Springback and longitudinal bow are two major shape defects in gradual forming processes like chain-die roll forming. In this study, the springback of AHSS hat U profiles investigated through experiment finite element simulation. The disparity along direction signifies complex deformation during Based on simulation forming, process realized by sequential die blocks causes bending reverse-bendin...

Equal channel angular pressing (ECAP) is carried out using two different configurations for the exit channel of the ECAP die, i.e., relieved and choked, with angles of 0.2 °. It is found that using a die with relieved exit channel, the sample was extruded for 6 passes with no surface cracks and an average cell size of 727 nm and a fraction of high angle grain boundaries of 54 % were achieved. M...

Infrared spectra have been obt,aiiied of poly-Lproline in aqueous CaCL solutions. As the salt concentration is increased, the C=O stretching band develops a component at, the frequency found in the solid state while the CH, bending band broadens to higher frequency. Since circular dichroism spectra indicate progressive disordering of the chain with increasing salt, concentration, we associate t...

The principle of this process is shown in Figure 1. Only one die (the stretch-block) is needed, which contains the shape of the part. The sheet, clamped with two gripper jaws, is formed around the stretch-block, when the grippers move along the given trajectories. Accurately shaped products can be obtained with minimal springback, when stretch deformation is added to the bending deformation of ...

Effect of retained austenite characteristics on V-bending in ultrahigh-strength TRIP-aided steel sheets with bainitic ferrite matrix (TBF steel) was investigated for automotive applications. tests were performed a servohydraulic testing machine at processing speed 1 mm/min using 88-degree V-punch (2.0 mm punch radius), V-die (12 die gap, 0.8 shoulder and rectangular specimen (50 length, 5 width...

We study the quasistatic penetration of a flexible beam into a two-dimensional dense granular medium lying on a horizontal plate. Rather than a buckling-like behavior we observe a transition between a regime of crack-like penetration in which the fiber only shows small fluctuations around a stable straight geometry and a bending regime in which the fiber fully bends and advances through series ...