Sheet metal bulging test device and method capable of realizing continuous rotation of stress main shaft

• Main Authors: LIN YANLI, ZHU HAIHUI, CHEN KELIN, HE ZHUBIN, YU XIUJIAN, YUAN SHIJIAN, HU XINYU
• Format: Patent
• Language: Chinese; English
• Published: 14.07.2023
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

The invention belongs to the field of performance test of a metal sheet under a complex nonlinear loading condition, and provides a metal sheet bulging test device and method capable of realizing continuous rotation of a stress main shaft. By changing the axial length ratio value and the long and short axis direction of the ellipse of the cross section of the upper die of the rotary female die, the constraint boundary condition of the pole of the metal sheet in the bulging process is changed, so that the change of the direction and magnitude of in-plane primary and secondary stress at the pole of the metal sheet during bulging is realized. By means of the device and method, the precise constitutive model of the metal sheet can be established under the condition closer to the actual forming process; the stress main shaft direction rotation path, the size change path and the initial included angle between the metal sheet material direction and the stress main shaft direction can be adjusted according to actual