Figure 14
The Wohler curve graph compares fatigue response of vertical 2024 alloy samples tested using E C O, F A S T, and H D parameters. Stress amplitude decreases with cycle count, revealing differences between processes. The E C O curve in blue has mean absolute error equals 16.47, the F A S T curve in orange has mean absolute error equals 9.46, and the H D curve in green has mean absolute error equals 15.61. Fitted regression lines are y equals 477.09 x raised to power negative 0.069 for E C O, y equals 497.72 x raised to power negative 0.058 for F A S T, and y equals 512.91 x raised to power negative 0.061 for H D. Endurance strengths measured are 158.21 mega pascal for E C O, 203.44 mega pascal for F A S T, and 200.17 mega pascal for H D. The F A S T and H D processes exhibit superior high-cycle fatigue performance compared to E C O. A schematic of mini-sample geometry accompanies the graph.Comparison of the S-N curves of three different parameter sets ECO, FAST and HD in vertically manufactured Aluminium 2024-RAM2C samples
Source: Authors’ own generation