Numerical and Experimental Investigations on Tube Section Flattening for Parameter Identification and Advanced Material Modeling of Tubes

At present, there are no experimental methods that allow for the complete direction-dependent mechanical characterization of tubes. This considerably limits parameterization complex, anisotropic material models. The present study introduces a new approach to overcome these limitations: tube sections first flattened into planar geometry; then, samples uniaxial testing taken out section and used parameter identification. In this paper, special emphasis is placed on intermediate step flattening, which investigated in detail both numerically experimentally. Flattening by pressing identified as most advantageous several options, procedure optimized numerical simulations address springback compensation. Experimental validation performed tubes (steel E235) with diameter 60 mm an average wall thickness 1.524 mm. Tube successfully custom-built tool only small remaining out-of-plane displacements after flattening. predicted force curves agree very well data.