Cyclic softening behaviour of a P91 steel under low cycle fatigue at high temperature

A dislocation-based model for high temperature cyclic viscoplasticity of 9–12Cr steels

“…Larger particles result in a weaker material, as the particle spacing is increased, viz. equation (10), assuming constant f j . For example, increasing r j from 15 nm to 90 nm causes a 19.5 % reduction in cyclic strength for M 23 C 6 precipitates.…”

Simulation of the fatigue behaviour of a power plant steel with a damage variable

“…All these stress components are curved fitted to equations (5) and (6) Table 2. However, further optimisation procedures are still needed to accurately fit the experimental data.…”

“…Saad et.al. [6] used this model to predict the initial stress amplitude evolution under strain-controlled uniaxial fatigue tests at high temperature. However, it is also important to predict the component lifetime as well as the failure site.…”

“…Cracks and voids would significantly influence the cyclic stress-strain response. Following on the previous studies [6,7], the Chaboche model was employed in this study to investigate the cyclic visco-plasticity behaviour in the full cycle fatigue life.…”

Effective determination of cyclic-visco-plasticity material properties using an optimisation procedure and experimental data exhibiting scatter

“…Note that, with the drag stress differential in this form, only primary behaviour (either hardening or softening) can be represented (see Figure 3). Modifications exist to extend the applicability of the Chaboche model to the secondary behaviour region [14], however this is considered outside the scope this paper. The drag stress will undergo some initial monotonic increase before reaching a stabilised asymptotic value [3,11,12] (see Figure 4).…”