Fuel cell bipolar plate forming limit measuring die, testing method and application thereof

The invention relates to the technical field of micro-scale material forming limit, in particular to a fuel cell bipolar plate forming limit measuring die, a testing method and application thereof. The fuel cell bipolar plate forming limit measuring die comprises an upper die, a pressing plate, a lower die and a punch, the pressing plate is arranged between the upper die and the lower die, the punch is fixed to the upper die, a lead hole is formed in the center of the pressing plate, positioning holes corresponding to each other are formed in the lower portion of the pressing plate and the upper portion of the lower die, and positioning sleeves for positioning a sample are installed in the positioning holes; a through hole is formed in the center of the lower die; the upper die comprises an upper part and a lower part which are detachably connected; a spring is arranged between the lower part of the upper die and the pressing plate, and a spring is also arranged between the pressing plate and the lower die; a