公开(公告)号：US3636758A

公开(公告)日：1972-01-25

申请号：US3636758D

申请日：1970-04-20

Applicant: ALUMINUM CO OF AMERICA

Inventor： MCKEE FRANCIS G ,  HADDON ROGER C

IPC: G01N3/20

CPC classification number: G01N3/20

Abstract: A device for testing the effect of forming forces on the surface of or on a coating applied to a formable material, the device including two spaced-apart means for clamping the material, and a radius corner means located in a fixed position between the two clamping means in substantial alignment therewith. On each side of the corner means is disposed a structure providing cam surfaces located in a fixed radial relationship to the corner means. At least one of the clamping means is provided with cam following means disposed to engage the cam surfaces. When the movable clamping means is moved along the extent of the cam surfaces, with a test piece of the formable material tightly clamped between the clamping means, the test piece is bent and elongated in the manner encountered in a forming operation in which the material undergoes a substantial amount of stretching while being subjected to a substantial bend.