A simple apparatus for measuring the ductility of metal films is described. The specimen is held rigidly between two metal plates with circular openings while a metal ball is slowly pushed upwards until the metal film ruptures. The distance the metal ball travels between the point where it first makes contact with the film and that where the film ruptures is observed. The ductility is determined from a graph which relates this distance to elongation. Reproducibility of the measurement is better than ± 10%. The apparatus is compact, portable, and simple to operate. It is recommended where a simple, yet reproducible, technique for ductility measurement is needed on a routine basis.
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