PSI - Issue 43

Atri Nath et al. / Procedia Structural Integrity 43 (2023) 246–251 Author name / Structural Integrity Procedia 00 (2022) 000 – 000

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f Figure 3: Prediction of stabilized hysteresis loops and ratcheting behaviour for FCC structured (a-b) AA7075 alloy(Nath et al., 2019b), and (d-e) OFHC copper (Nath et al., 2022). (e) and (f) represent the deviation of simulation from experimental for the two materials using F error

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d f Figure 4: Prediction of stabilized hysteresis loops and ratcheting behaviour for FCC structured (a-b) TA16 alloy (Nath et al., 2019b), and (d-e) Zr-4 alloy at 400 o C (Nath et al., 2019b). (e) and (f) represent the deviation of simulation from experimental for the two materials using F error backstress component, and in particular the threshold term ( a 4 ) of the KH is substantially larger for closely packed HCP materials; this indicates that the backstress evolution in the investigated materials is primarily linear (Fig. 5c). For loosely packed BCC materials, the rapidly stabilizing first backtress component and the primarily non-linear second backstress component are active (Fig 5a-b). The backstress evolution of the investigated FCC alloys is also heavily influenced by the fourth backstress component, similar to HCP materials, although lower in magnitude than the later. The kinematic hardening (KH) component represents the rapid changes in the dislocation structure (Chaboche, 1986); the KH physically represents the monotonic rapid evolutions of the remobilization of dislocation e