Positioning device for forming limit test sample

A positioning device for a forming limit test sample belongs to the technical field of metal plate forming limit tests and comprises a rack, a female die and a blank holder, the female die and the blank holder are arranged on the rack from top to bottom, a male die is arranged under the blank holder, and a thin plate sample is placed on the blank holder. The blank holder is provided with a plurality of positioning assemblies which are arranged in a circle with the center line of the blank holder as the axis, and the positioning assemblies are rotationally positioned on the periphery of the blank holder and abut against the outer edge of the sheet sample for positioning. The test sample can be put to an accurate position in the test process, the phenomenon that a final necking or fracture part is not in an expected position due to the fact that the sample putting position deviates is reduced, and the test success rate and the FLC curve accuracy are improved. 一种成形极限试验试样用定位装置，属于金属板材成形极限试验技术领域，该定位装置，包括机架及其上由上而下设置