Repeated bending tests of metal sheets and strips

Repeated bending test is a test to measure the mechanical properties of materials when subjected to bending load. It is one of the basic methods for testing the mechanical properties of materials. The repeated bending test of metal materials can determine the ability of metal sheets and thin strips with a thickness equal to or less than 3 mm to undergo repeated bending plastic deformation.
Zhongke Inspection Reliability Experiment Center has the capabilities of environmental testing and reliability performance testing of various metal materials, and provides professional repeated bending test services for thin plates and thin strips.

1. Classification by thickness: thin plate, medium plate, thick plate, extra thick plate
2. Classification by production method: hot-rolled steel plate, cold-rolled steel plate
3. Classification according to surface characteristics: galvanized sheet, hot-dip galvanized sheet, electro-galvanized sheet, tin-plated sheet, composite steel sheet, color-coated steel sheet
4. Classified by use: bridge steel plates, boiler steel plates, shipbuilding steel plates, armor steel plates, automobile steel plates, roofing steel plates, structural steel plates, electrical steel plates (silicon steel sheets), spring steel plates, high-quality carbon structural steel plates

1. The repeated bending test is a repeated bending test in which one end of the rectangular cross-section specimen is fixed, bent 90° around a cylindrical support wheel with a specified radius, and then bent in the opposite direction.
2. The test should generally be conducted within the room temperature range of 10 ℃ ~ 35 ℃. For tests with strict temperature requirements, the test temperature should be 23 ℃ ± 5 ℃.
3. With the bending arm in a vertical position, clamp the lower end of the sample and the upper end of the sample passes through the slit of the lever. Bend the specimen 90° to the right (left) from the starting position, and then return to the starting position as the first bend. Then bend 90° to the left (right) from the starting position, and then return to the starting position as the second bend. Repeated bending is performed continuously in this order.

GB/T 235-2013 Metallic materials Thin plates and strips Repeated bending test method
ISO 7799-1985 Metallic materials. Sheets and strips of thickness equal to or less than 3 mm. Repeated bending tests
EN ISO 7799-2000 Metallic materials Sheets and strips of thickness equal to or less than 3 mm Repeated bending tests
BS EN ISO 7799-2000 Metallic materials Sheets and strips of thickness equal to or less than 3 mm Repeated bending tests
NF EN ISO 7799-2000 Metallic materials Sheets and strips of thickness equal to or less than 3 mm Repeated bending tests
DIN EN ISO 7799-2000 Metallic materials Sheets and strips of thickness equal to or less than 3 mm Repeated bending tests