Nakazima measurements of Surfalex HF (AA6016A)

This dataset contains Nakazima tests of Surfalex HF (AA6016A), an aluminium alloy commonly used in automotive applications.

Six sample shapes with neck widths of 10, 20, 40, 60 and 120 mm as well as a full disk, were tested to study different stress state conditions. The samples were first cleaned and spray-painted with a white undercoating and a black speckle pattern to facilitate 3D surface displacement measurements. To ensure that the samples did not slip during testing, a clamp force of 200 kN was applied. The speed of the hemispherical punch, which had a diameter of 100 mm, was maintained at 1 mm per minute for all tests. A graphite lubricant was used to reduce friction between the sample and the punch.

Images were recorded during the tests using the GOM-ARAMIS software. The acquisition frequency was set to 2 Hz for the first fifty stages, and was then increased to 20 Hz until the samples fractured. This was done to obtain more information during the localisation phase, where the strain rate starts to increase. Three repeat experiments were carried out for each sample geometry. The raw images are not contained in this dataset.

The stereo-correlation analysis, for which we used a subset size of 19 pixels and a step size of 16 pixels, was performed using GOM Correlate Professional 2019. In accordance with the ISO 12004 standard, the major and minor true strains were then extracted from three equidistant, parallel lines, perpendicular to the crack direction and separated from each other by 2 mm. These 3 lines are labelled "Section zero", "Section one" and "Section two" in the dataset.