Experience with the Use of the New ASTM E 813-87

Sluys, WA Van Der; Wade, CS

doi:10.1520/stp16844s

Cited by 2 publications

(5 citation statements)

References 6 publications

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“…The slope of the fitted equation approaches fast to zero 15 . It is reported that the Eason's equation yields the best results for fitting J – R curves and predicting the results for large specimens from small specimens 41 . However, its relationship is complex and hence it is not investigated in this paper.…”

Section: Extrapolation Of Specimen J–r Curvementioning

confidence: 99%

“…However, it does not force the fit to asymptotically approach some minimum d J /dΔ a curve at large crack extensions. It is also reported that the extrapolation of data of different specimen sizes produce inconsistent trend and it may not allow for accurate prediction of the response of a large specimen using data from a small specimen 41 . The polynomial fit also fits the J – R curve well, however it is not suitable for the prediction of larger crack extension.…”

Section: Extrapolation Of Specimen J–r Curvementioning

confidence: 99%

“…It is known that the two‐parameter power law fit () does not adequately describe the specimen J – R curve. However, it is simple and can predict the large specimen results 41 . In the present investigation the three‐parameter power law is fitted for the specimen J – R curve.…”

Section: Extrapolation Of Specimen J–r Curvementioning

confidence: 99%

“…15 It is reported that the Eason's equation yields the best results for fitting J-R curves and predicting the results for large specimens from small specimens. 41 However, its relationship is complex and hence it is not investigated in this paper. It is known that the two-parameter power law fit (13) does not adequately describe the specimen J-R curve.…”

Section: J-r Curve Fit Equationmentioning

confidence: 99%

“…However, it is simple and can predict the large specimen results. 41 In the present investigation the three-parameter power law is fitted for the specimen J-R curve. As may be seen, it fits the J-R curve quite well (Fig.…”

Section: J-r Curve Fit Equationmentioning

confidence: 99%

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On the transfer of specimen J–R curve to piping components with throughwall circumferential flaw

Pavankumar¹,

Chattopadhyay²,

Dutta³

et al. 2005

Fatigue Fract Eng Mat Struct

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A B S T R A C T Transferability of the specimen J-R/J-T curve to the component level is an importantissue in the field of fracture mechanics. Towards this goal, fracture experiments have been carried out on single-edge bend (SE(B)) and compact tension (CT) specimens and throughwall circumferentially cracked straight pipes/elbows of 200 mm nominal bore (NB) diameter. The pipe material is SA 333 Gr 6 steel (low strength and high toughness material) and specimens are machined from the pipes. Subsequently, elastic-plastic finiteelement analyses have been carried out on these cracked components/specimens in order to evaluate the stress triaxiality levels. It is found that the triaxial levels for these cracked components are similar. Hence, similar fracture behaviour is expected for these components. Consequently, one of the pipe J-R curves is used as a reference J-R curve to consider the crack growth in the analysis and the load deformation behaviour of other pipes/elbows is predicted. The load deformation behaviour of the piping components is also predicted using an extrapolated J-R curve from a specimen that exhibits the similar triaxiality level to that of the cracked components. The predicted results are in good agreement with the experiments.Keywords J-R curve; multiaxiality quotient; stress triaxiality; tearing modulus. N O M E N C L A T U R Ea = crack length a 0 = initial crack length b = ligament length B = thickness of the specimen B N = net thickness of the specimen after side grooving E = Young's modulus of elasticity h = stress triaxiality parameter, see Eq.(2) J = J-integral J iC = initiation toughness (J i ) SZW = initiation toughness obtained using ESIS-P2-92 standard J-R = resistance curve J-T = J-integral-tearing modulus approach n = Ramberg-Osgood power exponent Q = Q-stress T = T-stress W = specimen width for SE(B) and CT specimens α = constant in Ramberg-Osgood constitutive equation η = a function to multiply the area under load versus load point deflection curve to get the J-integral Correspondence:

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Section: Extrapolation Of Specimen J–r Curvementioning

confidence: 99%

Section: Extrapolation Of Specimen J–r Curvementioning

confidence: 99%

Section: Extrapolation Of Specimen J–r Curvementioning

confidence: 99%

Section: J-r Curve Fit Equationmentioning

confidence: 99%

Section: J-r Curve Fit Equationmentioning

confidence: 99%

See 3 more Smart Citations

On the transfer of specimen J–R curve to piping components with throughwall circumferential flaw

Pavankumar¹,

Chattopadhyay²,

Dutta³

et al. 2005

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

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Fracture Toughness Test Results of Thermal Aged Reactor Vessel Materials

DeVan¹,

Lowe²,

Hall

1996

Effects of Radiation on Materials: 17th International Symposium

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Thermal-aged surveillance materials consisting of SA-533, Grade B, Class 1 plate material; SA-508, Class 2 forging material; and 2 Mn-Mo-Ni/Linde 80 weld metals were removed from two commercial reactor pressure vessels. The material from the first reactor vessel received a thermal exposure of approximately 103,000 hours at 282°C (540°F), while the material from the second reactor vessel received a thermal exposure of approximately 93,000 hours at 282°C (540°F). Tensile and 1/2T compact fracture toughness specimens were fabricated from these materials and tested. In addition, to examine the effects of annealing, selected thermal-aged and unaged specimens were annealed at 454°C (850°F) and tested. Varying responses in the fracture toughness properties were observed for all materials after exposure to the thermal-aging temperature. The base metal plate had an observed decrease in J-values after its respective aging exposure, while no significant difference in the J-values were observed for the Linde 80 weld metals. No significant difference was seen in the J-data for the aged/annealed materials, but because of the small number of test specimens available, no conclusion could be determined for the response to annealing.

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Experience with the Use of the New ASTM E 813-87

Cited by 2 publications

References 6 publications

On the transfer of specimen J–R curve to piping components with throughwall circumferential flaw

On the transfer of specimen J–R curve to piping components with throughwall circumferential flaw

Fracture Toughness Test Results of Thermal Aged Reactor Vessel Materials

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