1.1''This test method establishes the requirements for the determination of the reversed or repeated bending fatigue properties of copper alloy flat sheet or strip of spring materials by fixed cantilever, constant deflection (that is, constant amplitude of displacement)-type testing machines. This method is limited to flat sheet or strip ranging in thickness from 0.005 in. to 0.062 in. (0.13 mm to 1.57 mm), to a fatigue life range of 10⁵ to 10⁸ cycles, and to conditions where no significant change in stress-strain relations occurs during the test.

1.2''Units'''The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

1.3''The following safety hazard caveat pertains only to the test methods(s) described in this test method.

1.4''This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.