ISO 7799 Metallic Materials - 3 mm or Less Thickness Sheet and Strip - Back Bend Test

Metal Test Laboratory

ISO 7799 Metallic Materials - 3 mm or Less Thickness Sheet and Strip - Back Bend Test

EUROLAB, with its state-of-the-art accredited laboratories and expert team, provides precise and fast testing services within the scope of ISO 7799 testing. Specifies the method for determining the ability of sheet and strip to undergo plastic deformation in reverse bending.

ISO 7799 Metallic Materials - 3 mm or Less Thickness Sheet and Strip - Back Bend Test

Applicable to aluminum and its alloys only after prior agreement. The reverse bend test consists of repeated bending of a rectangular test piece held at one end for 90° in opposite directions, with each bend on a cylindrical support of the specified radius.

The distance of the axis of rotation of the bending arm from the top of the cylindrical supports shall be 1,0 mm for all support sizes. The thickness of the test piece should be the thickness of the plate or strip from which the sample was taken, and the surfaces should remain intact.

The width of the machined test piece shall be between 20 and 25 mm. Smaller width strip material can be tested in full width.

The test piece should be prepared in such a way that the effect of heating and mechanical strengthening is minimized. There should be no cracks and marks on the surfaces and there should be no burrs on the edges.

Bend at a uniform speed, without impact and not exceeding one twist per second. If necessary, reduce the bending rate to ensure that the heat generated does not affect the result of the test.

During testing, some kind of restriction can be applied to ensure constant contact between the test piece and the blocks. This may be in the form of a tensile stress of not more than 2% of the value of the nominal tensile strength, unless otherwise specified in the relevant standard.

EUROLAB assists manufacturers with ISO 7799 test compliance. Our test experts, with their professional working mission and principles, provide you, our manufacturers and suppliers, the best service and controlled testing process in our laboratories. Thanks to these services, businesses receive more effective, high-performance and quality testing services and provide safe, fast and uninterrupted service to their customers.

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