Use of Miniaturized Compact Tension Specimens for Fracture Toughness Measurements in the Upper Shelf Regime

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Use of Miniaturized Compact Tension Specimens for Fracture Toughness Measurements in the Upper Shelf Regime. / Lucon, Enrico; Scibetta, Marc; Chaouadi, Rachid; van Walle, Eric.

In: Journal of ASTM International, 19.10.2005, p. 1-16.

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@article{e38ea092e1aa48d680a0e663607565ab,
title = "Use of Miniaturized Compact Tension Specimens for Fracture Toughness Measurements in the Upper Shelf Regime",
abstract = "One of the most appealing geometries for fracture toughness measurements is the miniature Compact Tension specimen, MC(T), which has the following dimensions: B = 4.15 mm, W = 8.3 mm, cross section 10 × 10 mm2. Four MC(T) specimens can be machined out of a broken half Charpy, and in the case of irradiation ten MC(T) samples occupy approximately the same volume as a full-size Charpy specimen. A comprehensive investigation is presented in this paper, aimed at assessing the applicability of MC(T) specimens to measure fracture toughness in fully ductile (upper shelf) conditions. In this study, 18 1TC(T) and 20 MC(T) specimens have been tested at different temperatures from three RPV steels and one low-alloy C-Mn steel. The results obtained clearly show that MC(T) samples exhibit lower fracture toughness properties, both in terms of initiation of ductile tearing (according to various test standards) and resistance to ductile crack propagation (J-R curve). The reduction of tearing resistance might be attributed to work hardening prevailing over loss of constraint in the uncracked ligament for a side-grooved specimen, or to the inadequacy of J-integral to represent ductile crack extension in very small specimens. Both arguments need to be verified with further investigations.",
keywords = "ductile fracture toughness measurement, ductile tearing initiation, fracture toughness, J-R curve, loss of constraint, miniature compact tension specimen, work hardening",
author = "Enrico Lucon and Marc Scibetta and Rachid Chaouadi and {van Walle}, Eric",
note = "Score = 10",
year = "2005",
month = oct,
day = "19",
doi = "10.1520/JAI13235",
language = "English",
pages = "1--16",
journal = "Journal of ASTM International",
issn = "1546-962X",
publisher = "ASTM International",

}

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TY - JOUR

T1 - Use of Miniaturized Compact Tension Specimens for Fracture Toughness Measurements in the Upper Shelf Regime

AU - Lucon, Enrico

AU - Scibetta, Marc

AU - Chaouadi, Rachid

AU - van Walle, Eric

N1 - Score = 10

PY - 2005/10/19

Y1 - 2005/10/19

N2 - One of the most appealing geometries for fracture toughness measurements is the miniature Compact Tension specimen, MC(T), which has the following dimensions: B = 4.15 mm, W = 8.3 mm, cross section 10 × 10 mm2. Four MC(T) specimens can be machined out of a broken half Charpy, and in the case of irradiation ten MC(T) samples occupy approximately the same volume as a full-size Charpy specimen. A comprehensive investigation is presented in this paper, aimed at assessing the applicability of MC(T) specimens to measure fracture toughness in fully ductile (upper shelf) conditions. In this study, 18 1TC(T) and 20 MC(T) specimens have been tested at different temperatures from three RPV steels and one low-alloy C-Mn steel. The results obtained clearly show that MC(T) samples exhibit lower fracture toughness properties, both in terms of initiation of ductile tearing (according to various test standards) and resistance to ductile crack propagation (J-R curve). The reduction of tearing resistance might be attributed to work hardening prevailing over loss of constraint in the uncracked ligament for a side-grooved specimen, or to the inadequacy of J-integral to represent ductile crack extension in very small specimens. Both arguments need to be verified with further investigations.

AB - One of the most appealing geometries for fracture toughness measurements is the miniature Compact Tension specimen, MC(T), which has the following dimensions: B = 4.15 mm, W = 8.3 mm, cross section 10 × 10 mm2. Four MC(T) specimens can be machined out of a broken half Charpy, and in the case of irradiation ten MC(T) samples occupy approximately the same volume as a full-size Charpy specimen. A comprehensive investigation is presented in this paper, aimed at assessing the applicability of MC(T) specimens to measure fracture toughness in fully ductile (upper shelf) conditions. In this study, 18 1TC(T) and 20 MC(T) specimens have been tested at different temperatures from three RPV steels and one low-alloy C-Mn steel. The results obtained clearly show that MC(T) samples exhibit lower fracture toughness properties, both in terms of initiation of ductile tearing (according to various test standards) and resistance to ductile crack propagation (J-R curve). The reduction of tearing resistance might be attributed to work hardening prevailing over loss of constraint in the uncracked ligament for a side-grooved specimen, or to the inadequacy of J-integral to represent ductile crack extension in very small specimens. Both arguments need to be verified with further investigations.

KW - ductile fracture toughness measurement

KW - ductile tearing initiation

KW - fracture toughness

KW - J-R curve

KW - loss of constraint

KW - miniature compact tension specimen

KW - work hardening

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/ezp_32193

UR - http://knowledgecentre.sckcen.be/so2/bibref/3609

U2 - 10.1520/JAI13235

DO - 10.1520/JAI13235

M3 - Article

SP - 1

EP - 16

JO - Journal of ASTM International

JF - Journal of ASTM International

SN - 1546-962X

ER -

ID: 276656