scope:

Application

This procedure describes the method for bend testing aluminum sheet with a semi-guided wrap bend test fixture and the analysis of test results. A standard bend test specimen of sheet is bent over the radius of a mandrel by a roller rotating about the mandrel. The resulting convex surface of the bend is rated as a function of the amount of damage incurred due to bending about the mandrel. Bend rating and maximum acceptable r/t (radius / sheet thickness) shall be prescribed in the material specification. This test procedure shall be used to identify the maximum mandrel producing the prescribed bend rating. Results are quantified in terms of the bend radius divided by the sheet thickness and shall be denoted as r/t_{(prescribed rating #)}.