Apparatus for evaluating plane strain stretch formability,...

Details Apparatus for evaluating plane strain stretch formability,... Apparatus for evaluating plane strain stretch formability,...

G - Physics

01

N

G01N 3/28 (2006.01) G01N 3/02 (2006.01)

Patent

CA 2129965

2129965 9416307 PCTABS00033 The invention provides an apparatus and a method for evaluating the plane strain stretch formability for thin steel sheets used in automative bodies, so that manufacturing factories and stamping shops can easily evaluate the plane strain stretch formability. The apparatus includes: a lower die (10) and an upper die (9) with a lock bead (8) installed thereon. A test specimen is inserted into between the upper and lower dies (9) and (10), and is clamped by means of the lock bead (8) along the circumferential edge of said test specimen, so that the material of the test specimen should be mobilized into the upper die (9). Then a punch is elevated to apply a stretch forming force on the test specimen, and then, the plane strain stretch formability is evaluated based on the fracture limit punch height at the instant of the fracture. The punch has a saddle-like semi-cylindrical shape.

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