Investigation of bending fatigue-life of aluminum sheets based on rolling direction

High-cycle fatigue (HCF) and low-cycle fatigue (LCF) fatigue lives of rolled AA1100 and AA1050 aluminum sheets along different directions were evaluated at room temperature. Four types of samples denoted as longitudinal (L) and transverse (T) to the rolling direction were compared because the samples along the two typical directions show an obvious anisotropy. A cantilever plane-bending and multi-type fatigue testing machine was specially designed for this purpose. Deflection-controlled fatigue tests were conducted under fully reversed loading. The longest fatigue lives in the LCF region were obtained for AA1050 (L) while AA1100 (L) samples had the longest fatigue lives in the HCF region.