An evaluation of the capability of data conversion of impression creep test

Cacciapuoti, B.; Sun, Wei; McCartney, D.G.; Morris, A.; Lockyer, Scott; Razak, Norhaida Ab; Davies, Catrin M.; Hulance, J.

doi:10.1080/09603409.2017.1346747

Cited by 7 publications

(2 citation statements)

References 16 publications

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“…Impression creep tests have produced results in agreement with uniaxial tests of similar materials [20,21]. Importantly, extrapolation of the MSR to plant stress levels confirms the slow rate of degradation observed from the limited operational data available and detailed examination of the parent material.…”

Section: Discussionsupporting

confidence: 64%

Correlation and capability of using site inspection data and small specimen creep testing for a service-exposed CrMoV pipe section

Cacciapuoti

Morris

Sun

et al. 2018

Materials at High Temperatures

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This paper presents for the first time an investigation on the creep damage evolution of an exservice CrMoV pipe section through impression creep test and metallurgical inspection data.The study emphasises the importance of correlating the operating conditions (temperature and stress) of power plant components with the results from metallurgical examinations and small specimen creep tests.The paper seeks for a correlation among micro-and macro-hardness measurements, surface replicas data and minimum creep strain rates (obtained by impression creep tests) of the parent material of the pipe section. Also, optical and SEM micrographs have been used to assess possible metallurgical differences through the thickness of the pipe section. This investigation shows how miniature creep test specimen data could be practically used in a holistic approach for the evaluation of life consumption of power plant components and concludes that the studied parent material could have been retired from service too early.

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Section: Discussionsupporting

confidence: 64%

Correlation and capability of using site inspection data and small specimen creep testing for a service-exposed CrMoV pipe section

Cacciapuoti

Morris

Sun

et al. 2018

Materials at High Temperatures

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“…In this study, a square-shaped specimen and a flat-ended rectangular indenter are used, which are recommended in the previous study 12 and have been extensively used in practices. 15,16 During the impression creep test, the obtained time history of displacement can reflect the creep properties of the material which is immediately adjacent to the indenter. 5 As shown in Figure 2, a reasonably accurate steady-state creep deformation rate can be obtained in the ICT.…”

Section: Indenter Misalignment In Impression Creep Testmentioning

confidence: 99%

Indenter misalignment in impression creep test: Uncertainty, correction and recommendation

Deng

Sun

2021

The Journal of Strain Analysis for Engineering Design

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The impression creep test (ICT) method, as a miniature specimen test technique, has been used extensively to determine the in-service creep properties of power plant components. However, the experiment results of the ICT can be affected by some uncertainties associated with the inaccuracies of measurement, which have not been studied before. This paper presents some results of finite element analyses, to evaluate the effect of indenter misalignment on the results of the ICT, such as the steady-state creep deformation rate and the conversion parameters. The results obtained have shown that the angular misalignments of the indenter around horizontal directions have a relatively significant influence on the conversion parameters, and the misalignment around vertical direction has a much less significant effect. Empirical formulas were developed for the possible correction of the conversion factors. Finally, some recommendations on the control of the indenter and specimen alignment were given.

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