Why standard testing setups fail
Tailored blanks increasingly consist of sheets with varying thickness and material properties. Height offsets occur at the transitions between sheets (weld seam), causing the test specimen not to lie flat in the cupping tool and resulting in asymmetric force application.
Consequently, deformation behavior and fracture patterns are geometrically distorted, making a valid assessment of the weld seam’s actual strength impossible.
The solution: Automatic height compensation
ERICHSEN’s automatic height compensation was specifically designed to completely eliminate geometrically induced disturbances in the seam area. The system automatically compensates height differences between sheet thicknesses and ensures uniform load distribution on the test specimen.
You benefit from reproducible cupping values independent of varying material thicknesses and a realistic assessment of forming behavior.
Testing Principle of the Automatic Height Compensation
Tested sheet metals
The sample sheets shown are from actual tests and display typical seam deformations and crack formations after testing. They clearly illustrate how weld seams and material zones behave under defined test conditions.
ERICHSEN Testing Equipment
ERICHSEN Sheet Metal Testing Machines are suitable for a large number of forming tests (Erichsen cupping tests, Deep drawing tests, Bulge tests, FLC tests, etc.).
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