US 12,241,875 B2
Method and facility for collision performance evaluation test for metal sheet material for automobile body
Kentaro Sato, Tokyo (JP); Takayuki Futatsuka, Tokyo (JP); Tomohiro Sakaidani, Tokyo (JP); Shinsuke Komine, Tokyo (JP); and Yoshiyasu Kawasaki, Tokyo (JP)
Assigned to JFE STEEL CORPORATION, Tokyo (JP)
Appl. No. 17/311,236
Filed by JFE STEEL CORPORATION, Tokyo (JP)
PCT Filed Dec. 16, 2019, PCT No. PCT/JP2019/049189
§ 371(c)(1), (2) Date Jun. 4, 2021,
PCT Pub. No. WO2020/129903, PCT Pub. Date Jun. 25, 2020.
Claims priority of application No. 2018-235767 (JP), filed on Dec. 17, 2018.
Prior Publication US 2022/0018747 A1, Jan. 20, 2022
Int. Cl. G01N 3/20 (2006.01); G01N 3/04 (2006.01); G01N 3/06 (2006.01); G01N 3/24 (2006.01); G01N 3/307 (2006.01)
CPC G01N 3/20 (2013.01) [G01N 3/24 (2013.01); G01N 3/307 (2013.01); G01N 3/04 (2013.01); G01N 3/068 (2013.01); G01N 2203/001 (2013.01); G01N 2203/0023 (2013.01); G01N 2203/0067 (2013.01); G01N 2203/0282 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A collision performance evaluation test method for a metal sheet material for an automobile body, the method comprising:
first forming, by a press working apparatus, a flat test specimen made of a metal sheet material to be tested into a V shape having a curved portion by primary bending;
deforming, by a bending test apparatus, the test specimen that has been formed by the primary bending in a direction intersecting with a primary bending direction and after the curved portion of the test specimen formed by the primary bending is flattened, by secondary bending; and
recording and evaluating a bending load and a bending stroke for the test specimen during the secondary bending deformation, wherein
the bending load and the bending stroke are recorded and evaluated such that a stroke-load curve is output including indication of a peak point of the bending load and a fracture stroke value corresponding to the peak point.