Towards Crack Arrest Testing Using Miniature Specimens

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Towards Crack Arrest Testing Using Miniature Specimens. / Scibetta, Marc; Link, Richard; Schuurmans, Johan; Lucon, Enrico.

In: Journal of ASTM International, Vol. 5, No. 9, 10.2008, p. 1-15.

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Scibetta, Marc ; Link, Richard ; Schuurmans, Johan ; Lucon, Enrico. / Towards Crack Arrest Testing Using Miniature Specimens. In: Journal of ASTM International. 2008 ; Vol. 5, No. 9. pp. 1-15.

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@article{f43905112b884dd89d603a4a2fb86d0a,
title = "Towards Crack Arrest Testing Using Miniature Specimens",
abstract = "Crack arrest is an important concept that can be useful to guarantee the safety of reactor pressure vessels. In case of a pressurized thermal shock, a postulated crack can initiate and arrest due to a decrease in driving force combined with an increase in material toughness due to the thermal and neutron embrittlement gradient along the thickness. Due to the size of the specimen and the difficulty in obtaining valid results according to the ASTM E1221-06 standard, “Standard Test Method for Determining Plane-Strain Crack-Arrest Fracture Toughness, KIa, of Ferritic Steels,” current efforts to develop this technique for irradiated materials are very limited. However, advances in dynamic fracture modeling and elastic-plastic fracture mechanics open the possibility of using miniature crack arrest specimens. We have developed a stiff setup to perform crack arrest tests on precracked Charpy PCCv specimens. Different strategies were evaluated to provide enough reduction in driving force to produce arrest. Special attention is given to the starter notch and different starter notch preparations are investigated: precracking, chevron, and brittle weld. Testing configurations were found that guarantee crack arrest with sufficient remaining ligament.",
keywords = "crack arrest, PCCv, starter notch, finite element calculations",
author = "Marc Scibetta and Richard Link and Johan Schuurmans and Enrico Lucon",
note = "Score = 10",
year = "2008",
month = oct,
doi = "10.1520/JAI101002",
language = "English",
volume = "5",
pages = "1--15",
journal = "Journal of ASTM International",
issn = "1546-962X",
publisher = "ASTM International",
number = "9",

}

RIS - Download

TY - JOUR

T1 - Towards Crack Arrest Testing Using Miniature Specimens

AU - Scibetta, Marc

AU - Link, Richard

AU - Schuurmans, Johan

AU - Lucon, Enrico

N1 - Score = 10

PY - 2008/10

Y1 - 2008/10

N2 - Crack arrest is an important concept that can be useful to guarantee the safety of reactor pressure vessels. In case of a pressurized thermal shock, a postulated crack can initiate and arrest due to a decrease in driving force combined with an increase in material toughness due to the thermal and neutron embrittlement gradient along the thickness. Due to the size of the specimen and the difficulty in obtaining valid results according to the ASTM E1221-06 standard, “Standard Test Method for Determining Plane-Strain Crack-Arrest Fracture Toughness, KIa, of Ferritic Steels,” current efforts to develop this technique for irradiated materials are very limited. However, advances in dynamic fracture modeling and elastic-plastic fracture mechanics open the possibility of using miniature crack arrest specimens. We have developed a stiff setup to perform crack arrest tests on precracked Charpy PCCv specimens. Different strategies were evaluated to provide enough reduction in driving force to produce arrest. Special attention is given to the starter notch and different starter notch preparations are investigated: precracking, chevron, and brittle weld. Testing configurations were found that guarantee crack arrest with sufficient remaining ligament.

AB - Crack arrest is an important concept that can be useful to guarantee the safety of reactor pressure vessels. In case of a pressurized thermal shock, a postulated crack can initiate and arrest due to a decrease in driving force combined with an increase in material toughness due to the thermal and neutron embrittlement gradient along the thickness. Due to the size of the specimen and the difficulty in obtaining valid results according to the ASTM E1221-06 standard, “Standard Test Method for Determining Plane-Strain Crack-Arrest Fracture Toughness, KIa, of Ferritic Steels,” current efforts to develop this technique for irradiated materials are very limited. However, advances in dynamic fracture modeling and elastic-plastic fracture mechanics open the possibility of using miniature crack arrest specimens. We have developed a stiff setup to perform crack arrest tests on precracked Charpy PCCv specimens. Different strategies were evaluated to provide enough reduction in driving force to produce arrest. Special attention is given to the starter notch and different starter notch preparations are investigated: precracking, chevron, and brittle weld. Testing configurations were found that guarantee crack arrest with sufficient remaining ligament.

KW - crack arrest

KW - PCCv

KW - starter notch

KW - finite element calculations

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/ezp_92536

UR - http://knowledgecentre.sckcen.be/so2/bibref/5298

U2 - 10.1520/JAI101002

DO - 10.1520/JAI101002

M3 - Article

VL - 5

SP - 1

EP - 15

JO - Journal of ASTM International

JF - Journal of ASTM International

SN - 1546-962X

IS - 9

ER -

ID: 73633