Figure 13
The Wohler curve graph illustrates fatigue performance of horizontal 2024 alloy samples tested with E C O, F A S T, and H D parameters. The stress amplitude, denoted as sigma, decreases with increasing load cycles. The E C O curve is marked in blue with mean absolute error equals 10.47, the F A S T curve in orange with mean absolute error equals 7.15, and the H D curve in green with mean absolute error equals 10.84. The fitted equations are y equals 1686.3 x raised to power negative 0.178, y equals 1407.3 x raised to power negative 0.161, and y equals 1358.8 x raised to power negative 0.164 for E C O, F A S T, and H D respectively. Horizontal samples show endurance strengths of 117.45 mega pascal for F A S T, 108.27 mega pascal for both E C O and H D, indicating similar performance at higher cycles. A geometry schematic of mini-samples is provided for reference.Comparison of the S-N curves of three different parameter sets ECO, FAST and HD in horizontally manufactured Aluminium 2024-RAM2C samples
Source: Authors’ own generation