Study on Fatigue Life Evaluation Using Small Specimens for Testing Neutron-Irradiated Materials

Nogami, Shuhei; Itoh, Takamoto; Sakasegawa, Hideo; Tanigawa, Hiroyasu; Wakai, Eiichi; Nishimura, A.; Hasegawa, Akira

doi:10.1080/18811248.2011.9711679

Cited by 13 publications

(7 citation statements)

References 19 publications

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“…Sub-size standard specimens have been used to determine low cycle fatigue life for steels 155,157,171,205 and nickel alloys. 124,125 All tests were done with fully reversible loading.…”

Section: Low Cycle Fatigue Lifementioning

confidence: 99%

“…Round bar specimens (Figure 8(b)) were not sensitive to size effects, while hourglass specimens (Figure 8(c)) were. 155,157 Surface roughness was an important factor to control for, 205 however useful recommendations are lacking in the literature. Overall small specimens seem to be suitable for determining low cycle fatigue life, however size effects need to be considered when interpreting the results.…”

Section: Low Cycle Fatigue Lifementioning

confidence: 99%

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Small specimen techniques for estimation of tensile, fatigue, fracture and crack propagation material model parameters

Kazakeviciute

Rouse

Focatiis

et al. 2021

The Journal of Strain Analysis for Engineering Design

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Small specimen mechanical testing is an exciting and rapidly developing field in which fundamental deformation behaviours can be observed from experiments performed on comparatively small amounts of material. These methods are particularly useful when there is limited source material to facilitate a sufficient number of standard specimen tests, if any at all. Such situations include the development of new materials or when performing routine maintenance/inspection studies of in-service components, requiring that material conditions are updated with service exposure. The potentially more challenging loading conditions and complex stress states experienced by small specimens, in comparison with standard specimen geometries, has led to a tendency for these methods to be used in ranking studies rather than for fundamental material parameter determination. Classifying a specimen as ‘small’ can be subjective, and in the present work the focus is to review testing methods that utilise specimens with characteristic dimensions of less than 50 mm. By doing this, observations made here will be relevant to industrial service monitoring problems, wherein small samples of material are extracted and tested from operational components in such a way that structural integrity is not compromised. Whilst recently the majority of small specimen test techniques development have focused on the determination of creep behaviour/properties as well as sub-size tensile testing, attention is given here to small specimen testing methods for determining specific tensile, fatigue, fracture and crack growth properties. These areas are currently underrepresented in published reviews. The suitability of specimens and methods is discussed here, along with associated advantages and disadvantages.

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“…Sub-size standard specimens have been used to determine low cycle fatigue life for steels 155,157,171,205 and nickel alloys. 124,125 All tests were done with fully reversible loading.…”

Section: Low Cycle Fatigue Lifementioning

confidence: 99%

Section: Low Cycle Fatigue Lifementioning

confidence: 99%

Small specimen techniques for estimation of tensile, fatigue, fracture and crack propagation material model parameters

Kazakeviciute

Rouse

Focatiis

et al. 2021

The Journal of Strain Analysis for Engineering Design

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“…Służą one prowadzeniu badań mechanicznych materiałów elementów o niewielkich wymiarach, np. prętów [1], [2]. Podobnie jak próbki większych rozmiarów, mikro-próbki poddawane są obciążeniom zmęczeniowym [1].…”

Section: Wprowadzenieunclassified

“…Próbki klepsydryczne mogą również służyć określaniu różnic w zachowaniu materiału, wskutek wysokoczęstotliwościowego sygnału obciążenia, w stanie dostawy i po przetopieniu [6]. Jak wykazały rezultaty prób zmęczeniowych autorów pracy [1], [2], wpływ rozmiaru mikro-próbek z rys. 3 na liczbę cykli do zniszczenia materiału był niewielki.…”

Section: Wprowadzenieunclassified

Zastosowanie Klepsydrycznej Próbki Rurkowej Do Wyznaczania Właściwości Mechanicznych Materiałów Konstrukcyjnych

Szymczak¹,

Kowalewski²

2021

ZN PRz Mechanika

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W pracy zamieszczono wyniki badań statycznych i zmęczeniowych z prób przeprowadzonych na stali P91 z wykorzystaniem rurkowej cienkościennej mini-próbki klepsydrycznej. Zaprezentowano charakterystyki rozciągania i skręcania badanego materiału oraz wyznaczone na ich podstawie parametry mechaniczne. Przedstawiono wpływ rodzaju sterowania maszyną wytrzymałościową (sygnał przemieszczenia, odkształcenia lub naprężenia) na zachowanie materiału, w postaci jego odpowiedzi ilustrujących zmiany amplitudy naprężenia, odkształcenia i pętli histerezy. Zaprezentowano różnice w liniach ograniczonej wytrzymałości zmęczeniowej, wynikające z zastosowania obciążenia w postaci cyklicznie zmiennego odkształcenia i naprężenia.

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“…Fatigue studies are crucial in many engineering fields and especially in the design of nuclear reactors because of the temperature and neutron flux cycles they are subjected to [101,102].…”

Section: Other Applicationsmentioning

confidence: 99%

The role of small specimen creep testing within a life assessment framework for high temperature power plant

Morris

Cacciapuoti

Sun

2017

International Materials Reviews

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The safe operation of components operating at high temperature and pressure faces numerous challenges associated with ageing materials and maintaining commercial viability whilst economies transition to a lower carbon future as part of their climate change commitments. Due to these challenges the plant operator faces increasing pressure to ensure that any capital or operational expenditures are optimised and must ensure that they duly recognise plant age, condition, operating regime and ultimately the planned closure date.This review, for the first time, describes how small specimen creep testing can be applied within a practical and deployable life assessment framework and in conjunction with other assessment techniques. The current state of the art for small specimen creep testing is critically reviewed; this also includes a review of traditional techniques used on site for the metallurgical assessment of material condition, with examples from site investigations and assessment campaigns in both conventional and nuclear plant applications.In order to enhance the current practice for assessing the condition of creep ageing components this review proposes the more proactive use of small specimen testing methods for the in-service condition assessment of power plant materials, notably earlier in the plant lifecycle and within a holistic life assessment framework. This is intended to provide a means of calibrating the time dependent response of the component or system being monitored, thereby providing a key reference in-service strain rate measurement, or material property evaluation, that can subsequently be used with other traditionally deployed assessment methods to define a more targeted and cost-effective forward inspection plan. The review describes how small specimen creep testing methods and other complementary tools can be use in a new and structured approach to life management.The current status of small specimen testing methods, for both conventional and nuclear applications, is described along with a detailed discussion on current practice for in-service creep life assessment, with a case study used to illustrate the main principals. A case study is presented for ageing CMV (0.5%Cr0.5%Mo0.25%V) main steam pipework due to the extensive amount of through life data available, which highlights the particular challenges associated with the interpretation of various types of site outage inspection data, in conjunction with on-load plant operational data. The current approach to the assessment of component condition follows well established inspection based practices defined in various industry good practice guides, with expert elicitation and experience used to judge the condition of the component, system and operational risk on return to service.This review proposes a new approach to the holistic life assessment of high temperature plant, with a particular emphasis on more proactive use of small specimen testing. In addition, the review has 2 highlighted other aspects of the current approach to in-...

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Study on Fatigue Life Evaluation Using Small Specimens for Testing Neutron-Irradiated Materials

Cited by 13 publications

References 19 publications

Small specimen techniques for estimation of tensile, fatigue, fracture and crack propagation material model parameters

Small specimen techniques for estimation of tensile, fatigue, fracture and crack propagation material model parameters

Zastosowanie Klepsydrycznej Próbki Rurkowej Do Wyznaczania Właściwości Mechanicznych Materiałów Konstrukcyjnych

The role of small specimen creep testing within a life assessment framework for high temperature power plant

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