指定确定板材和带材在反向弯曲中承受塑性变形能力的方法。只有在事先达成协议后，才能应用于铝及其合金。反向弯曲试验包括在一端固定的矩形试件在相反方向上重复弯曲90度，每个弯曲超过规定半径的圆柱形支架。

Specifies the method for determining the ability of sheet and strip to undergo plastic deformation in reverse bending. Can be applied to aluminium and its alloys only after previous agreement. The reverse bend test consists of repeated bending through 90, in opposite directions, of a rectangular test piece held at one end, each bend being over a cylindrical support of specified radius.