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.

本数据集收录了常用于汽车制造领域的铝合金Surfalex HF（AA6016A）的中岛成形试验数据。
本次试验共设置6种试样形状：颈缩宽度分别为10 mm、20 mm、40 mm、60 mm、120 mm的试样，以及完整圆盘试样，用于研究不同应力状态下的成形特性。试验前，所有试样均经过清洁处理，并喷涂白色底漆与黑色散斑图案，以辅助三维表面位移测量。为防止试验过程中试样发生滑移，施加了200 kN的夹紧力。所有试验均采用直径100 mm的半球形冲头，冲头进给速度恒定为1 mm/min；同时使用石墨润滑剂以降低试样与冲头间的摩擦。
试验过程中通过GOM-ARAMIS软件记录图像数据。前50个采集阶段的采样频率设为2 Hz，随后提升至20 Hz直至试样断裂，以此在应变率开始上升的局部化阶段获取更多信息。每种试样几何形状均开展了3次重复试验。本数据集未包含原始图像文件。
本数据集采用GOM Correlate Professional 2019软件完成立体相关分析，分析时设置的子集尺寸为19像素，步长为16像素。依据ISO 12004标准，从垂直于裂纹方向、间距为2 mm的三条等距平行直线中提取主真实应变与次真实应变。该三条直线在数据集中分别标记为"Section zero"、"Section one"与"Section two"。