The prediction of crack propagation in coarse grain RR1000 using a unified modelling approach

Abstract

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The effect of phase angle on crack growth mechanisms under thermo-mechanical fatigue loading

“…This fact is supported by the evaluation of the fracture surface which shows a clear transgranular crack propagation as demonstrated in Figure 10. As is shown in [24], by evaluation of the numerical results, creep crack growth occurs, but only during short time intervals, where temperature and stress intensity factors support creep propagation. However, this contribution is more than 100 times smaller when compared to the fatigue crack growth, the creep effects in OP testing are negligible.…”

“…Further details of the methodology are provided in an alternative publication [24]. Figure 14 shows the prediction of crack growth for a single OP test (left) and IP test (right).…”

Grain-level residual stress distribution at dwell fatigue crack tips in a nickel-based superalloy

“…These results are in agreement with the crack growth rate data (Figure 1), which show pronounced crack growth retardation for the SC sample, with a growth rate approximately 24 times slower than the FC sample at the point of interruption (ΔK=23.6 MPa√m). This indicates the presence of a larger creep zone in the SC sample, presumably due to the difference in morphology and size distribution of γ' precipitates in both samples, which is known to affect creep and plastic deformation [26,27]. This extended creep zone logically results in an extended zone of residual compressive stress after unloading, as observed in Figure 5a.…”

DevTMF – Towards code of practice for thermo-mechanical fatigue crack growth

“…Currently, a work at the universities is focused on characterisation of tertiary ´ precipitates, their size and distribution variations in all the IP specimens. The main hypothesis is that tertiary ´ size and volume fraction are responsible for difference in the TMF IP crack growth rates, namely smaller size and lesser amount of tertiary ´ precipitates are associated with higher crack growth rates [19]. Crack growth rates can be affected by compressive stress states at pre-cracking due to load history effects that influence subsequent fatigue crack growth test data [20].…”