Extrapolation of creep strain and rupture data

Penny, R. K.; Marriott, D. L.

doi:10.1007/978-94-011-0561-3_6

Cited by 5 publications

(5 citation statements)

References 3 publications

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“…The first difficulty that arises from ACT is that few material data of up to 100,000 h are available for even the established material [ 36 ]. Therefore, it is necessary to extrapolate from data obtained from much shorter tests (i.e., from 1000 to 10,000 h) for life prediction purposes.…”

Section: Proposed Methodologymentioning

confidence: 99%

“…Therefore, it is necessary to extrapolate from data obtained from much shorter tests (i.e., from 1000 to 10,000 h) for life prediction purposes. There are three main groups of extrapolation techniques [ 36 ]: Parametric method, which is the most used method for high-temperature components in the power industry; Graphical method (theoretical and empirical), but not widely employed; Algebraic method, although little advancement of this method for extrapolation of creep test data was observed over the years; …”

Section: Proposed Methodologymentioning

confidence: 99%

“…Three classes of parameters are categorized in the parametric method [ 36 ]: time–temperature (t, T), stress-modified (t, T), and time–stress (t, T) parameters. The first two parameters are closely related, and both represent the dominant part of the work conducted in the field.…”

Section: Proposed Methodologymentioning

confidence: 99%

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Residual Creep Life Assessment of High-Temperature Components in Power Industry

Pivdiablyk¹,

Goh²,

Chye³

et al. 2023

Sensors

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A large percentage of power, petroleum, and chemical plants over the world were in operation for a long duration with the corresponding critical components being used beyond the design life of 30 to 40 years. It is generally more cost-effective to refurbish or modernize the degraded equipment or components, rather than to construct a new plant. Therefore, a reliable plant life extension assessment that can evaluate the critical components is needed. The key element in plant life extension is the residual life assessment technology. However, at present, there is still no general consensus among the industry players on the approach to adopt when performing residual life assessment for such a critical damage mechanism as creep. In this article, a three-level residual life assessment methodology is proposed as a general approach for high-temperature components prone to creep. A detailed validation of the selected guidelines and calculation models is also described. Eventually, an application of the three-level methodology to a real industrial case study is presented.

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Section: Proposed Methodologymentioning

confidence: 99%

Section: Proposed Methodologymentioning

confidence: 99%

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Residual Creep Life Assessment of High-Temperature Components in Power Industry

Pivdiablyk¹,

Goh²,

Chye³

et al. 2023

Sensors

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“…Unfortunately however in a practical situation a relation is not likely to be known, the distribution of creep strains in the three orthogonal directions being dictated by the deviatoric stress [Penny & Marriott, 1995].…”

Section: A Biaxial Stress Inversionmentioning

confidence: 99%

“…The assessment method most frequently used in the power industry is that of replica metallography, a process that amongst other technical issues is inherently laborious; around 15,000 such replicas take place in each power station each year. The strain and strain rate develop throughout the entire life of the component and are useful to inform time to failure calculations [Penny & Marriott, 1995]. Strain is very commonly studied in creep research yet existing strain monitoring techniques rely on 'off-load' measurements resulting in potentially infrequent inspection intervals.…”

Section: Introductionmentioning

confidence: 99%

A potential drop strain sensor for in-situ power station creep monitoring

Corcoran¹,

Cawley²,

Nagy³

2014

AIP Conference Proceedings

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Creep is a high temperature damage mechanism of interest to the power industry and at present lacks a satisfactory inspection technique. Existing material inspection techniques are extremely laborious while strain measurements rely on often infrequent off-load measurements. A quasi-DC directional potential drop technique has been suggested that is able to suppress the effects of permeability and is primarily sensitive to changes in resistivity and also the geometry that will develop through strain. The change in creep related resistivity is shown by an equivalent effective resistivity approach to be small at <2% change when compared to the >100% change in transfer resistance that occurs due to strain as observed in laboratory tests. A biaxial inversion is then presented and demonstrated on in-lab samples showing good performance. The result is a sensor that performs as a very robust high temperature strain gauge.

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