Tensile test data of a 9 microns thick aluminium foil

Material testing data from tensile tests performed on an aluminium AA8079 alloy. The specimens are 100mm long and have a cross section of 10x0.009mm^2. Specimens are cut tested in 0°, 10°, ...40°, 45°, 50°, 60°, ....90° clock wise to the direction of rolling during manufacturing of the foil. Unfortunately the precise meaning of "clock wise" vis á vis the rolling direction and side of the foil is not known but is consistent in this text. The naming of the files reveal the direction of the test and the specimen no. for the respective direction, e.g "45_RawDataySpecimen_2" is to the second specimen tested in a direction 45° clock wise to the rolling direction. The tests are described in detail in B. Käck & C. Malmberg, Master thesis: Aluminium foil at multiple length scales, mechanical tests and numerical simulations in abaqus (2015), div. of Solid Mechanics, Lund Institute of Technology, Sweden. The tests were evaluated in "On the stiffness tensor in AA8079 at small and intermediate strains" by E. Andreasson, W. Reheman, P. Ståhle and S. Kao-Walter, submitted for publication. The major discoveries were that 1) plastic deformation appear almost immediately, i.e., practically at zero load, 2) the compliances increase linearly with strain, from the value of the inverse elastic modulus to almost five times that 3) principal material directions are not along the rolling direction but rather 5° to 15° anti-clock wise from the rolling direction and finally 4) there is a minimum stress in the region of between 35° to 45° clock wise from the rolling direction and for symmetry reasons also at 55° to 65° in the anti-clock wise direction.本数据集为AA8079铝合金的拉伸试验材料测试数据。试验试样全长100mm，横截面尺寸为10×0.009mm²。所有试样均按与箔材轧制方向呈顺时针0°、10°……40°、45°、50°、60°……90°的角度切割后开展测试。遗憾的是，目前尚不明确“顺时针方向”相对于轧制方向与箔材面的准确定义，但本数据集内的表述保持统一。文件名可体现试验角度与对应角度下的试样编号，例如文件"45_RawDataySpecimen_2"对应与轧制方向呈45°顺时针方向的第2个试样。 该试验的详细信息可参见B. Käck与C. Malmberg于2015年发表的硕士学位论文"多尺度铝合金箔材：Abaqus中的力学测试与数值模拟"，作者隶属于瑞典隆德理工学院固体力学系。 相关试验的分析工作见于E. Andreasson、W. Reheman、P. Ståhle与S. Kao-Walter合著的"AA8079合金小与中等应变下的刚度张量"一文，该文目前已提交待刊。本次研究的主要发现包括：1）塑性变形几乎瞬时发生，即几乎在零载荷下即出现塑性变形；2）柔量随应变呈线性增长，从弹性模量的倒数提升至其近5倍；3）材料主方向并非沿轧制方向，而是相较于轧制方向呈5°至15°的逆时针方向；4）在与轧制方向呈35°至45°顺时针的区域存在应力最小值，基于对称性原理，在逆时针55°至65°的区域同样存在应力最小值。