Determination of constraint limits for cleavage initiated toughness data

Joyce, JA; Tregoning, Robert L.

doi:10.1016/j.engfracmech.2004.11.001

Cited by 23 publications

(17 citation statements)

References 19 publications

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“…(58) to define K Jc(limit) for C(T), SE(B) and precracked Charpy specimen geometries. However, Joyce and Tregoning [198] showed that this single limit is likely to result in specimen geometry-dependent estimates of the master curve reference temperature T 0 . These authors suggested that M limit = 30 be adequate for the compact specimen, but M limit = 150 should be required for the bend specimen.…”

Section: Astm E1921 Developmentmentioning

confidence: 99%

“…Based on this model, Shih et al [285] determined the J c -Q relationship for cleavage fracture, Chao and Ji [278] obtained the K c -T relationship for brittle fracture, and Chao and Zhang [286] obtained the J c À A 2 relationship for cleavage fracture. Since the T-stress concept is based on the elastic K field, and thus it is adequate to use T to quantify the constraint effect on cleav-age fracture toughness in ductile-to-brittle transition, as demonstrated by Joyce and Tregoning [198], Gao and Dodds [287], Wallin [288] and Huh et al [289].…”

Section: Constraint Correction Approachesmentioning

confidence: 99%

See 1 more Smart Citation

Review of fracture toughness (G, K, J, CTOD, CTOA) testing and standardization

Zhu

Joyce

2012

Engineering Fracture Mechanics

604

126

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Stress intensity factor Energy release rate CTOD CTOA J-integral J-R curve K-R curve ASTM standard a b s t r a c tThe present paper gives a technical review of fracture toughness testing, evaluation and standardization for metallic materials in terms of the linear elastic fracture mechanics as well as the elastic-plastic fracture mechanics. This includes the early investigations and recent advances of fracture toughness test methods and practices developed by American Society for Testing and Materials (ASTM). The review describes the most important fracture mechanics parameters: the elastic energy release rate G, the stress intensity factor K, the Jintegral, the crack-tip opening displacement (CTOD) and the crack-tip opening angle (CTOA) from the basic concept, definition, to experimental estimation, test methods and ASTM standardizing practices. Attention is paid to guidelines on how to choose an appropriate fracture parameter to characterize fracture toughness for the material of interest, and how to measure the fracture toughness value defined either at a critical point or in a resistance curve format using laboratory specimens. The relevant ASTM fracture toughness test standards considered in this paper are E399 for K Ic testing, E561 for K-R curve testing, E813 for J Ic testing, E1152 for J-R curve testing, E1737 for J Ic and J-R curve testing, E1290 for CTOD (d) testing, a combined common test standard E1820 for measuring the three parameters of K, J and d, E1921 for the transition reference temperature T 0 testing and the master curve of cleavage toughness K Jc testing, and E2472 for CTOA testing. The effects of loading rate, temperature and crack-tip constraint on fracture toughness as well as fracture instability analysis are also reviewed.

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Section: Astm E1921 Developmentmentioning

confidence: 99%

Section: Constraint Correction Approachesmentioning

confidence: 99%

Review of fracture toughness (G, K, J, CTOD, CTOA) testing and standardization

Zhu

Joyce

2012

Engineering Fracture Mechanics

604

126

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“…Two recent studies were performed on reactor pressure vessel steels to re-assess the size limit for cleavage toughness as stated in the ASTM E1921 standard [11,12]. In both investigations, it was shown that the ASTM E1921 size limit is too lenient, resulting in early constraint loss that in turn leads to non-conservative estimates of T o .…”

Section: Introductionmentioning

confidence: 99%

3D finite element and experimental study of the size requirements for measuring toughness on tempered martensitic steels

Mueller¹,

Spätig²

2009

Journal of Nuclear Materials

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The fracture properties of the tempered martensitic steel Eurofer97, which is among the main candidates for fusion power plant structural applications, were studied with two sizes of pre-cracked compact specimens (0.35T C(T) and 0.87T C(T)). The fracture toughness behavior was characterized within the temperature range -80 to -40 ºC. The ductile-to-brittle transition reference temperature, as defined in the ASTM standard E1921, was around T 0 ≈ -75 ºC. At -60 °C, it was found that two sets of toughness data obtained with 0.35T and 0.87T C(T) specimens are not consistent with the size adjustments recommended in the ASTM standard. It was then shown that the underlying reason of this inconsistency is an inappropriate specimen size limit of the ASTM standard for this type of steel. From published fracture toughness data on the tempered martensitic steel F82H steel, similar results were also highlighted. 3D finite elements simulations of the compact specimens were performed to compare the stresses and deformations at the onset of fracture. A local approach model based on the attainment of a critical stress and a critical volume was used to study the constraint loss phenomenon. Within the framework of this model, the strong toughness increase by reducing the specimen size could be satisfactorily explained.2

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“…1 and show the temperature dependence of fracture toughness in the lower transition region without any type of correction (neither statistical nor constraint loss). Two K j c limits associated with two constraint levels as defined by the M factor [5] are also indicated (for M = 30 and M = 70):…”

Section: Resultsmentioning

confidence: 99%

“…For the sake of comparison, we have only considered C(T) data, which have been analyzed by using the ASTM E 1921 standard, substituting the mastercurve expression by Eq. (5). The reference temperature T 0 for these plates was determined using the multi-temperature approach and a value equal to 161 K was found.…”

Section: Resultsmentioning

confidence: 99%