Incremental fatigue damage modeling of 7050-T7 aluminum alloy at stress-raisers

Developments of Topology Optimization Methods for Additive Manufacturing involving High-cycle Fatigue

“…Two HCF models, namely the original continuous-time model by Ottosen et al [38] and the modified version by Lindström [31], Lindström et al [33], are tested for this aluminum alloy. The fatigue parameters for the aluminum alloy fitted from Ottosen et al [38] are S 0 = 113.3 MPa, a = [1, 0.2611] T , C = 0.504, K = 5.11E − 6 and L = 2.556, while the parameters from Lindström et al [33] are C = 10, a = [501, 180] T , K = 4.09E − 6, L = 12.9 and A 22 = −12700, while the other components in A are zero. load is applied for compliance evaluation, while in the second case, a load history F (t) = F S f (t) with F = 200 N is applied for fatigue evaluation.…”

“…Using the HCF model by Ottosen et al [38], the obtained mass of the optimized beam is 0.0046 kg, as shown in Figure 9(a). Using a different HCF model proposed by Lindström [31], Lindström et al [33], the obtained mass of the optimized beam is 0.0047 kg, as shown in Figure 9(b). Both optimized profiles have a smooth radius at the reentrant corner to avoid high stress concentrations and thus prolong the component's life.…”

“…This technique is employed to expedite the overall fatigue process and sensitivity analysis, thereby enabling the handling of an unlimited number of load cycles. While in Paper IV, the fatigue model by Lindström [31], Lindström et al [33] is used, which takes a quadratic endurance function. This ensures a better prediction and extrapolation capabilities of fatigue-damage, especially for non-proportional loads.…”

“…Lindström [31], Lindström et al [33] introduced a bivariate, quadratic polynomial endurance function to the HCF model. The purpose of this function is to enhance the accuracy and extrapolation capability of the original HCF model by Ottosen et al [38], particularly for non-proportional loads.…”

“…The purpose of this function is to enhance the accuracy and extrapolation capability of the original HCF model by Ottosen et al [38], particularly for non-proportional loads. Papers I and III, used the original continuous-time HCF model by Ottosen et al [38], while Paper IV adopted the HCF model with the new endurance function introduced by Lindström [31], Lindström et al [33].…”