The plate bending test is intended to draw conclusion about the susceptibility to failure of metallic materials during bending deformation and to determine characteristic values of deformation for numerical simulation. The bending angle at the crack initiation phase is used as the characteristic data which is usually calculated from the recorded punch stroke und the geometry of the testing equipment. ThyssenKrupp Steel Europe therefore uses a new optical measurement system which is able to determine the bending angle directly at the specimen and synchronized in time with the recorded force and punch stroke. By comparison of the calculated and measured bending angles it is represented that the test results differ especially according to values beyond 90 degrees.
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