Abstract
Tension tests were carried out on two shapes of tensile specimens of A2024-T3, A7N01-T4 and A7075-T6 sheets. A-fractured elongation is generally greater than B-fractured one. Elongation evaaluted is greater than one not evaluated particularly when fracture occurs near the gage mark. Mean elongation B-fractured and evaluated is nearly equal to mean one A-fractured. This fact shows suitability of the JIS evaluation method. Even if B-fracture occurs, when the elongation not evaluated is superior to the elongation specified in the JIS, the JIS evaluation method for elongation is unnecessary in an industrial tension test.
