Numerical study of the applicability of the η-factor method to J-resistance curve determination of steam generator tubes using non-standard specimens

Bergant, Marcos Antonio; Yawny, A.; Ipiña, Juan E. Perez

doi:10.1016/j.engfracmech.2015.07.059

Cited by 11 publications

(2 citation statements)

References 22 publications

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“…Ovaj pravac izložen je dejstvu obimnog napona, dominantnog kod cilindričnih struktura izloženih unutrašnjem pritisku. U prethodnom periodu, predložena je epruveta oblika prstena za savijanje (u tri tačke) -PRNB, pipe ring notched bending [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32]. U literaturi postoje i drugi predlozi za ovaj položaj defekta, [17,18], ali po pravilu podrazumevaju složen postupak pripreme epruvete ili ispitivanja, a u nekim slućajevima i izradu i prilagođavanje pomoćnog pribora konkretnoj geometriji ispitivane epruvete.…”

Section: Uvodunclassified

Određivanje otpornosti prema lomu materijala cevovoda primenom epruveta oblika prstena

Međo

Metallurgy

Musrati

et al. 2018

Proceedings of the 31st International Congress on Process Industry

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Integritet cevovoda i drugih elemenata opreme pod pritiskom je veoma važan za pouzdan i bezbedan rad postrojenja u procesnoj industriji. Otkazi opreme mogu, uz ugrožavanje sigurnosti zaposlenih i ekonomske gubitke, u nekim slučajevima izazvati ozbiljne ekološke posledice, ukoliko dođe do ispuštanja otrovnih, zapaljivih ili na drugi način opasnih fluida. Stoga, veoma je važno poznavati ponašanje cevi pri lomu ili drugim oblicima otkaza. Problem pri korišćenju standardnih epruveta predstavlja potrebna debljina uzorka, kao posledica zahteva za dominantnim ravnim stanjem deformacije. U ovom radu, otpornost prema lomu je određena primenom epruveta oblika prstena izloženih savijanju, kao nestandardnih epruveta predloženih u prethodnom periodu. Početni koncentrator napona (žleb ili zamorna prslina) je formiran u uzdužnom pravcu; opterećenje ove epruvete simulira dejstvo unutrašnjeg pritiska u cevi. Epruvete su izrađene od cevi za primenu na povišenoj temperaturi. Rezultati pokazuju da se epruvete oblika prstena mogu koristiti za karakterizaciju loma materijala cevovoda i posuda malih prečnika, posebno za tankozidne strukture koje nisu pogodne za izradu standardnih epruveta mehanike loma (poput elemenata sistema za skladištenje i distribuciju fluida -kiseonika, vodonika, azota, vode / vodene pare, tečnih i gasovitih goriva, itd.). Ključne reči: Otkaz nosivosti cevi; Epruveta oblika prstena za savijanje; Žilav lom; Stereometrijsko beskontaktno merenje deformacijaIntegrity of pipelines and other pressurised equipment elements is very important for reliable and safe exploitation of the process industry plants. Equipment failures can, in addition to endangering the safety of personnel and economic losses, in some cases cause serious ecological consequences, if some toxic, flammable or otherwise dangerous material is released. Therefore, it is very important to understand the behaviour of the pipes during fracture or other failure modes. The problem which arises if standard specimens are applied is the required thickness of the specimen, as a consequence of the plane strain requirement. In this work, fracture resistance is determined by application of ring-shaped specimens exposed to bending, as nonstandard specimens proposed recently. Initial stress concentrator (notch or fatigue pre-crack) is formed in axial direction; loading of this specimen simulates the internal pressure in the pipe. The specimens are fabricated from the pipes for usage on elevated temperature. The results show that the ring-shaped specimens can be applied in fracture characterisation of pipeline / small-diameter vessel material, especially for thin-walled structures which are not convenient for fabrication of standard fracture mechanics specimens (such as elements of systems for transport and distribution of fluids -oxygen, hydrogen, nitrogen, water / steam, liquid and gaseous fuels, etc.).

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Section: Uvodunclassified

Određivanje otpornosti prema lomu materijala cevovoda primenom epruveta oblika prstena

Međo

Metallurgy

Musrati

et al. 2018

Proceedings of the 31st International Congress on Process Industry

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“…Specimen type used for this purpose is recently proposed as pipe ring notched bending specimen (PRNB) [28][29][30][31][32]. Regarding the axial defect position, which is critical in cylindrical geometries exposed to internal pressure, there are also some other proposed non-standard specimens (besides PRNB), such as curved compact tension (CCT) specimens [33], or several other configurations [34]. Unfortunately, all of the mentioned configurations require complex preparation or complex testing setup, tools, etc.…”

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confidence: 99%

Seam pipes for process industry-fracture analysis by using ring-shaped specimens

Musraty¹,

Medjo²,

Gubeljak

et al. 2018

Hem Ind

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Pipelines are commonly used in process industry for transport of fluids, as well as granular solids, due to their numerous advantages in comparison to other transportation means. Pipe integrity is essential for a reliable work of the entire plant, as well as for safety assurance. Also, serious ecological consequences may follow the pipeline failure in some cases, i.e. due to the leak of toxic, flammable or otherwise dangerous fluids in a chemical or some other plant. Therefore, it is very important to examine the fracture behaviour of pipelines, which is done here by testing the recently proposed ring-shaped specimens exposed to bending. The specimens were fabricated from a seam pipe for pressure applications (allowed for usage on temperatures up to 300 °C). Initial defects, very narrow notches, were machined either in the base metal and weld metal (seam) or in the base metal only. Regardless of the defect position, ductile fracture mechanism is observed in all specimens. The results show that the ring-shaped specimen can be successfully used for fracture characterisation of pipeline material, especially for thin-walled pipes which are not suitable for production of standard fracture mechanics specimens due to the insufficient wall thickness.

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A comparison of failure assessment diagram options for Inconel 690 and Incoloy 800 nuclear steam generators tubes

Bergant

Yawny

Ipiña

2020

Annals of Nuclear Energy

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Numerical study of the applicability of the η-factor method to J-resistance curve determination of steam generator tubes using non-standard specimens

Cited by 11 publications

References 22 publications

Određivanje otpornosti prema lomu materijala cevovoda primenom epruveta oblika prstena

Određivanje otpornosti prema lomu materijala cevovoda primenom epruveta oblika prstena

Seam pipes for process industry-fracture analysis by using ring-shaped specimens

A comparison of failure assessment diagram options for Inconel 690 and Incoloy 800 nuclear steam generators tubes

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