own choice as well as the material behaviour with different modelling complexity. High-strength steel tubes will be characterized using different experimental set-ups, including ring hoop and twin-tube tensile tests [2]. This works focuses on the procedures adopted to model the plastic behaviour of the tube, based on the experimental data made available by the benchmark committee. In particular, the work addresses the hardening law and its extrapolation, but also the yield criterion, discussing the inherent difficulties associated with the mechanical analysis of tubular geometries.