Simple modelling of the constitutive behaviour of a 1%CrMoV rotor steel in service-like thermo-mechanical fatigue tests

Colombo, F.; Masserey, Bernard; Mazza, Edoardo; Holdsworth, S.R.

doi:10.3184/096034002783640369

Cited by 4 publications

(4 citation statements)

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“…using t R (σ( N ), T ). D cr2 is determined using the appropriate rupture time curve but compensating for stress reduction due to softening by entering the time‐to‐rupture line with an amplified stress value: t R (σ( N )/Z( N ), T ), where Z ( N ) is the current cyclic creep‐softening factor determined from the evolution of hold time relaxation behaviour, and ranges from 1 to 0.77 11 …”

Section: Local Endurance Analysismentioning

confidence: 99%

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Factors influencing the service‐like thermomechanical fatigue test cycle endurance of 1% CrMoV rotor steel

Masserey

Colombo

Mazza

et al. 2003

Fatigue Fract Eng Mat Struct

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Service‐like thermomechanical fatigue tests have been performed in order to characterize the endurance of 1% CrMoV rotor steel under such transient thermal conditions. The key features of these tests are low strain rates (≤10−5 s−1) and longer hold periods. In all testpieces, ratcheting with progressive section reduction is observed in the central portion of the gauge length accompanied by local amplification of the strain range. The finite‐element‐based analysis of this phenomenon allows the measured endurances to be rationalized with those determined from isothermal tests. Post‐test inspection has revealed the development of two concurrent damaging mechanisms in the testpieces: (i) fatigue at the surface and (ii) creep in the interior. Different methods of damage calculation for creep–fatigue interaction are applied and compared in their predictive capabilities.

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Section: Local Endurance Analysismentioning

confidence: 99%

“…Damage summation diagram.rupture line with an amplified stress value: t R (σ (N )/Z(N ), T), where Z(N ) is the current cyclic creep-softening factor determined from the evolution of hold time relaxation behaviour, and ranges from 1 to 0.77 11. Fatigue and creep damage are evaluated using the damage summation diagram shown inFig.…”

mentioning

confidence: 99%

Factors influencing the service‐like thermomechanical fatigue test cycle endurance of 1% CrMoV rotor steel

Masserey

Colombo

Mazza

et al. 2003

Fatigue Fract Eng Mat Struct

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“…'elastic.txt' and 'plastic-C/H.txt'). The adopted creep constitutive model was the stressregime and temperature dependent development of the 'Chracteristic Strain' model, 22 implemented assuming creep softening due to cyclic plasticity, 28,29 and primary creep persistency. 25 The creep softening factor was determined by comparing cycle-one and mid-life cycle hold time stress relaxation characteristics.…”

Section: %Cr Steelmentioning

confidence: 99%

“…25 The creep softening factor was determined by comparing cycle-one and mid-life cycle hold time stress relaxation characteristics. 28,29 Using a very similar method to the one explained in the previous section, it is possible to determine the most representative set of x 17-20 values (Table 1). Figure 6 shows the optimised g sY , g C values as a function of temperature for the 10%Cr steel under investigation.…”

Section: %Cr Steelmentioning

confidence: 99%

Temperature dependent representation for Chaboche kinematic hardening model

Hosseini

Holdsworth

Kühn

et al. 2014

Materials at High Temperatures

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The assessment of high temperature components under cyclic deformation conditions increasingly relies on determinations of the stress-strain state at the critical location using nonlinear finite element analysis. An important consideration in such finite element simulations is the used constitutive model. The Chaboche model has been widely accepted as an advanced model for such applications. This study evaluates the variation of Chaboche model parameters with temperature for low cycle fatigue conditions and introduces an approach to systematically calibrate the model for a range of temperatures, rather than for single temperatures. Furthermore, mathematical representations have been proposed to consider the effect of superimposed creep deformation on the Chaboche model parameters. Successful application of the proposed approach/formulation for representing the behaviour of a 10%Cr steel under low cycle fatigue and cyclic/hold deformation conditions for the temperature range of 20-625uC is presented.

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