Academic literature on the topic 'J-R curve'

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Journal articles on the topic "J-R curve"

1

Zhu, Xian-Kui, and Brian N. Leis. "Application of Constraint Corrected J-R Curves to Fracture Analysis of Pipelines." Journal of Pressure Vessel Technology 128, no. 4 (2005): 581–89. http://dx.doi.org/10.1115/1.2349571.

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Fracture properties of an API X80 pipeline steel have been developed using a set of single edge notched bend (SENB) and single edge notched tension (SENT) specimens with shallow and deep cracks to generate different crack-tip constraint levels. The test data show that the J-R curves for the X80 pipeline steel are strongly constraint dependent. To facilitate transfer of the experimental J-R curves to those for actual cracked components, like flawed pipeline, constraint corrected J-R curves are developed. The two-parameter J-A2 formulation is adopted to quantify constraint effect on the crack-tip fields and the J-R curves. The constraint parameter A2 is extracted by matching the J-A2 solution with finite element results for a specific crack configuration. A constraint corrected J-R curve is then formulated as a function of the constraint parameter A2 and crack extension Δa. A general method and procedure to transfer the experimentalJ-R curves from laboratory to actual cracked components are proposed. Using the test data of J-R curves for the SENB specimens, a mathematical expression representing a family of the J-R curves is constructed for the X80. It is shown that the predicted J-R curves developed in this paper agree well with experimental data for both SENB and SENT specimens. To demonstrate its application in assessing flaw instability, a pipeline with an axial surface crack is considered. For a crack depth of 50% of the wall thickness, the predicted J-R curve is found to be higher than that for the SENB specimen with the same crack length to width ratio. From this predicted J-R curve and crack driving force obtained by finite element analysis, the failure pressures of the pipeline at the crack initiation and instability are determined and discussed.
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2

Wallin, Kim, and Anssi Laukkanen. "Improved crack growth corrections for J–R-curve testing." Engineering Fracture Mechanics 71, no. 11 (2004): 1601–14. http://dx.doi.org/10.1016/s0013-7944(03)00165-6.

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3

Saxena, Ashok, and Laurent Cretegny. "The relationship between microstructure and the J-R curve." Metallurgical and Materials Transactions A 29, no. 7 (1998): 1917–22. http://dx.doi.org/10.1007/s11661-998-0016-2.

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4

Lam, P. S., Y. J. Chao, X. K. Zhu, Y. Kim, and R. L. Sindelar. "Determination of Constraint-Modified J-R Curves for Carbon Steel Storage Tanks." Journal of Pressure Vessel Technology 125, no. 2 (2003): 136–43. http://dx.doi.org/10.1115/1.1564069.

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Mechanical testing of A285 carbon steel, a storage tank material, was performed to develop fracture properties based on the constraint theory of fracture mechanics. A series of single edge-notched bend (SENB) specimen designs with various levels of crack tip constraint were used. The variation of crack tip constraint was achieved by changing the ratio of the initial crack length to the specimen depth. The test data show that the J-R curves are specimen-design-dependent, which is known as the constraint effect. A two-parameter fracture methodology is adopted to construct a constraint-modified J-R curve, which is a function of the constraint parameter, A2, while J remains the loading parameter. This additional fracture parameter is derived from a closed form solution and can be extracted from the finite element analysis for a specific crack configuration. Using this set of SENB test data, a mathematical expression representing a family of the J-R curves for A285 carbon steel can be developed. It is shown that the predicted J-Rcurves match well with the SENB data over an extensive amount of crack growth. In addition, this expression is used to predict the J-R curve of a compact tension specimen (CT), and reasonable agreement to the actual test data is achieved. To demonstrate its application in a flaw stability evaluation, the configuration of a generic A285 storage tank with a postulated axial flaw is used. For a flaw length of 10% of the tank height, the predicted J-R curve is found to be similar to that for a SENB specimen with a short notch, which is in a state of low constraint. This implies that the use of a J-R curve from the ASTM (American Society for Testing and Materials) standard designs, which typically are high-constraint specimens, may be overly conservative for analysis of fracture resistance of large structures.
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5

Wolfenden, A., R. Herrera, and JD Landes. "A Direct J-R Curve Analysis of Fracture Toughness Tests." Journal of Testing and Evaluation 16, no. 5 (1988): 427. http://dx.doi.org/10.1520/jte11618j.

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6

Jones, R. L., J. R. Gordon, and N. V. Challenger. "A STUDY OF SPECIMEN SIZE ON J-R CURVE BEHAVIOUR." Fatigue & Fracture of Engineering Materials and Structures 14, no. 7 (1991): 777–88. http://dx.doi.org/10.1111/j.1460-2695.1991.tb00706.x.

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7

Menezes, João Teixeira Oliveira de, Juan E. Perez Ipiña, and Enrique M. Castrodeza. "Normalization method for J-R curve determination using SENT specimens." Engineering Fracture Mechanics 199 (August 2018): 658–71. http://dx.doi.org/10.1016/j.engfracmech.2018.06.033.

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8

Sahu, MK, J. Chattopadhyay, and BK Dutta. "Hybrid approach for calculation of J-R curve using R6." Engineering Fracture Mechanics 215 (June 2019): 16–35. http://dx.doi.org/10.1016/j.engfracmech.2019.04.031.

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9

Liu, Zheng, Xin Wang, and Xu Chen. "J-Resistance Curve Testing Using Modified Normalization Method for SENT Specimens." Key Engineering Materials 795 (March 2019): 367–74. http://dx.doi.org/10.4028/www.scientific.net/kem.795.367.

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A modified normalization (NM) method to determine J-R curves using clamped single edge notched tension (SENT) specimens was proposed. To validate and quantify the modified NM method, the J-R curves of X80 pipeline steel obtained by NM method are compared with those determined by the unloading compliance (UC) method for SENT specimens. The comparison shows that modified NM method is obvious better than unmodified NM method for SENT specimens. The modified NM method has great agreements with UC method, and is a valid and cost-effective tool to be applied to obtain J-R curves of API X80 steel using SENT specimens with shallow cracked depth to deep cracked depth.
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10

Kumar, Pradeep, B. K. Dutta, J. Chattopadhyay, and R. S. Shriwastaw. "Numerical evaluation of J-R curve using small punch test data." Theoretical and Applied Fracture Mechanics 86 (December 2016): 292–300. http://dx.doi.org/10.1016/j.tafmec.2016.08.003.

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