PSI - Issue 68

T. Korschinsky et al. / Procedia Structural Integrity 68 (2025) 1196–1202 Korschinsky et al./ Structural Integrity Procedia 00 (2025) 000–000

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value, which translates to the requirement of a stabilized material state of the material behavior. Additionally, when calibrating the functions to test data, a starting point at yield stress at zero plastic strain is required as a boundary condition, which decreases the fit even further for the calibration functions of EN AW-1050A H24. The plots of the calibration functions and more detailed explanations on the reasons for the low agreement in Figure 6 are given in (Korschinsky, et al., 2024). 3.3. Modelling of the cyclic transient material behavior using DD3M Figure 6 (b,d,f) shows the hysteresis loops simulated using the DD3M, also for a strain amplitude of 0.6 %, 0.4 % and 0.2 % and . =−1 . While the hysteresis loops still have some degree of mismatch at the transition from the linear elastic to the elastic-plastic region, the overall shape of the loops and the location of the reversal points are met significantly better compared to the Chaboche model.

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Figure 6: Hysteresis loops simulated with the Chaboche combined hardening model (a,c,e) and the DD3M (b,d,f) for 0.6 % (a,b), 0.4 % (c,d) and 0.2 % (e,f) of total strain