ASTM E345 covers the tensile testing of metallic foil at room temperature. Measurements of tensile strength and elongation are crucial when comparing the performance of different alloys as well as during product development and QA.

When to Use ASTM E345

ASTM E345 differs from other metal tensile testing standards in that it is designed to be used with thin, delicate specimens. Unlike ASTM E8/E8M, ASTM E345 allows specimen thickness to be determined by weight, in order to avoid damaging fragile specimens. Also, it permits elongation to be measured from crosshead displacement in instances when a contacting extensometer could damage the specimen or affect test results.

Extensometers

Both contacting and non-contacting extensometers meet the accuracy requirements of ASTM E345. In some cases, clip-on extensometers and crosshead displacement can be used for strain measurement.